GASTEROPODA. 87 



Od. Tenia pusilld, elongalo-ovatd, pellucidd (?) tenia, et fragili ; apice obtuso ; 

 (Difractibus quatuor vel quinque convexis ; suturis profundis ; longitudinaliler tenuissime 

 costellafis ; transversim striatis, decussatis ; labro acuto ; umbilico mcdiocri ; columella 

 obsolete unidentd. 



Shell small, thin, fragile, and pellucid (?) with four or five convex volutions, 

 and a deep and distinct suture ; longitudinally costulated with 18 — 22 slightly 

 raised ribs decussated by seven or eight transverse lines ; aperture ovate ; outer 

 lip sharp and plain within ; a small but distinct umbilicus ; and a rather obscure 

 fold upon the columella . 



Axis, \ of an inch. 



Locality. Cor. Crag, Sutton. Recent, British Seas. 



I have procured about half-a-dozen specimens of this elegant little shell, some 

 of which are in sufficiently good preservation to be identified. The opportunity 

 of comparison with a recent specimen has been obligingly afforded me by Mr. 

 Thompson, of Belfast, and I have every reason to think they are the same. The 

 apex is obtuse, but not reversed. There is a small but obscure fold upon the 

 columella, scarcely discernible, except where the outer lip is broken away. 



4. Odostomia simillima (?). Mont. Tab. IX, fig. 6, a — b. 

 Turbo simillimus. Mont. Test. Brit. Sup. p. 136, 1803. 



— Wern. Mem. vol. i. p. 406, t. 8, fig. 15. 



— Turt. Conch. Diet. p. 209, 1819. 

 Turritella simillima. Flem. Brit. An. p. 303, 1828. 

 Rissoa (?) costellata. <S. Wood. Catalogue 1842. 



Od. Testa pusilld, elongatd, subulatd, gracili ; apice obtuso ; anfractibus quinque 

 convexis ; suturis profundis ; longitudinalitcr costellatis ; costellis rectis ; aperturd ovatd, 

 simplici, dimidiam spirant aquante ; sine umbilico. 



Shell minute, elongate, tapering, and slender, with an obtuse and reversed apex ; 

 volutions five, convex ; suture deop, longitudinally costellated, with perfectly 

 straight ribs ; aperture ovate, rather elongate ; last volution large, measuring half 

 the axis. 



Axis, \ of an inch. 



Locality. Cor. Crag, Sutton. Recent British Seas. 



I have but a few specimens of this elegant little shell, which appear to differ in 

 some characters from the description of its recent analogue, to which I have referred 

 it with doubt. It is much smaller, and the costse are broad and smooth, havino- 

 twenty in the last volution. The spaces between them are very narrow ; the suture 

 is subcanaliculated, by the upper part of the outer lip being somewhat slightly 

 raised, and there is a small obscure tooth upon the columella ; my specimens are 

 not in very good condition. Turton gives the recent shell as found on the shores 

 of the island of Jura. 



