GASTROPODA— CANCELLARIID7E. 797 



CLXXXIX. Olivula Conrad. 

 Vertically striate, Oliva-like shells with somewhat channeled 

 suture. 



609. 0. staminea Conrad. (Fig. 11 69.) Eocenic. 

 An impressed line just below the suture constricts off a sub- 



sutural band; aperture rather broad posteriorly; columella ante- 

 riorly with striated callus ; surface with strong vertical, and faint 

 revolving lines. 



Claibornian of Alabama and Texas. 



CXC. Ancillopsis Conrad. 

 Subglobular ; with short spire and large body whorl ; inner lip 

 with strong callus. Differs from Ancilla chiefly in its subglobose 

 form. Eocenic. 



610. A. subglobosa Conrad. (Fig. 1 170.) Eocenic. 

 Subglobose to suboval ; apex sharply pointed ; suture obsolete ; 



columella with profound callus projecting in the middle. 

 Claibornian of Alabama. 



Family Cancellariid^e Adams. 

 CXCI. Cancellaria Lamarck. 

 Moderately spired shells, with generally round whorls; inflated 

 body whorl; broad aperture with short canal or notch; columella 



FlG. 1 1 72. a, Cancellaria graciloides, X f J ^> C. alternata, X f ; c, C alternala 

 var., Xi't d > c - lunata, Xl» e > C - {Trigonosioma) biplicifera, X f. (Md. 

 Survey. ) 



with several strong oblique plicae; ribs commonly cancellated by 

 the spirals. Cretacic-Recent. 



611. C. graciloides Aldrich. (Fig. 1172,0.) Eocenic. 



Whorls elongate-rounded ; suture deeply depressed, with a slight 



