ODOSTOMIA. 173 



in that inland gulf being unsuitable to the uniform com- 

 position of the shell. 0. Scilla is much larger and more 

 conical than the present species, and has an angulated 

 base. 



The typical form is the Turbonilla producta of Loven 

 and, apparently, the Pyramis lavis of Brown. 



34. O. NiTiDis'siMA"^, Montagu. 



Turbo nifidissimus, Mont. Test. Br. (ii.) p. 299, t. 12. f. 1. Aclis nitidis- 

 sima, F. & H. iii. p. 223, pi. xc. f. 6, 7. 



Shell needle-shaped, very thin, transparent and lustrous : 

 sculpture, none in worn specimens such as are usually picked 

 out of shell-sand from the beach, but in live or fresh specimens 

 it consists of extremely fine and regular spiral striae or im- 

 pressed lines, which are slightly fiexuous, rather widely and 

 not close-set ; they are easily discernible with a Coddington 

 lens : colour clear white : spire gracefully tapering to a blunt 

 point ; nucleus entirely exposed and twisted obliquely upwards 

 in various directions, resembling a miniature SpiriaUs : ivhorls 7 

 (besides the nucleus), very convex, and gradually enlarging ; 

 the last occupies rather more thiui one-third of the shell : suture 

 wide and deep, decidedly oblique, and microscopically notched 

 across : mouth regularly oval, not much expanded below ; length 

 about one-sixth of the spire : outer lip rounded, inflected just 

 below the periphery : inner lip not so much curved, adhering 

 to the upper slope of the base, where it is united with the outer 

 lip, not reflected below : umhilicus and tooth none : operculum 

 rather solid, delicately striated in the hue of growth, and having 

 a narrow flap. L. Ol. B. 0-02. 



Habitat : Guernsey, Cornwall, Devon, Ireland (west, 

 south, and east), Scarborough, Berwick, Moray Firth, 

 Pentland Firth, West of Scotland, and Shetland, from 

 5 to 30 f. It has not occurred in any of our post-tertiary 

 or quaternary deposits. I recognized in Professor LiU- 

 jeborg^s collection at Upsala specimens which he had 

 dredged at Mangerfiord in Finmark, in M. Cailliaud^s 

 collection at Nantes smaller specimens found by him at 



* Most glossy. 



