K. J. Bush — MolluHca of Cape Hatteras. 457 



closer together than the others, and the intervenuig surfaces are 

 covered by unequal, microscopic threads. Above the angle of the 

 whorls the threads alone occur and number about nine. This ine- 

 quality in the spiral sculpture makes the edges of the transverse ribs 

 very rough and jagged. On the body-whorl there are about thirteen 

 cinguli below the shoulder, unequal in size and unequally separated, 

 those on the canal larger and closer together than those just above 

 it, while the fourth one below the angle is so prominent as to make 

 a slight angle in the outline of the whorl. Below this angle the 

 transverse ribs curve in toward the columella following the outline of 

 the outer lip, and extend to the end of the canal, the curvature being 

 most noticeable in a dorsal view. Very fine stride intersect the 

 cinguli and the threads in the direction of the lines of growth, ren- 

 dering them granular and give the appearance to the shell, when dry, 

 of being covered with a fine, gray dust. Aperture long, narrow- 

 ovate, with a moderately long, rather narrow canal. Outer lip not 

 thickened, with a comparatively thin edge and a broad, moderately 

 deep sinus extending from the suture to the angle. Columella 

 slightly curved ; inner lip marked by a narrow stripe of conspicuous 

 ]-ed. enamel. Color light yellow-brown ; interior of aperture of the 

 same conspicuous red color as the inner lip. In young specimens this 

 coloring is wanting. 



Length, nearly 8""" ; breadth, 3'"'"; length of a[)erture, 3-5'""' ; its 

 breadth, !'"■". 



One adult and four young si)eciniens were taken in 14 to 17 

 fathoms. 



Mangilla ephamilla Bush. 



Report U. S. Com. Fish aud Fisheries, p. 78, for 18S3, 1885. 

 Plate XLV, figures 4, 4a. 

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

 spire of about five sharply angulated whorls, besides the nucleus. 

 Suture marked by a distinctly raised, rounded, undulating spiral 

 thread. The nucleus is small, prominent, semi-transparent and 

 glassy, composed of about two and a half turns. The apical whorl is 

 small, rather prominent and with the second is very smooth ; the 

 third is crossed by delicate, curved, transverse riblets rendered 

 somewhat nodulous by the intersection of a single, faint, revolving, 

 median thread ; on the other whorls there are about nine, broad, 

 prominent, acute, straight, longitudinal ribs extending from suture 

 to suture, and separated by deep, concave interspaces about equal in 



