354 Mr. Jeffreys on the Testaceous Pneumonobranchous 



6. Ventricosa. 

 Minimal 



Testa ventricosior, tenuis, subpellucida, nigro-fuscescens, 

 striis argutis numerosis exarata. Anfractus 12, sutur^ 

 obliquiore. Apertura subquadrata, dilatata, plicis 2 

 columellaribus approximatis, mediisque 2 vix 3 mi- 

 noribus instructa : peristomio tenui, fer^ disjuncto. 



Long. 0.65. — Diam. 0.125. 

 Clausilia ventricosa. Drop. Hist, des Moll. p. 7. t. 4i. 



f. 14. 

 Helix perversa (adulta). Miill. Verm. 2. p. 118. 

 Turbo biplicatus. Mont. Test. Brit. p. 361. t. 11. /. 5. 



Maton Sf Rackett in Linn. Trans. 8. p. 179- Dillw. 



Cat. 2. p. 874. 

 Helix (Cochlodina) ventriculosa. Fh\ Tab. des Moll. 



p. 63. 



For this also I am indebted to Mr. Dillwyn, who received 

 it from Colonel Montagu as British. It bears some resem- 

 blance to the C. plicatula, but is larger, of a thinner texture, 

 and has the striae much finer and more numerous. The 

 teeth are also differently disposed. 



The C ventricosa of Draparnaud constitutes a variety of 

 this species, distinguished by the more oval form of the 

 aperture and more tumid volutions. 



Derugata. 



Animal ^dWidh fulvum. Tentacula superiora clavata, longiora. 



Testa subarcuata, ventricosior, glabriuscula, nitida, pellu- 



cida, fulva. Anfractus 10 — 12. Apertura subrhom- 



boidea, biplicata : peristomio albo, subincrassato, co- 



lumellae insidenti : clausio emarginato. 



Long. 0.65. — Diam. 0.135. 



Clausilia 



