GASTROPODA— ACT7E0NID7E—RINGICULID7E. 807 



643. A. ovoides Conrad. (Fig. 1185, c.) Miocenic. 



Differs from A. shilohensis in its straighter sides, proportion- 



FlG. 1 185. a, Tornatellteabella ; b,Act<xon shilohensis ; c, A. ovoides. (Md. Survey.) 



ately higher whorl, and stronger subsutural shelf; spirals alter- 

 nating over entire shell. 



Chesapeakean of Atlantic coast. 



CXCIX. Act^eonina d'Orbigny. 



Shell elongately spired, with large 

 body whorl, becoming narrower to- 

 wards the base; columella without 

 folds ; outer lip sharp. Carbonic- 

 Recent. 



644. A. calif ornica Gabb. (Fig. 11 86.) 



Comanchic. 



Shell large ; body whorl about three 

 fourths of entire length of the shell. 

 Surface smooth ; inner lip with basal 

 callus. 



Horsetown beds of California. 



Family Ringiculid^e. 

 CC. Cinulia Gray. 

 Globose shells with short spire and 

 inflated body whorl; outer lip reflected, thickened; columella with 

 numerous folds ; surface spirally grooved or punctate. Comanchic- 

 Cretacic. 



645. C. mathewsoni Gabb. (Fig. 1187.) Comanchic. 

 Shell of four and a half whorls, the body whorl expanded; 



Fig. 1 186. Actaonina call/or- 

 nica, nat. size. (After Gabb.) 



