CONOVULUS. 195 



Mr. Jeffreys suspected that Valuta hyalina Mon- 

 tagu was only an imperfect specimen of this species : 

 Montagu's specimen is a foreign marine shell not 

 yet arrived at its full growth. 



b. Pillar tivo-plaited ; throat smooth ; peristome 

 simple. (Leuconia.) Marine. 



89. 2. CoNOVULUS Udentatus. Two-toothed Cono- 

 vulus. — Shell ovate, ventricose, smooth, shining 

 white ; spire short ; suture indistinct ; mouth 

 oblong; two of the plaits of the pillar larger 

 than the rest ; peristome slightly thickened and 

 reflexed in front, (t. 12. f. 145, 146.) 



Voluta bidentata. Mont. T. B. Suppl. 100. t. 30. f. 2.— Auri- 

 cula bidentata. Fenissac, Tah. Moll. 103.; Gray., Ann. Phil. 

 15.; Jeffreys., Linn. Trans, xvi. 368. (not Govld). — Jaminia 

 bidentata. Leach, Syn. Moll. 97. — Acteon bidentatus. Fle^n. 

 B. A. 337. — Conovulus bidentatus, and C. alba. Gray, Man. 

 227. t. 12. f. 145, 146. — Auricula Micheli. Mettre, Rev. 

 Zool. 1841, 66. — Auricula dubia. Cantr. Bull. Brux. ii. 

 383. — Ovatella bidentata. Bivona, 22. t. 2. f. 10. (?) — 

 Auricula myosotis, var. ft. Philippi, Moll. Sicil. i. 143. (?). 



Var. Auricula erosa. Jeffreys, Linn. Trans, xvi. 269. 



Var. alba, shell and aperture rather narrower, spire rather 

 more produced, lower fold nearly obsolete: t. 12. f. 146. 

 Voluta alba. Tiwt. C. Diet. 250. (not Montag. nor Maton 

 and Racket.^ — Auricula alba. Feruss- Tah. Moll. ; Gi'ay., 

 Ann. Phil. 1825, 15.— Volvaria alba. Flem. B. A. 333. 



Inhab, the sea-coast (of Devon), under stones left 

 by the tide. 



Animal, according to Montagu, white, with two 

 very short angular tentacula, usually edged with 

 black, and with two black eyes at their base behind ; 

 the foot extending before the head, bifid. 



o 2 



