CEPHALOPODA. 95 



16. Cassiani, 36 sp. of very variable form, and remarkable for the number 

 and complexity of their lobes. Trias, Austrian Alps. 



w% 



I 



A 



Fig. 57.* 



Ex., A. MaximiKani (fig. 57), A. Metternicliii. 



Ckioceras, Leveille. 

 Eli/7)i., krios, a ram, and ceras, a horn. 

 St/n., tropEeiim, Sby. 



Ex., C. cristatum, D'Orb. (pi. III., fig. 8). 

 Shell, discoidal ; whirls separate. 

 Distr., 9 sp. Neocomian — Gault ; Brit., France. 



ToxocEKAS, D'Orb. 

 Et'jm., toxon, a bow, ceras, a horn. 

 Ex., T. annulare, D'Orb. (pi. III., fig. 12.) 

 Shell, bow-shaped ; like an ammonite uncoiled. 



Distr., 19 sp. Neocomian. Between this and crioceras and ancyloceras 

 there are numerous intermediate forms. 



Ancylocekas, D'Orb. 

 Etijm.., anculos, incurved. 

 Ex., A. spinigerum (pi. III., fig. 10). 



Shell, at fii"st discoidal, with separate whirls ; afterwards produced at a 

 tangent and bent back again, like a hook or crosier. 



• Distr., 38 sp. Inf. oolite — chalk. S. America (Chile and Bogota), Em-ope. 

 ScAPHiTES, Parkinson. 

 Etym., scaphe, a boat. 

 Ex., S. equaUs (pi. III., fig. 9). 



Shell, at iii'st discoidal, \\\i}i close whirls ; last chamber dctac^hed and 

 recurved. 



Distr., 17 sp. Neocomian —challf. Em-ope. 

 Helicoceras, D'Orb. 

 Efi/ni., helix (helicos), a spiral, and ceras, horn. 

 Ex., H. rotundum, Sby, sp. pi. III., fig. 11 (diagi'am). 



* Fig. 57. Am. Maximiliani Klipstein. (= A. bicarinatus Mlinst). Trias, Hall- 

 stadt (copied from Quenstedt). A, Profile shewing the numerous lobes and saddles. 

 li, suture of one side ; v, dorsal saddle. 



