REPORT ON THE GASTEROPODA. 489 



There are three unnamed specimens in the British Museum with which I identified this species, 

 which I now reckon to Odostomia densieostata, on the authority of Dr Gwyn Jeffreys. Philippi's types 

 I have not seen ; but I had accepted the general opinion that the species was a mere variety of 

 Odostomia rufa, Phil., and that I felt sure the Challenger species was not. Philippi's figure (loc. cit. 

 supra) certainly does not suggest Odostomia rufa and the Marquis of Monterosato now holds that 

 they are really distinct. 



17. Odostomia (Turbonilla) paucistriata, Jeffreys. 



Odostomia (Turbonilla) pavcistriata, J. Gwyn Jeffreys, Moll. "Lightning" and "Porcupine," Proc. 



Zool.[Soc. Lond., 1884, p. 361, sp. 44, pi. xxvii. fig. 6. 



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

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



Habitat. — Mediterranean, 40 to 65 fathoms ; Bay of Biscay ; west coast of Africa ; 

 (Jeffreys). 



Dr Gwyn Jeffreys suggests some doubts of the distinctness of this species from Odostomia com- 

 pressa, Jeffr. There are undoubtedly superficial resemblances, but assuredly he did well to part the 

 two. 



18. Odostomia (Turbonilla) sealpidens, n. sp. (PI. XXXII. fig. 1). 

 April 17, 1874. Port Jackson, Sydney, New South Wales. 2 to 10 fathoms. 



Shell. — Long, narrow, delicate, thin, glossy, with many ribs, small whorls, a constricted 

 suture, and a small half-turned-over depressedly turbinate sinistral tip. Sculpture : Longi- 

 tudinals — there are on the latter whorls about 20 to 25 (on the earlier they are fewer) fine 

 straight rounded but little raised riblets, parted by furrows of much the same size and form ; 

 they run from suture to suture, but are cut off on the base by a levelling up of the surface. 

 Spirals — none. Colour L hyaline white. Spire very high, narrow and conical. Apex : 

 the top is small, and consists of two depressedly turbinate and half-reverted whorls, of 

 which the first is minute. Whorls 11, exclusive of those of the apex; they are convexly 

 flat on the sides and short. Suture constricted, somewhat oblique. Mouth small, oval, 

 shortly pointed above. Outer lip thin, flatly convex, on the base patulous. Inner Up 

 thin and flat across the body ; obtuse-angled at the top of the pillar, which has a thin 

 faintly twisted edge, with nothing like a channel or umbilicus behind it. H. 0'24 in. 

 B. 0.05. Mouth, height 004, breadth 0'028. 



This species resembles Odostomia (Turbonilla) nitida, Angas (nee Adams) =hofmani, Angas, in 

 Bculpture, but, with slightly higher whorls, is very much more slender, being only one-third of the 

 breadth for the same length. 



(ZOOL. CHALL. EXP. — PART XLII. — 1885.) Tt 62 



