ZONITES. 41 



p. 34.— Brown, Illust. Conch. G. B. p. 53, pi. 18*, f. f), 10. 

 — L. Pfeif. Monog. Ilelic. vol. i. p. 98. 

 f Felix tiitida, var. a, Jeffreys, Trans. Linn. Soc. vol. xvi. p. 339, 511. 



„ Ittcida, var. f Turton, Manual L. and F. W. Shells, p. 57. 

 Zonites excavatus. Gray, Manual L. and F. W. Shells, p. 175, pi. 12, f. 13S. 



Shell small, rather depressed, sub-orbicular, thin, trans- 

 parent, polished, of an uniform fulvous yellow, or yellowish 

 horn colour, not opaque beneath, with distinct longitudinal 

 strire or wrinkles, spii'e a little raised, apex blunt. Whorls 

 five, moderately convex, or even slightly rounded, well 

 defined, very slowly enlarging ; the last scarcely exceeding 

 the penult, but little descending, and more shelving below 

 than above. Aperture rather small, rounded, crescent- 

 shaped, scarcely broader than high, in width not more than 

 equal to two-fifths the total diameter. Peristome thin, 

 simple, not reflected, base well rounded, umbilicus very 

 large, displaying all the superior volutions. 



Diameter scarcely a quarter of an inch. 



The animal is lead-coloured (Alder). In Yorkshire, 

 Northumberland, Durham, and other counties in the North 

 of England and South of Scotland, are its favourite loca- 

 lities. It has been taken near Cork in Ireland by Miss 

 King, and at Clifden in Gal way (W. Thompson). As yet 

 it has not been noticed out of Britain. 



Z. CRYSTALLINUS, Mullcr. 



Minute, nearly flat, shining, white, transparent ; body scarcely 

 broader than the preceding turn ; mouth lunate ; umbilicus 

 small. 



PlateCXXII. fig. 1,2. 



Helix crystallina, Muli.er (not Fleming), Hist. Verm, pt. 2, p. 23. — Gray, 

 Medical Repository, 1821, p. 239. — Jeffreys, Trans. Linn. 

 Soc. vol. xvi. p. 341. — Alder, Trans. Nat. Hist. Soc. 

 Northumb. vol. i. p. 36. — Turton, Manual L. and F. W. 



VOL. IV. G 



