^80 REPORT OF COMMISSIONER OF FISH AND FISHERIES. [78] 



Mangilia rubella Kurtz and Stimpson. 

 B. range, 14 fathoms ; t 15 fathoms.* 



Mangilia cerina (Stimp.) Yeirill. 

 B. range, 14 to 15 fathoms.t 



Mangilia epJiamilla Bush, sp. uov. 



B. range, 14 to 15 fathoms ; t 48 fathoms.* 



Shell of moderate size, rather stout, with a regularly tapered, acute 

 spire, consisting of about fire sharply angulated whorls below the nu- 

 cleus. Suture marked by a distinctly raised, rounded, undulating, 

 spiral thread. Nucleus small, prominent, semi-transparent, glassy, com- 

 posed of about two and a half turns, with a small, rather prominent 

 apical whorl, which, with the second, is very smooth ; the third is crossed 

 by delicate, curved, transverse riblets, which are rendered somewhat 

 nodulous by the intersection of a single, faint, revolving, median thread; 

 the others have about nine broad, prominent, acute, straight, longitu- 

 dinal ribs extending from suture to suture, and separated by deep, con- 

 cave interspaces about equal in width to the ribs. The whole surface 

 is covered with distinctly raised, rounded cinguli and microscopic 

 threads, which are roughened by the intersection of the fine lines of 

 growth, and, under the microscope, have the appearance of being cov- 

 ered with minute grains of sand. The cingulus at the center, defining 

 the shoulder of the whorls, is the most conspicuous ; above this there 

 are about five finer ones, and below, on the whorls of the spire, tAvo or 

 three, the number increasing to ten or twelve on the body- whorl. The 

 aperture is a little less than half the length of the shell, narrow, ob- 

 long, broadest at its posterior third, pinched up anteriorly into a 

 straight, slightly elongated canal. Outer lip thin (broken) ; inner lip in- 

 conspicuous. No operculum. 



Color in alcohol deep yellow, with white ribs and canal. 



Length of largest specimen, 6.5™™ ; breadth, 3™™ ; length of aper- 

 ture, 3™™; its breadl.h, .5™™. 



One living specimen (No. 35,404) was taken at station 2,108; also, 

 young dead specimens at stations 2,112 (IsTo. 35,884), and at 2,114 (No. 

 35,515). 



This species is closely allied to M. cerina, but differs in having a 

 stouter form, more angularly shouldered whorls, and especially in hav- 

 ing very prominent, straight ribs extending from suture to suture. 



Mangilia melanitica Dall, var. oxia Bush. 



B. range, 14 to 15 fathoms.* 



Shell small, slender, fusiform, lustrous, transparent, glassy, with a 

 tall, regularly tapered, acute spire ; whorls eight, slightly convex, an- 

 gulated, carinated, with the suture defined by a distinct, smooth, rounded 

 thread ; nucleus large, acute, consisting of three and a half rapidly ta- 

 pering coils, with a small, very prominent, decidedly upturned apical 



