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Ces deux types morphologiques semblent en rapport avec des troubles du m é t a b o l i s m e . Ces formes ne seraient que des rameaux d é g é n é r é s de la famille r e p r é s e n t é e dans les niveaux i n f é r i e u r s , qui auraient s u r v é c u aux bouleversements du fond sur lequel elles vivaient, qui se d é v e l o p p e r a i e n t nouveau milieu et qui préluderaient à l'élimination de la famille à c ô t é des e s p è c e s par concurrence bien a d a p t é e s au vitale. S'il s'agissait de di- morphisme sexuel, on ne voit pas pourquoi les m â l e s (ou l'un des sexes) ne seraient r e p r é s e n t é s que dans certaines populations et par des formes dont Encore faudrait-il a c q u é r i r le d é v e l o p p e m e n t ne pouvait conduire q u ' à la disparition la certitude que les sexes é t a i e n t blable que le dimorphisme, s'il existe, est m a r q u é séparés du rameau.

Die Ursache, vermutlich ö k o l o g i s c h , bedingt, ist allerdings unbekannt. Einzelne Arten leben an verschiedenen Orten oft unterschiedlich lange. Das wird durch ihre ö k o l o g i s c h e A b h ä n g i g k e i t v e r s t ä n d l i c h , obwohl die G r ü n d e im einzelnen Fall schwierig zu erkennen sind. Aulacostephanus volgensis (Fig. 9) kommt in England in der eudoxusund autissiodorensis-Zone des K i m m é r i d g i e n vor. In Polen ist er nur in der autissiodorensis-Zone nachgewiesen.

1856-1858). — Die Juraformation Englands, Frankreichs und des s ü d w e s t l i c h e n Deutschlands. Naturw. Jahr. Jarhg. -t. OPPEL A. (1862-1863). - Uber jurassische Cephalopoden. Pal. Mitt. 1 6 2 ; IV (1863), pp. 163-266 ; pl. 40-74. OPPEL A. ( 1 8 6 5 ) . - Die tithonische Etage. Z. Dtsch. Geol. , Mus. Kg. Bayer. Staates, III (1862), pp. 127- XVII, pp. 5 3 5 - 5 5 8 . ORBIGNY A. D' (1840-1842). — P a l é o n t o l o g i e f r a n ç a i s e . Terrains c r é t a c é s . Céphalopodes. texte 662 p.

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Colloque du Jurassique à Luxembourg 1967

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