K. J. Bush — Mollusca of Cape Hatteras. 455 



whorls concave with rounded angles, and in its coloring, the charac- 

 ters which Mr. Gabb mentions as belonging especially to C Deles- 

 sertii Recluz. Both may be only variations of the same species. 



Shell of medium size. Spire elevated, one-third the length of the 

 shell, turreted, abruptly tapered to a small, very acute apex. Whorls 

 nine (tip broken), concave, distinctly angulated just above the 

 suture, forming a prominent, rounded keel, which is noduloiis on the 

 upper whorls, becoming smooth on the lower ones. The broad, con- 

 cave, subsutural band is crossed by numerous, very fine, very much 

 curved lines of growth and several unequal, and unequally separated, 

 impressed, revolving lines and microscopic stria?. Body-whorl long, 

 diminishing regularly toward the anterior end, and nearly straight 

 along the sides, angulated considerably below the suture with a 

 prominent, rounded keel, above which there is a wide, concave sub- 

 sutural band, corresponding to that of the whorls of the spire. 

 There are about twelve broad, deep, revolving grooves near the 

 anterior end of the whorl, the spaces between them decreasing ante- 

 riorly; the rest of the surface is covered by unequal, wavy, im- 

 pressed, revolving lines and mici'oscopic striae, crossed by the fine, 

 flexuous lines of growth. Aperture narrow, of nearly uniform 

 width; outer lip thin, very much curved forward from the broad, 

 deep, posterior sinus. Interior glossy, bluish white, the exterior 

 coloring showing distinctly along the edge. Epidermis light yellow- 

 ish brown, raised in small, distinct scales along the lines of growth. 

 Color light yellow, banded with white and marked with irregular 

 chestnut-brown spots. On the body- whorl, commencing at the 

 shoulder, there are three broad light yellow bands, ornamented with 

 irregular, longitudinal, chestnut-brown spots, alternating with white 

 bands, ornamented with three or four rows of smaller chestnut- 

 l)rown, rounded and quadrangular spots. On the spire, the shoulder 

 of the whorls is white, and with the subsutural band is ornamented 

 with irregular, transverse sj^ots of chestnut-brown. 



Length, 51"""; breadth, 24"""; height of sjiire, 18'""^; length of 

 aperture, 38""" ; its breadth, 4""". 



Mangilia psila, sp. nov. 



Plate XLY, figure 2. 



Shell of moderate size, slender, rather thick, very plain, yellowish 

 white, with a dull, lusterless surface. Whorls about six and a half 

 elongated, decidedly angulated, forming an elongated, blunt spire. 



Trans. Conn. Acad., Vol. VI. 57 .June, 1885. 



