REPORT ON THE GASTEROPODA. 47 



slope is concave in consequence of the overhanging apex ; the small close-set radiating 

 ribs are beaded with contiguous small rough tubercles ; the long narrow fusiform slit rises 

 very high, and is remote from both apex and margin. Sculpture : From the apex over 

 100 small irregular and unequal riblets radiate to the margin; they are closely beset 

 with small rough tubercles like beads ; there are no concentric threads, but a few 

 unequal lines of growth can be seen ; the riblet which runs from the slit is double, with 

 a minute furrow between the riblets ; its direction is not quite constant in different 

 specimens. Colour: The shell is pure white, porcellanous under the thin straw-yellow 

 membranaceous epidermis, which is rather caducous. Apex very much reverted and 

 depressed so as to stick out backwards bluntly, but prominently in the mid-line of the 

 shell ; the minute smooth white tip stands out on the right with considerable distinctness, 

 completing a regular spire of 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 round, 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. L. 0*31 in. B. 0*19. 

 H. 0-15. 



This species is peculiarly long and narrow, and roomy within from its steep walls and blunt 

 apex. Its sculpture, too, is very striking. 



10. Puncturella (Cranopsis) profundi, Jeffreys. 



Puncturella profundi, Gwyn Jeffreys, "Valorous" Moll., Ann. and Mag. Nat. Hist., ser. 4, vol. xix., • 

 1877, p. 232. 

 „ „ Gwyn Jeffreys, Presid. Address, Brit. Assoc. Biolog. Sec, 1877, p. 3. 



„ ,, Gwyn Jeffreys, "Lightning" and "Porcupine" Moll., Proc. Zool. Soc. Lond., 



Nov. 14, 1882, p. 675, pL 1. fig. 10. 

 „ (Cranopsis) profundi, Watson, Journ. Linn. Soc. (Zool.), Nov. 16, 1882, vol. xviL p. 35, 



sp. 7. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. Off 

 Culebra Island, West Indies. 390 fathoms. Pteropod ooze. 



Habitat. — North Atlantic. 740 to 1750 fathoms. 



Shell. — Small, thin, roundly oval ; the front slope is slightly convex, 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 surface ; the slit is large and 

 round. Sculpture : There are very many radiating riblets, which are sharp and distinct 



