By Maurice. Collignon

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Additional resources for Ammonites néocrétacées du Menabe (Madagascar). IV. Les Phylloceratidae. V. Les Gaudryceratidae. VI. Les Tetragonitidae

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Z ;;... , '-\ 'B I 1� J.. - INTRODUCTION CHAPITRE 1. - • • • • • • • • 0 • • • • l ) J� S � � - · • • • • • • • • • • • • • 0 • • 1\ I J\ rr i E ll�� S " • • • 0 • • • • 0 • • • • • • • • • • • • • • • • • • 0 • • • • • • • • • • • • Les familles et les genres des Phyllocera tidae (au-dessus du Cénomanien). . . . CHAPITRE Il. - Description des espèces. . . . . . . . . . . . . . . . . . . . . . Genre Phylloceras SUEss 1854, 1865 . . . . . . . . . . .

U dryceras utat uren s : SH IM. a , qgure l la est inter médi aire avec sa secti On eleve e, fi � ' entre l'avant-dernier tour bas et l e d erni. � r tour 3 fois plus haut de la figure 2, 2a. I l est vrai �u ' on ne pourrait absolum ent le démontrer qu'en demon­ tant un A nagaudryceras utaturen se pour retrouve r les stades ultérieurs. J'en conclus que si on considère G. Sacya FoRBES et G. Sacya SToL. var. multiplexa comm� d� bonnes espèces, il est dangereux de leur assimiler tant d ' a utre s Gaudryceras non évolués si l'on n'en connaît pas les adultes.

Pl. V, fig. l, l a, 2, 2a, 2b, 0, 3a, 3 b ) ( l ï OU) . . 11 E. . . . . . . . . . . . . O,OOü O , U O l (0, 1 i) 0,0025 (O, 'J O ) 0 , 0 0 2 (0,33) 0,40 G i s t. 311t1 A n al abe (lï0 1 ) ( l ï Ul1) 0 ,028 0 , 0 l 0 ( 0 , 3ü) 0 , 0 I l ( 0 , 3 9) 0 , 0 1 2 ( 0 , '1 3 ) 0,9 1 O,OC>9 0,02� ( O, 't 2) 0,023 ( 0 , 3 9) 0 , 0 2 0 (0 , 3 (1) 1 , 08 G i s t. 3 3 5 Jusqu'au diamètre de 50 à 60 millimètres les tours sont au stade Sacya c'est-à-dire plus épais que hauts ; ce n'est que vers le diamètre de 40 milli­ mètres que la hauteur égale l'épaisseur, puis la dépasse.

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