CEPHALOPODA. 199 
F. Back round, convex. 
11. Heterophylii, . ool. A. heterophyllus (Fig. 41). 
12. Ligati, cret. A. planulatus (Pl. II., Fig. 3), 
Fig. 63, Ammonites coronatus.* 
13. Annulatt, ool. A. annulatus, biplex, giganteus. 
14. Coronati, ool. A. coronatus (Fig. 63), subleevis. 
15. Fimbriati, ool. A. fimbriatus, lineatus, hircinus. 
16. Cassiani, 36 species of very variable form, and remarkable 
for the number and complexity of their lobes. Trias, Austrian 
Alps. 
Fig. 64.4 
Examples, A. Maximiliani (Fig. 64), A. Metternichii. 
CrRIOCERAS, Leveille. 
Etymology, krios, a ram, and ceras, a horn. 
Synonym, Tropzeum, Sby. 
Example, C. cristatum, D’Orbigny (Pl. III., Fig. 8). 
Shell discoidal; whorls separate. 
Distribution, 13 species. Neocomian— Upper greensand. 
Britain, France. 
* Fig. 63. Profile of Ammonites ‘coronatus (Brug.). (Reduced } from D’Orbigny.) 
Kelloway Rock, France. d/, dorsal lobe; ss, dorsal saddles; /' 7' lateral lobes; s' s’, 
lateral saddles ; accessory and ventral lobes. The number of accessory lobes increases 
with age. 
+ Fig. 64. Am. Marximilian, Klipstein. (= A. bicarmmatus, Miinst.) Trias, Hallstadt 
(copied from Quenstedt). A, profile, showing the numerous lobes and saddles; B, 
suture of one side; v, dorsal saddle, 
