﻿146 



Cincinnati Society of Natural History. 



This interesting species belongs to the true Murices, modern 

 species of the group only occurring in Africa and East Indies. 



Pleurotoma (Surcula) longiforma, n. sp. PL 2, figs. 10, a. b. 

 Shell, fusiform ; volutions, eleven to twelve, convex beneath, sub- 

 angulated and constricted above ; suture, plainly marked ; the in- 

 dented space convex in some specimens, in others flat, and covered 

 with close revolving lines; a prominent line bounding the periph- 

 ery, sometimes minutely beaded ; revolving lines on the lower 

 part of each volution fainter, obsolete on center of body whorl, 

 rather prominent and alternate on the beak, which is long and 

 straight nearly half the length of the shell ; lines of growth rather 

 prominent; slit in lip profound (Fig. 10 b). Length, 2^ inches. 



Localities, Carson's Creek, Red Bluff, and Vicksburg, Miss. 



This species has the form and markings of Surcula Gabbi Con. 

 from Texas, but a comparison with the type of that species shows 

 it to be different in the number of whorls, shape of the upper part 

 of the volutions, and general form. 



Pleurotoma Heilprini, n. sp., PI 3, fig. 15. Shell, short, 

 broadly fusiform, decussated; whorls, eight; surface covered with 

 revolving lines crossed by prominent nodes upon the spire, sculp- 

 ture rather fine ; suture, impressed, bordered by a raised band, 

 which is cut by the longitudinal lines ; apex, pointed, the first 

 two whorls smooth ; upper part of the volutions concave ; body 

 whorl, angulated at the shoulder, cancellated ; the angulation and 

 depressed margins giving the shell a twisted appearance ; aperture, 

 narrow; canal, short, rather wide, and twisted; sinus, deep, rather 

 wide, trigonal ; a slight callosity on the upper part of the columel- 

 lar lip, which is smooth below; outer lip, thin, wavy from the 

 striations, smooth inside* lines of growth prominent on the body 

 whorl, and the raised lines very numerous. Length, fa of an 

 inch ; breadth, fa. 



Locality, Moody's Branch, Jackson, Miss. 



Named in honor of A. Heilprin, Esq., of the Philadelphia 

 Academy of Natural Sciences. 



