Mollusca of Great Britain. * i^ 'i •: :-■ I. '^.'-- S69 



ttira oblonga, plicis 2 columellaribus conspicuis : pe- 

 ristomio subincrassato, postic^ subreflexo. 'J 

 Long. 0. 15.— Diam. 0.085. ' ■ 



Voluta bidentata. Mont. Test. Brit. Suppl. p. 100. 



t.30.f.2. :y" • '':•■>■ 



Auricula bidentata. FSr. Tab. des Moll. p. 103. 



From the coasts of Devon ; but I have never found it 

 alive. It differs from the following in colour and thick- 

 ness, in the teeth or folds being more conspicuous, and not 

 sunk in the interior of the aperture, and especially in the 

 tumidity of the last volution. 



3. Erosa. 

 Animal 



Testa ovato-oblonga, solidior, albida, spird rugosd, saep^ 

 decorticate. Anfractus 4 — 5. Apertura oblonga, in- 

 ti^s juxta peristomium subincrassata, plicis 2 colu- 

 mellaribus pari^m obtectis munita ; peristomio tenui, 

 posticfe subreflexo. 



Long. 0.165.— Diam. 0.075. 



Not uncommon on the Plymouth coast on the under 

 surfaces of stones left bare by the tide. In Mr. Dillwyn's 

 cabinet I observed a specimen which had been sent him by 

 the late Colonel Montagu under the name of Voluta biden- 

 tata. In this the spire is more regularly produced ; and it 

 has that eroded appearance which is characteristic of the 

 species. 



Alba. 



:!y 'i'^f. 



Animal 



Testa fusiforrais, acuminata, tenuis, pellucida, alba, trans- 



3 B 2 versim 



