220 DlI'TYCllOCERAS, (UKHLOCERAS, ETC. 



Uenus PTYCHOCERAS, .r<hli. 



Shell bent once upon itself; the two straiglit portions in contact. 



Eight species. Xeocomian t(j Cretaceous. L'tirope ; Indian- 

 United States. 



r. Emericianis, d'Orb. PL 10 1, tig. b:U\. France. 



.Subgenus Diptychoceras, Gabb. 



Three straight limbs in contact. \ Pfi/choceras in every 

 respect except that it has an additional limb which incurves, en- 

 velopiug both the preceding to a slight degree only. Meek con- 

 siders it doubtfully identical with Pfi/chGcera.t. 



Genus COCHLOCEKAS, H 



luer 



Shell spirally elongated, scalai-iforni. strongly scnlplurcd ; 

 sutures of septa with several ronuded lobes. 



Three species. Alpine Triassic. Hallstatt. Austria. 

 C. FiscHERii. Hancr. PL 100. tigs .MS. .")19. 

 (ieiuis ANCYLOCERAS, .rOrb. 



Shell at lirst spiral, discoidal with separated whorls; after- 

 wards produced at a tangent and then bent back again upon 

 itself like a hook. 



Forty species. Infer. Oolitic, (Jretttceous. Europe: South 

 America; United States. 

 A. SPINIGERUM, Sowb. PL 100, fig. .o^C). (iault. Folkestone. 



On us ANISOCERAS, Pie-tut. 



Shell at first s[)iral, lielicoid. whorls separated, at length more 

 or less prolonged and reflected; transversely ribbed ; sutures of 

 septa with five lobes and saddles, all bipartite. 



Twelve species. Gault to Upper Greensand, Europe. Creta- 

 ceous, Jurassic, India. 

 A. Saussureanus. Fictet. J'l. 100, fig. 52s. 



Genus SCAPHITES, Parkinson. 



Shell at first closely spiral, involute, :it length detached and 

 recurved ; sutures many lobed, lobes foliated. 



Nineteen species. Oolitic, Cretaceous. Europe ; India ; 

 United States. 

 S. EQUALis, Sowb. PL 100, fig. 527. Chalk marl. Sussex, Eng. 



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