RISSOA. 125 



is local : it is common along with the banded variety in 

 many places in Dorset and Devon, on the west coast of 

 Ireland, in crevices of rocks in the Isle of Man, and under 

 stones at low water in the Hebrides, (E. F.). 



Loven records the cingiUus among Scandinavian mol- 

 lusca, and we have gathered the variety rupestris abun- 

 dantly near Bergen in Norway (E. F.). The species, so 

 far as known, is a member chiefly of the Celtic fauna, and 

 does not range far to the south of Britain. 



R. viTREA, Montagu. 



Subcylindrical, smooth, white ; whorls rounded, the penult 

 turn peculiarly large ; body nearly as long as the spire ; suture 

 very oblique ; outer lip acute : no umbilical crevice. 



Plate LXXV. fig. 5, 6. 



Turbo vitreus, Mont. Test. Brit. vol. ii. p. 321, pi. 12, f. 3. — Turt. Concli. 

 Diction, p. 202. — Dillw. Recent Shells, vol. ii. p. 838, — 

 Wood, Index Testae, pi. 31, f. 52. 

 Heliai vifrea, Maton and Rack. Trans. Linn. See. vol. viii. p. 213. 



„ glabrata, Megerle Muhlf. Verhand. Gesel. Nat. Berlin, vol. i. pi. 9, 

 f. 10? 

 Cingiila „ Fleming, British Animals, p. 308. — Brit. Marine Conch, p. 182. 

 ? Rissoa pmctulum, Fhilippi, Moll. Sicil. vol. i. p. 154, pi. 10, f. 11 ; from 

 which, Desh. Lam. Anim. s. Vert. vol. viii. p. 476 ; 

 changed to glabrata, Philippi, Moll. Sicil. vol. ii. p. 130. 

 Rissoa viirea, Macgilliv. Moll. Aberd. p. 329. — Brown, Illust. Conch. G. B. 

 p. 13, pi. 9, f. 81. 

 „ crTjstallina, Brown, Illust. Conch. G. B. p. 13, pi. 9, f. 76 ? 



There is a peculiarity in the look of this interesting 

 shell which allows us to separate it, at a glance, from 

 any known species of its genus. It is subcylindrical, 

 but attenuated above, very thin, semitransparent, per- 

 fectly smooth, and of a shining and uniform white. Of 

 the five and a half very convex whorls of which it is 

 composed, the last two are so loosely coiled as almost 



