K. J. Bush — Mollusca of Cape Hatteras. 465 



Ptenoglossa, 

 Scalaria leptalea, sp. nov. 



Shell comparatively thin and delicate, rather stout, large, composed 

 of ahout ten regularly tapered, very convex whorls. The nucleus is 

 small, and consists of two and a half smooth, shining whoi'ls ; below 

 this the surface is crossed by delicate, thin, slightly raised, reflected, 

 oblique ribs, between which there are very numerous, exceedingly fine 

 cinguli^ aliout fifteen to the millimeter. On the upper whorls the 

 ribs are very numerous, exceedingly fine and very close together, 

 becoming less numerous, coarser and farther apart on the lower ones. 

 The number decreases in a ratio of ten, there being thirty-six on the 

 eighth whorl, twenty-six on the ninth, and sixteen on the body- 

 whorl. Aperture ovate; outer lip thin with a reflected edge; inner 

 lip thickened and reflected anteriorly. 



Color bluish white. 



Length of the largest specimen, with imperfect nucleus, 15-5"""; 

 breadth, 5-5"'™ ; length of aperture, 4"""; its breadth, about 3'"'". 



One adult and several young specimens, in 14 to 16 fathoms. 



Scalaria teres, sp. nov. 



Plate XLV, figure 8. 



Shell very small and slender, thin, delicate, semi-transparent, very 

 shining. Whorls about nine, very convex, regularly coiled, crossed. 

 by numerous (about twenty-seven on the body- whorl) very thin, del- 

 icate, slightly raised, a little oblique ribs, having an almost imper- 

 ceptible angle just below the suture. Nucleus large, delicate pink, 

 consisting of three and a half perfectly smooth, shining whorls. 

 Aperture oval ; inner lip thickened, slightly reflected at the base. 

 Color bluish white with a delicate pink apex. 



Length, 4'"™ ; breadth, 1-5'"'"; length of aperture, about 1"""; its 

 breadth, about •5'"". 



This species can be readily recognized by its size, delicacy and 

 very brilliant luster. 



Two living specimens from stations 2275 and 2276, in 16 fathoms. 



Gymnoglossa. 

 Niso aeglees Bush. 



Report U. S. Com. Fish and Fisheries, p. 83, for 1883, 1885. 

 Plate XLV, FiauRES 10, lOa, 



Shell of moderate size, regularly tapered, conical, thin, semi-trans- 

 parent, smooth, shining, consisting of about twelve^ closely coiled 



