CEPHALOPODA. 



199 



F. Bach round, convex^ 



11. HeterophyUi, L. ool. A. heteropliyllus (Fig. 41). 



12. Ligatiy cret. A. planulatus (PI. III., Fig. .3). 



Fig. 63. Ammonites coronatus* 



13. Annulati, ool. A. annulatus, biplex, giganteus. 



14. Coronati, ool. A. coronatus (Fig. 63), sublsevis. 



15. Fimhriati, ool. A. fimbriatus, lincatus, hircinus. 



16. Cassiani, 36 species of very variable form, and reraarkable 

 for the number and complexity of their lobes. Trias, Austrian 

 Alps. 





Fig, 6i.t 



Examples, A. Maximiliani (Fig. 64), A. Metternichii. 



CmocERAS, Leveille. 



Etymology, Jcrios, a ram, and ceras, a horn. 

 Synonym, Tropaeum, Sby. 



Example, C. cristatum, D'Orbigny (PI. III., Fig. 8). 

 Shell discoidal ; whorls separate. 



Distribution, 13 species. Neocomian — Upper greensand. 

 Britain, France. 



* Fig. 63. Profile of Ammonites '-coronatus (Brtig.). (Reduced f from D'Orbigny.) 

 Kellowaj' Rock, France, d I, dorsal lobe ; s s, dorsal saddles ; /' /' lateral lobes ; s' s', 

 la'oi al saddles ; accessory and ventral lobes. The number of accessory lobes increases 

 with age. 



t Fig. 64. Am. Maximiliani, Klipstein. {= A. bicannatus, Miinst.) Tiias, Hallstadt 

 (copied from Quenstedt). A, profile, showing the numerous lobes and saddles; B, 

 suture of one side ; v, dorsal saddle. 



