OF CONCHOLOGY. 143 



the angle, whicli is carinated and obscurely crenulated ; beak 

 produced, reflected at the end. 



Length Ig- inch. 



Locality. — Claiborne and Texas. 



MONILIOPSIS, Courad. 



Description. — Turrited, cancellated; fissure of labrum shal- 

 low ; beak very short. 



M. ELABORATA, {PleUTOt.,) nob. 



This beautiful shell does not agree in generic character with 

 other Pleiirotomidse, but it forms a connecting link between 

 the shells with a smooth or entire columella and the plaited 

 genera Scohinella, and Borsonia. 



DRILLIA, Gray, 



D. Texana, nob. 



Description. — Turrited, whorls seven, polished, longitudinally 

 costate; ribs prominent, rather distant ; suture profoundly cari- 

 nated; deposit on labium thick and broad ; beak very short. 



Locality — -Wheelock, Texas. 



TORTOLIVA, Conrad. 



Description. — Subcylindrical, or subovate; spire short, ob- 

 tuse; aperture elongated, effuse at base; columella callous, 

 with an impressed, oblique fold. 



T. Texana, nob. 



Description. — Ancilliform, smooth ; spire papilliform, and 

 consisting of two volutions ; an impressed, sinuous line 

 extends along the body near the columella, beneath which an 

 oblique impressed is continued from the columellar fold. 



Leno-th h inch. 



MONOPTYGMA, Lea. 



M. CURTA, nob, — pi. 11, fig. 8. 



Description. — Subelliptical ; spire short, the volutions 

 slightly convex, indented at the suture; body volution 

 ventricose, abruptly rounded above, near the suture; 

 aperture patulous; columella with a prominent acute fold, 

 and tortuous and obtusely carinated towards the base ; basal 

 margin wide. 



Locality. — Claiborne, Alabama, 



