406 PROCEEDINGS OF THE ACADEMY OF [1890. 



Ancillaria ancillops, n. sp. PI. XI, fig. 4. 



Shell smooth, fusiform, having much the appearance of Oliva Ala- 

 hamensis; whorls strongly convex, the first four or five prominently 

 ribbed ; sub-sutural band, with sigmoidal lines of growth, well 

 marked; aperture broad, about one-half the length of .shell ; colu- 

 mellar surface markedly concave, w'ith a pseud-umbilicus ; basal 

 notch profound. 



Length somewhat more than an inch. 



Smithville, Bastrop Co. 



The reverse of this shell has much the aspect of Oliva Alabavien- 

 sis. 

 Crassatella Texana, n. sp. PI. XI, fig. 6. 



Shell irregularly rhomboidal ; valves prominently angulated pos- 

 teriorly, with the post-umbonal slope broad and slightly concave ; 

 umbones prominent, well incurved ; hinge powerful ; exterior sur- 

 face ornamented with strong and closely set lines of growth, which 

 traverse the entire shell, becoming, however, less prominent on the 

 umbonal slope. 



Length of shell about an inch and a quarter, slightly exceeding 

 the height. Smithville ; McBee's School ; near Alto ; St. Augus- 

 tine Co. 



This species is comparatively more elongated than Crassatella an- 

 testriata, of Gabb, which in some respects it closely resembles. The 

 ornamentation, too, is carried completely across the shell, and is not 

 restricted to the anterior moiety of the valves. 



