GASTROPODA— EULIMID2E— PYRAMID ELLID7E. 709 



345. F. marylandica (Conrad). (Fig. 1021, <?,/.) Miocenic. 

 Differs from the preceding chiefly in its finer radiating plications 



or striations, in not being compressed laterally and in the larger 

 apical fissure. 



Chesapeakean of Atlantic coast. 



Family Eulimid/E Fischer. 

 C. Eulima Risso. 

 Small, turreted, smooth and lustrous non-umbilicated shells 

 with dextral protoconch. (A columellar tooth occurs in Syrnola 

 Adams.) Triassic-Recent. 



346. E. eborea (Conrad). (Fig. 1022, a.) Miocenic. 



Fig. 1022. 



e, Turbonilla nivea ; d, T. inter- 



Eulima eborea ; 6, Niso lineata 

 rupta ; e, Chrysallida melanoides ; f, Odostomia conoidea. (After Md. Survey.) 



Long, slender (13 whorls), sides of whorls flat, suture flush, 

 surface smooth, base of body whorl curving. 

 St. Mary's and Calvert formations of Maryland. 



CI. Niso Risso. 



Like the preceding, but deeply umbilicated. Triassic-Recent. 

 347. N. lineata Conrad. (Fig. 1022, b.) Miocenic. 



Sides (shoulders) of whorl nearly flat and smooth ; peripheral 

 angulation pronounced, generally visible only on body whorl. 



Calvert formation of Maryland. 



Family Pyramidellid.e Gray. 

 CI I. Turbonilla Risso. {Cliemnitzia d'Orb.) 

 Like Eulima, but with depressed suture, protoconch coiling in 

 vertical plane, and smooth or ribbed. Columellar tooth present 

 in Pyrgulina. Tertiary-Recent. 



