auriculid^:. 2*27 



* * Leuconia. 



Pillar two- plaited; throat smooth; peristome simple. 

 Marine. 



86. 2. Conovulus bidentatus. Two-toothed Cono- 

 vulus. (t. f. 145.) Shell ovate, ventricose, 

 smooth, shining white ; spire short ; suture indis- 

 tinct; mouth oblong; two of the plaits of the 

 pillar larger than the rest; peristome slightly 

 thickened and reflexed in front, 



Voluta bidentata. Mont. T. B. Suppl. 100. t. 30. 

 f. 2. 



Auricula bidentata. Ferussac, Tab. Moll. 103.; 

 Gray, Ann. Phil. 15. ; Jeffreys, Linn. Trans, xvi. 

 368. 



Var. Auricula erosa. Jeffreys, Linn. T?*ans.x.vi. 269. 



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

 by the tide. 



Animal, according to Montagu, is 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. 



The spire of the shell is sometimes eroded, and 

 because the specimens which Mr. Jeffreys observed in 

 this state were a little more ventricose, he has de- 

 scribed them as a different species. 



87. 3. Conovulus albus. Shell fusiform, pointed, 

 thin, white, pellucid, slightly transversely striated ; 

 whorls six ; mouth slender, oblong ; pillar two- 

 plaited. 

 Voluta alba. Mont. T. B. 245. (not Suppl. ) ; 

 Turton, Diet. 



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