66 



Mangelta lanceolata. Shell very long, lanceolate : brownish, 

 more or less tinged with purple, with fine spiral lines of white and of 

 dark brown, which are more conspicuous on the ribs ; with a darker 

 and wider brown line along the suture : with six very prominent 

 acute transverse ribs on each whorl, which are nearly or quite con- 

 tinuous on the successive whorls ; with a spiral elevated line, on the 

 middle of the whorls, which is obsolete in the intercostal spaces and 

 has nodtdous intersections with the ribs : apex acute : spire with rec- 

 tilinear outlines : whorls eight, scarcely convex, with a lightly im- 

 pressed suture : labrum finely denticulate within : sinus shallow : ca- 

 nal not very short. 



Mean divergence 23°; length of spire .20 inch; total length .44 

 inch ; breadth .14 inch. 



Mangelia crassicostata. Shell subfusiform : dark reddish 

 brown, paler about the apex : with very strong and very prominent 

 transverse ribs, smooth on the summits, about ten on each whorl, 

 with the transverse sections of the intercostal spaces almost regularly 

 concave ; with a few distant elevated spiral lines, of which one is on 

 the middle of each whorl, and one is on the lower half, and the rest are 

 anterior : apex acute : spire with quite convex outlines : whorls 

 about seven, rather convex, with a well impressed suture : aperture 

 narrow : labrum much thickened by the last rib : sinus rather large 

 and deep : canal very short. 



Mean divergence 42°; length of spire .13 inch; total length .22 

 inch ; breadth .1 inch. 



This species resembles Mangelia hadia Rv., but that shell is repre- 

 sented with a smaller spire and more slender ribs. It may possibly 

 be a variety of 31. fusca Ad. ^ 



Mangelia brevis. Shell short, fusiform, orange or wax yellow, 

 white along the upper part of the whorls and anteriorly : with very 

 strong transverse ribs, about nine on each whorl, smooth on the sum- 

 mits, with unequal microscopic spiral elevated lines : apex subacute : 

 spire with very convex outlines : whorls about six, moderately convex 

 or subangular, with a lightly impressed suture : aperture quite nar- 

 row : labrum much thickened by the last rib : sinus rather large : 

 canal very short. 



Mean divergence about 45'' ; length of spire .065 inch ; total length 

 .135 inch ; breadth .07 inch. 



Mangelia yicina. Shell fusiform, moderately elongated : dull 

 brownish red, white along the upper part of the whorls and anteriorly: 



