458 K. J. Basil — Mollusca of Cape Hatt&ras. 



widtli to tlie ribs. The whole sui'fjice is covered with distinctly 

 raised, rounded cinguli and microscopic threads roughened by the 

 fine lines of growth, and have the appearance, under the microscope, 

 of being covered with minute grains of sand. The cingulus at the 

 centre and defining the shoulder of the whorls is the most conspicu- 

 ous ; above this there are about five finer ones, and below, on the 

 whorls of the spire, two 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, oblong, broadest at its posterior third, 

 pinched up anteriorly into a straight, slightly elongated canal. 

 Outer lip thin, with a sharp edge and a shallow sinus just below 

 the suture ; inner lip inconspicuous. No operculum. 



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

 in adult specimens to deep brown with yellow ribs and canal. 



licngth, 0-5'""' ; breadth, 3'""^ ; length of aperture, 3'"'" ; its breadth, 



Several specimens both living and dead, in 14 to 48 fathoms. 



This species is closely allied to M. ceviiia, but difters in. having a 

 stouter form, more angularly shouldered whorls and especially in 

 having acute, very prominent, straight ribs extending from suture to 

 suture. 



Mangilia ceroplasta, sp. nov. ^ 



Shell of medium size, stout, waxen-yellow, with an abruptly ta- 

 pered, blunt spire, less than half the length of the shell, composed of 

 six and a half well rounded whorls. Nucleus large, regularly coiled, 

 rather blunt, somewhat lustrous, of two and a half whorls; the second 

 is crossed by four unequal, equally distant, nodulous carina3, the first, 

 just below, and the fourth, just above the suture, are very fine and 

 quite indistinct. Below this the whorls are crossed from suture to 

 suture, by little elevated, rounded, straight ribs separated by inter- 

 vals about equal to their own width ; both of these are intersected by 

 a distinct median carina and three or four less conspicuous equally 

 distant ones below it. On the body whorl there are about sixteen 

 smaller ones, somewhat crowded anteriorly. Very fine microscopic 

 threads cover the intervening surface and all are roughened, or ren- 

 dered granulous, by the intersection of the tine striae in the direction 

 of the lines of growth. Aperture broad-ovate ; outer lip thin, broadly 

 curved ])osteriorly, with a very slight inbending anteriorly. Col- 

 umella slightly curved. Iinier lip shown by a narrow strip of dark 

 colored enamel. Color light yeUow witli a narrow band of dark red- 



