A. H. Foord — Ammonites in the British Museum. 



399 



or Oxford Clay, and HopUtes radiatus (Fig. 19), of the Neocomian. 

 (Wall-cases 5, 9, 10; Table-cases 62-68.) 



Another characteristic shell of this group is the AcantJioceras 

 Bhotomagense of the Lower Chalk. (Table-case 62.) 



A small group of forms still remains to be considered whose' 

 structure (external and internal) has led to their being regarded as 



Fig. 18. 



Fig. 19. 



Cosmoceras Jason, Eein. 

 (Callovian.) 



Soplites radiatus, Bru" 

 (Neocomian.) 



offshoots from the Stephanoceratid^. They may be divided into 

 two sections — the first, consisting of shells partly uncoiled; the 

 second, in which the shells are completely coiled, with deeply 

 embracing whorls. 



Section I. — The form of ScapMtes immediately recalls that of 

 Macroscaphites, but it differs in several particulars : it is much 

 more closely coiled, that is, the inner coils of the shell are not seen, 



Fig. 20. 



ScapMtes Hugardianus, d'Orb. (Cretaceous.) 



being covered up by the succeeding ones ; and further, the uncoiled 

 part is much shorter and its outline more rounded, while it bends 

 over so as to almost reach the coiled part, ScapMtes is abundant in 

 the Middle and Upper Cretaceous. (Table-case 61.) Crioceras has the 

 form and curvature of an Ammonite, but the whorls are not in contact 

 (Fig. 21). It was formerly supposed that this genus was wrongly 



