PUNCTURELLA. 235 



P. brychia WATS. J. L. S. L. xvii, p. 32 ; Challenger Gastrop., p. 

 41, t. 6, f. 7. 



P. OXIA Watson. PI. 26, figs. 46, 47, 48, 49. 



Shell very small, thin, oval, narrowed in front, depressed ; its 

 slopes are straight at the sides, slightly and regularly convex in 

 front; merely the extreme tip is curled in, and the top projects 

 sharply upward and backwards immediately in front of the break 

 of the slit; the surface is closely dotted with minute tubercles; the 

 slit is rather large and round. Sculpture : There are neither ribs 

 nor concentric lines, but the surface is pretty closely dotted over 

 with minute rough tubercles, which are arranged in somewhat inter- 

 rupted and irregular zig-zags. Color translucent, and at the tuber- 

 cles transparent. Apex incurved and turned back, but not bent 

 down ; there are two whorls. Slit : There is a largish round hole 

 obliquely cut off from the top and prolonged backwards into a point. 

 Margin very thin, patulous, not crimped. Inside glassy ; a very 

 small hollow runs up into the apex ; the surface is scored with 

 many irregular minute scratch like white threads, which are more 

 perceptible on a slightly worn than on a fresh specimen ; there is 

 no anterior furrow ; the slit, as seen from within, is round, and is 

 very little interfered with by the short, thin, triangular, straight- 

 edged almost perpendicular septum. Length 0*14, breadth 0*1, alt. 

 0-07 inch. (Wats.) 



This species has some features of resemblance to P. profundi Jeffr., 

 but is Hatter and in sculpture is quite different. (Wats.) 



Of Culebra Islands, West Indies, 390 fms. 



P. oxia WATS., J. L. S. L. xvii, p. 36 ; Challenger Gastrop. p. 44, 

 t. 4, f. 8. 



P. SPORTELLA Watson. PI. 26, figs. 42, 43, 44, 45. 



Shell very small, strongish, oblong, with straight slopes before and 

 at the sides, and markedly concave behind ; the apex is very small, 

 and it alone projects backwards ; the surface is finely cancellated ; 

 the slit is lozenge-shaped. Sculpture : There are very many slightly 

 irregular, coarsish radiating riblets crossed by concentric threadlets, 

 which are rather finer and closer but somewhat more irregular, and 

 which form minute knots in crossing the riblets ; from this sculpture 

 results the basket-work appearance from which the name of the 

 species has been adopted. Color white, with a faint tinge of rud- 

 diness. Apex is exceedingly minute ; and it is the little embryonic 



