50 



* V. EDENTULA. Gray's Tart., p. 199, pi. 7, fig. 80. 

 Locally common. 



V. PYGMiEA. Turbo Sexdentatus, Junior. Mont. Test. 

 Brit., vol. 2, p. 337, pi. 12, fig. 8. V. P. Gray's Tart., 

 p. 202, pi. 7, fig. 83. Montagu found it in a boggy place 

 in Cornwall, on the yellow water flag; and I believe I 

 found it in a pond at Pentuan. 



BALiEA. 



GENERIC CHARACTER: The shell reversed, thin, with 

 a lengthened, taper spire, the last volution larger than the 

 next, aperture roundish oval, entire at the base, oblique, 

 with a single tooth on the pillar, which is wanting in the 

 young shells, and the pillar is destitute of any valvelike 

 plait or clausium. From Bulimus and Pupa this genus 

 is distinguished by the aperture being left handed ; from 

 Clausilia in having the ultimate volution proportionately 

 larger than the next; and from Vertigo, in the regularity 

 of its mouth. From the young of Clausilia it may be 

 known by the front of the last whorl being convex and 

 simple, not flattened and furnished with a keeled ridge 

 near the outer edge. Gray. 



* B. PERVERSA. Turbo P. Mont. Test. Brit., vol, 2, 



p. 355. pi. 11, fig. 12. B. P. Flem. Brit. An., p. 271. 

 Gray's lurt., p. 207, pi. 6, fig. 70. Common. 



CLAUSILIA. 



GENERIC CHARACTER: The shell reversed, with a 

 lengthened, slender, spindle formed spire, the last volution 

 less tumid than the one before it, with an obtuse or pa- 

 pillary summit; aperture oval, oblique, united all round 

 and margined, toothed ; throat with an internal spiral 

 shelly plait (clausium) fixed on an elastic pedicle, which 

 closes the cavity when the animal is withdrawn. 



* C. BIPLICATA. Turbo B. Mont. Test. Brit., vol. 2, 

 p. 361, pi. 11, fig. 5. C. B. Flem. Brit. An., p. 271. 

 Gray's Tart., p. 214, pi. 5, (]g. 55. Commou. 



C. NIGRICANS. Turbo Bidens. Turt. Lin. T. Perver- 

 sus. Pen. Brit. Zo„ vol.4, pi. 82, fig. 116. T. B. Mont. 

 Test. Brit., vol. 2, p. 357, pi. 11, fig. 7. C. Perversa. 

 Flem. Brit. An., p. 271. C. N. Gray's Turt., p. 217, 

 pi. 5, fig. 58. Not common within my observation. 



A UR1CXJLIDM. 



Is a family instituted by Mr. Gray, and chiefly charac- 

 terized by peculiarities in the animal: "which has an 

 elongated foot, an elongate ringed muzzle, two subcylindrical 

 tentacles with the ej^es near the inner side ( that is, placed 

 behind instead of in front of) their base ; body spiral, placed 



