354 Mr. Jerrreys on the Testaceous Pneumonobranchous 
6. VENTRICOSA. 
Animal i 
Testa ventrieosior, tenuis, subpellucida, nigro-fuscescens, 
striis argutis numerosis exarata. Anfractus 12, sutura 
obliquiore. Apertura subquadrata, dilatata, plicis 2 
columellaribus approximatis, mediisque 2 vix 3 mi- 
noribus instructa : peristomio tenui, feré disjuncto. 
Long. 0.65.— Diam. 0.125. 
Clausilia ventricosa. Drap. Hist. des Moll. p. T. t. 4. 
f. 14. 
Helix perversa (adulta). Müll. Verm. 2. p. 118. 
Turbo biplicatus. Mont. Test. Brit. p. 361. t. 11. f. 5. 
Maton § Rackett in Linn. Trans. 8. p. 179. Dillw. 
Cat. 2. p. 874. 
Helix (Cochlodina) ventriculosa. Fér. 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 striz 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 
: aperte and more tumid volutions. — 
T. Drivene 
Animal pallidé fulvum. Tentacula superiora clavata, longiora. 
Testa subarcuata, ventricosior, glabriuscula, nitida, pellu- 
= sida, fulva. Anfractus 10—12. Apertura subrhom- 
> ea, biplicata: peristomio albo, subincrassato, co- 
ell: identi: clausio Cn eee 
ng. O 65 —Diam. 0.135. 
Clausilia 
