234 PUNCTURELLA. 



The species has somewhat the form of P. granuluta Seg., but is not 

 so compressed, and the sculpture is quite different. ( Wats.) 



North of Culebra Id., West Indies, 390 fms. 



P. agger Wats. J. L. S. L. xvii, p. 32 ; Challenger Gastrop., p 

 40, t. 4,'f. 6. 



P. brychia Watson. PI. 26, figs. 38, 39, 40, 41. 



Shell very small, porcellanous translucent, oval, very slightly 

 broader in front ; its side slopes are slightly, its front slope extremely 

 convex, its back slope is short and flattened, and very much over- 

 hung by the protuberant apex ; there are sparse and distinct riblets. 

 The slit is short and coarse, though not large ; and from it a broad 

 round ridge trending to the right runs out to the margin. Sculpt- 

 ure : The riblets are neither strong nor sharp ; but they are distinct, 

 rising as little round threads from the flat surface, and being parted 

 by broad intervals, rather strongly pitted by the little specks of the 

 genus ; the ridge which runs down the front of the shell is the full 

 breadth of the slit ; the concentric stripe are mere slight irregular 

 lines of growth. 



Color clouded, porcellanous white under the brownish caducous 

 epidermis. Apex very much curled in and bent down, but not 

 spread out on the backward slope; the minute extreme tip is 

 exserted and projects; the whorls are 2.1. Slit: The open part is 

 short and narrowly oblong, and as broad in front as behind, from 

 which point the old scar runs up the crest. Margin thin, patulous,, 

 especially behind, crenulated by the riblets. Inside porcellanous, 

 deeply hollowed into the apex ; scored by the rib-furrows, of which 

 the one in front is very strong, particularly near the slit, which is 

 rather closely covered by the strong, slightly arched septum, which 

 has a retracted edge and is unbuttressed. 



Length 0'18. breadth 012, alt. 0'1 inch. ( Wats.) 



In the animal the eye-peduncles are present ; but no eyes are 

 visible. The pedal papilla? are very small, as is also the funnel" 

 shaped process leading to the shell-slit. 



This species in general form is a good deal like P. agger, but is 

 more tumid and higher ; the apex and sculpture are very dissimilar. 

 Than P. conica d'Orb., which is much of the same size, P. brychia, 

 has the apex much more turned over ; the form is broader and much 

 more depressed. ( Wats.) 



Off Halifax, N. S., 1340 fms. 



