46 THE VOYAGE OF H.MS. CHALLENGER. 



threads ; the lanceolate slit is large and very low placed. Sculpture : From the 

 point 30 to 40 sharpish ribs radiate out, in whose interstices as they diverge smaller 

 ones appear, which finally rival the first, so that toward the margin 100 to 130 

 can be counted. The one in continuation of the generic puncture is slightly raised, 

 double, and partially split, especially above, giving the impression of a suture; these are 

 crossed by concentric threads of almost equal strength with the ribs, in crossing which 

 they rise into knots which sharply roughen the surface. Colour brownish-grey ; but the 

 specimen is somewhat blackened and discoloured. 1 Apex a good deal depressed, curled in, 

 and projected backwards exactly in the middle line of the shell, the minute tip just stand- 

 ing out on the right, forming a spire of 2-^ whorls. Slit very low, having its centre quite 

 two-thirds down the front slope ; it is lanceolate, square behind, broadening, a little 

 irregularly, in the middle, and slowly contracting to a small narrow point in front. The 

 old scar is a shallow furrow with sharp sides ; and the bottom is scored across with old 

 edge-lines. Margin thin, toothed, and crimped on the edges by the ribs. Inside porcel- 

 lanous, somewhat indented on the line of the ribs. The apex is deeply hollowed ; a 

 deepening and widening grove extends from the margin to the slit, which is shortly 

 covered by the regularly-curved, strong, unbuttressed septum. L. - 8 in. B. 0'62. 

 H. 0-32. 



This North Atlantic species is exceptionally large. In outline it somewhat resembles Simula 

 cognata, Gould. My remembrance of that species is that it is quite small ; but Gould figures it 

 large, and gives no indication of size beyond saying that it is small. Pundurella asturiana further 

 differs from it in being much rounder and lower, with a more depressed and reverted apex, and a slit 

 much more remote from the top. 



9. Pundurella (Cranopsis) granulata" (Seguenza) (PI. IV. fig. 5). 



Rimula granulata, Seguenza, Pal. Malac. d. Terreni Terz. di Messina, Fissurellidi, p. 14, pL v. fig. 6. 

 Pundurella {Cranopsis) granulata, Watson, Journ. Linn. Soc. Zool., vol. xvii. p. 31, sp. 2. 



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

 Island, West Indies. 390 fathoms. Pteropod ooze. 



Fossil. — From the Miocene marls of Itometta, near Messina. 



Shell. — Porcellanous white under a meagre yellow epidermis, rather thin, narrow, 

 broader in front, oblong, with a depressed and reverted top and incurved apex ; the side 

 slopes are steep and slightly convex, the front edge is long and very convex, the back 



1 The colour of living specimens from the Bay of Biscay proves to be very much the same. 



2 Not Fissuristpta granulosa, Jeffr. 



