45 Olsson, Neocene Fossils 



DESCRIPTION OF SPECIES 



Nassa cornelliana, n. sp., Plate 4, Fig. 11 



Shell small, heavy, elongate; with three and a half smooth 

 nuclear and four subsequent whorls; suture appressed; the first 

 sculpture to be introduced is a transverse ribbing ; this is soon fol- 

 lowed by four impressed revolving lines ; on the body whorl the 

 transverse sculpture consists of seven or eight large, thick ribs, and 

 these are continued in the same line across the earlier whorls, in- 

 terrupted at the suture; on the body whorl the transverse ribbing 

 is crossed by about nine impressed revolving lines which on the 

 middle of the whorl are separated by wide bands but become more 

 crowded at the base and next to the suture; on the earlier whorls 

 only four revolving lines are present; the ribbing is made only 

 slightly nodose by the revolving lines and there is no pronounced 

 shoulder to the whorls; canal short, straight, with numerous re- 

 volving lines and separated from the rest of the shell by a moder- 

 ate sinus; mouth subovate in shape, with a small sulcus at the pos- 

 terior commissure; outer lip thickened and with about seven lirse, 

 which alternate in strength; pillar lip callous, smooth and with a 

 raised border; siphonal fasciole strong. 



Height 5, greater diameter 2.5 mm. 



This species is characterized by its elongate shape, impressed 

 revolving lines and the strong, transverse ribbing. Its nearest 

 related form appears to be N. caloosaensis Dall, but differs from 

 that species in its more elongate form, lack of the shoulder on its 

 whorls and its larger size. 



Duplin Miocene{?) ; Currie, N. C. 

 Lirosoma sulcosa, var. multicostata, n. var„, Plate 5, Fig. 13 



Shell of the general shape of C. sulcosa Con . , but usually 

 smaller, with the anterior canal more produced ; body whorl two- 

 thirds the length of the shell : surface of shell strongly sculptur- 



