GASTEROPODA. 87 



anfradibus quatuor vel quinque comexis; suturis profundis ; longitudinalitcr tenuissime 

 costellatis; transversim striatis, decussatis ; labro acuto ; umbiUco mediocri ; 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.M.em. vol. i, p. 406, t. 8, fig. 15. 



— Turt. Conch. Diet. p. 209, 1819. 

 TuRBiTELLA 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 ; lont^itudinalifer costellatis ; costellis rectis ; aperturd ovatd, 

 simplici, dimidiam spiram cequante ; sine umbilico. 



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

 volutions five, convex ; suture deep, 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 refen-ed 

 it with doubt. It is much smaller, and the costse are broad and smooth, having twenty 

 in the last volution. The spaces between them are very narrow ; the suture is sub- 

 canaliculated, 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. 



