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  • scalenohedric forms
    HERE or click the back button of your browser Third Species of the Scalenoidea Scalenoidea trimera Trigonal Trapezohedron The Scalenoidea trimera are based on geometric bodies called Trigonal Trapezohedra The symmetry content of such bodies is 3 2 which corresponds to the Trigonal trapezohedric Crystal Class of the Hexagonal Crystal System See for details and Figures HERE When you came from the document treating of the Promorphology of Crystals and when you want to go back to it click HERE or click the back button of your browser Fourth Species of the Scalenoidea Scalenoidea rhomboedra Rhombohedron The Scalenoidea rhomboedra are based on geometric bodies called Rhombohedra The symmetry content of such bodies is 3 2 m which corresponds to the Ditrigonal scalenohedric Crystal Class of the Hexagonal Crystal System The Rhombohedron can be viewed as a more or less pyramidal form consisting of three antimers each involving two of its faces grouped around the main axis To obtain a rhombohedron one can deform a cube in the direction of one of the axes of 3 fold rotoinversion i e one of the axes that run through two of the cube s opposite corners vertices See for details and Figures HERE When you came from the document treating of the Promorphology of Crystals and when you want to go back to it click HERE or click the back button of your browser Fifth Species of the Scalenoidea Scalenoidea duomera Rhombic Bisphenoid The Scalenoidea duomera are based on geometric bodies called Rhombic Bisphenoids or Rhombic Tetrahedra The symmetry content of such bodies is 2 2 2 which corresponds to the Rhombic bisphenoidic Crystal Class of the Orthorhombic Crystal System The Rhombic Bisphenoid can be viewed as a more or less pyramidal form consisting of two antimers each involving two of its faces

    Original URL path: http://www.metafysica.nl/turing/scaleno.html (2016-02-01)
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  • pseudo bisphenoid
    pyramids are rotated by 90 0 with respect to each other No organisms having this basic form are recorded For more details and Figures see HERE When you just came from the document on the Promorphology of Crystals and when you want to go back to it click HERE To proceed further with the systematic Promorphology scroll the main frame further down This website consists of two Main Parts Presently

    Original URL path: http://www.metafysica.nl/turing/pseudo_bisphenoid.html (2016-02-01)
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  • Octactinota
    in Handwörterbuch der Naturwissenschaften 1912 To see the inclination towards the Allopola octamphipleura see the next Figure The overall slight irregularity of the general outline of the animal as is visible in this and the previous Figure is extrinsic and falls outside the promorphological consideration The irregularity of the arrangement of the soft parts along the sides and apex of the skeletal part of the septa is constant and thus intrinsic and represents the inclination towards the octamphipleural form Figure 2 Arrrangement of septa in Octocorallia cross section as taken from the previous Figure If we take the configuration of the soft parts into consideration then the only mirror plane possessed by the coral is the line a e The line g c does not represent a mirror plane This line and the line a e represent the directional axes There are still eight antimers indicated respectively by a b b c c d d e e f f g g h h a Thus as such the basic form of the body belongs to the Allopola octamphipleura Figure 3 Red Coral Corallium rubrum Octocorallia Anthozoa The individual polypes are visible associated with the red skeleton of the colony After KILIAS R 1971 in Neue grosse Tier enzyklopädie Figure 4 Transverse section through an octocorallium Alcyonium The septa of one side are exactly symmetrically ordered to those of the other side and all of them bearing the muscle flags on the same side i e on the dorsal side of each septum ek ectoderm en entoderm s gullet m intermediate lamella After HERTWIG R 1907 Lehrbuch der Zoologie In all Anthozoa corals sea anemones octocorallia gorgonians sea pens the mouth is not just a simple aperture of the gastral cavity but runs into the stomach by an ectodermal gullet which

    Original URL path: http://www.metafysica.nl/turing/octactinota.html (2016-02-01)
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  • Oxystaura hexaphragma
    R 1907 Lehrbuch der Zoologie The next three Figures depict the successive formation of septa in different hexacorallia Figure 3 Initial four pairs of septa After MAAS O 1912 in Handwörterbuch der Naturwissenschaften Figure 4 In addition to the four pairs a fifth and sixth pair have appeared After MAAS O 1912 in Handwörterbuch der Naturwissenschaften Figure 5 The six pairs of septa fully developed Still more septa are being added After MAAS O 1912 in Handwörterbuch der Naturwissenschaften In Figure 5 we see that in Hexacorallia still more septa are formed after the first six pairs have been laid down Further it is known that also the number of tentacles more and more increases While in the Octocorallia the number of septa does not after the four pairs have been initiated more or less simultaneously exceed the number 8 in the Hexacorallia the initial pairs of septa are not laid down simultaneously but after each other in a definite order Before the number of six pairs is reached also a stadium of four pairs appears which although displaying a somewhat different ordering of the muscles could be compared with the Octocorallia MAAS O 1912 in Handwörterbuch der Naturwissenschaften Volume II p 685 6 The next Figure is the same as Figure 5 but shows the approximate boundaries of the six antimers Figure 5a The s i x a n t i m e r s are outlined in the image of Figure 5 Strictly there are only two mirror planes We can indicate them by two lines intersecting each other at right angles in the center of the section through the coral and lying in the plane of the drawing one horizontally the other vertically These two lines are the directional axes directional cross axes and are not equivalent

    Original URL path: http://www.metafysica.nl/turing/hexaphragma.html (2016-02-01)
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  • Eutetrapleura interradialia
    Figure 2a The same as above The four a n t i m e r s are indicated by colors The upper left and right antimers are symmetrically equal they differ from the lower left and right antimers which are also symmetrically equal The directional axes are interradial The main axis of the coral is heteropolar So the b a s i c f o r m of the coral is that of the Eutetrapleura interradialia The situation in the above Figure concerning septal emplacement in Tetracorallia is such that the second directional axis and also the directional plane in which it is contained i e the left right axis is bent This is however immaterial and we interpret this configuration according to the next Figure Figure 2b Promorphological assessment of the situation regarding Tetracorallia of Figure 2a Depicted is the base of the trapezoid pyramid representing the Eutetrapleura interradialia Four antimers The directional axes represented by red straight lines are interradial When the rugose coral Amplexizaphrentis See especially Figure 1 is very young a single proseptum i e a primary septum divides it soon becoming separated into cardinal C and counter K prosepta Two other of prosepta follow the alar A adjacent to the cardinal septum and the counter lateral KL 3 in Figure 2 and 2a Even at this stage some bilaterality is evident which becomes more pronounced when the metasepta secondary septa are inserted in four quadrants only on the cardinal side of the alar and counter lateral septa Through differential growth the counter lateral and alar septa move towards the counter septum to make room for new metasepta Eventually when more metasepta have been inserted short minor septa second order metasepta are laid down between the first order metasepta Around the cardinal septum there is a

    Original URL path: http://www.metafysica.nl/turing/tetrapleura_inter.html (2016-02-01)
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  • Kevers
    the Plane Group Pm After BURZLAFF H THIELE G 1977 Kristallographie Band I Symmetrielehre back to the third part of the Preparation to the Promorphology of Crystals back to homepage

    Original URL path: http://www.metafysica.nl/turing/kevers.html (2016-02-01)
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  • gen_ont_29c
    back to main text

    Original URL path: http://www.metafysica.nl/ontology/gen_ont_29c_1.html (2016-02-01)
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  • snowflake 34a 35a

    (No additional info available in detailed archive for this subpage)
    Original URL path: /ontology/gen_ont_29f_snowflake.html (2016-02-01)




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