49 



than the next; aperture oval, entire at the base, not half as 

 long as the spire, and without teeth; the peristome inter- 

 rupted; outer lip generally thickened and reflexed. 

 The shell of this genus is distinguished from that of Lim- 

 na?us by wanting the oblique fold on the pillar; from Ciau- 

 silia, in being regular, and in having tile peristome simple and 

 interrupted ; and from Pupa in having the spire regularly 

 tapering. 



* B. ACUTUS. Turbo Fasciatus. Turt. Lin. Pen. Brit. 

 Zo., vol, 4, pi. 82, fig, 119. Stew. E!em., vol. 2, p. 410. 

 Mont. Test. Brit., vol. 2, p. 346. B. A. Flem. Br. An., 

 p. 265. Gray's Turt., p. 184, pi. 6, fig. 17. Abundant in 

 the heat of summer, in some situations near the sea ; and 

 remarkably so in the west of the county, in sandy soil. 

 This shell is sometimes carried into the sea to a consider- 

 able distance. I have taken it from the stomach of a Dab 

 ( Pieuronectes Limanda) that had swallowed it, in com- 

 pany with other small shells, for the sake of the Hermit 

 Crab that occupied it. I have also found it mixed with 

 shellsand from the Isle of Sark. 



B. OBSCURUS. Helix O. Mont. Test. Brit., vol. 2, p. 391. 

 Flem. Br. An., p. 265. Gray's Turt., p. 183, pi. 6, fig. 63. 

 Not common. 



ZUA. 



GENERIC CHARACTER: The shell ovate, subcytindri- 

 cal, somewhat blunt, with a smooth polished periostraca; 

 mouth ovate, thickened and united all round ; peristome 

 toothless; axis imperforated. 



* Z. LUBRICA. Helix L. Turt. Lin. Mont. Test. Brit., 

 vol.2, p. 390. Bulimus L. Flem. Brit. An., p,265, Z. L. 

 Gray's Turt., p. 188, pi. 6, fig. 65. Common. 



PUPA. 



GENERIC CHARACTER: The shell cylindrical, abruptly 

 obtuse; whorls close pressed, gradually enlarging ; mouth 

 semi-oval, mostly toothed inwardly ; peristome reflexed, 

 and interrupted behind. 



* P. TJMBILICATA. Turbo Muscorum. Turt. Lin. Mont. 

 Test. Brit., vol. 2, p. 335. Flem. Brit. An., p. 268. P. U. 

 Gray's Turt. p. 194, pi. 7, fig. 78. Common. 



VERTIGO. 



GENERIC CHARACTER: The shell subey lindrical, 

 abruptly obtuse, the whorls close pressed, gradually en- 

 larging; mouth contracted, more or less angular, generally 

 toothed inwardly, and thickened by an exterior rib; peris- 

 tome simple. This genus has been separated from that 

 of Pupa, because the animal has only the upper pair of 

 tentacles, which bear the eyes, developed. 



H 



