PUNCTURELLA. 243 



ness, completing a regular spire of 2 2 whorls in all. Slit stands very 

 high, its upper end rising to the crest of the shell, though still remote 

 from the apex; it is long, narrow and deep, and tapers off at both 

 ends ; the old scar is deep and narrow. Margin thin and sharp, 

 toothed all around, but hardly crimped within ; behind it is very 

 patulous, but elsewhere the internal slope is very steep ; the two 

 sides are very straight and converge backwards. Inside porcellanous, 

 deeply hollowed into the apex ; a sharp little furrow that resembles 

 a crack runs up from the margin to the slit, which is almost quite 

 covered in all its length by the patulous but small and flatly arched 

 unbuttressed septum. Length 0*31, breadth 0'19, alt. 0*15 inch. 

 This species is peculiarly long and narrow, and roomy within from 

 its steep walls and blunt apex. Its sculpture too is very striking. 

 ( Wats.) 



Off Culebra Island, West Indies, 390 fms. 



Rimula granulate SEG. Pal. Malac. d. Terreni Terz. di Messina, 

 Fissurellidi, p. 14, t. 5, f. 6. Puncturella (Oranopsis^ granulata 

 WATSON, Challenger Gastrop., p. 46, t. 4, f. 5. 



Originally described from the Miocene marls of Kometta, near 

 Messina. 



P. PROFUNDI Jeffreys. PI. 27, figs. 73, 74. 



Shell small, thin, roundly oval ; the front slope is slightly con- 

 vex, the others still more slightly concave ; the top, of which 

 merely the extreme tip is incurled, projects upwards and a little 

 backwards in a point which is sharpened by the crater-like hole of 

 the slit close in front ; minute riblets closely beaded score the sur- 

 face ; the slit is large and round. Sculpture : There are very 

 many radiating riblets which are sharp and distinct but very min- 

 nte ; the surface is also delicately fretted with fine concentric undu- 

 lations, which in crossing the riblets rise into sharp little contiguous 

 tubercles, but in the narrow intervals are almost invisible. Color 

 frosted glassy-white. Apex fine, sharp, prominent, projecting up- 

 wards and backwards, with only the extreme tip (which is very 

 small) incurled and slightly turned round ; there are fully two 

 whorls. Slit is a largish round hole with a pointed prolongation 

 backwards ; it lies close in front of the tip and cuts away the natu- 

 ral top of the shell. Margin excessively thin, patulous all around, 

 not crimped. Inside glassy ; a very small hollow runs into the 

 apex ; the lines of the outside ribs are just perceptible ; there is no 



