CEPHALOPODA. 



199 



F. Bach round, convex* 



11. HeUrophylli, L. ool. A. heterophyllus (Fig. 41). 



12. Licjati, cret. A. planulatus (PL III., Pig. 3). 



Fig. 63. Ammonites coronatus.^ 



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



14. Coronati, ool. A. coronatus (Pig. 63), sublseYis. 



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



16. Cassiani, 36 species of very yariable form, and remarkable 

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

 Alps. 



Fig. 64.1 



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



Crioceras, Leveille. 



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

 Synonym, Tropseum, Sby. 



Example, 0. cristatum, D'Orbigny (PL III., Fig. 8). 

 Shell discoidal; wborls separate. 



Distribution, 13 species. Neocomian — Upper greensand. 

 Britain, France. 



* Fig. 63. Profile of Ammonites '■coronatus (Brug.). (Reduced ^ from D'Orbigny.) 

 Kelloway Rock, France, d I, dorsal lobe ; s s, dorsal saddles ; V V lateral lobes ; s' *•, 

 lateral saddles ; accessory and ventral lobes. The number of accessor}' lobes increases 

 with age. 



t Fig, 64. Avi. Maximiliam, Klipstein. {= A. bicannatus, Miinst.) Trias, Hallstadt 

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

 euturo of one side ; r, dorsal saddle. 



