168 ON THE NAIADES, 



its translucency, and its colours are very characteristic. On the infe- 

 rior part of the carina, which is obtuse, the brown colour is more in- 

 tense — on the superior part the yellow is brightest. 



Helix vesica. Plate XIX. fiff. 67 



O' 



Testa teniii, peUucidd, svperne elevatd et fusco-Iuted, in/erne inflalu albdqiie, 

 transverdm minute striatd, umbilicatd, anfractibus qidyiis ; spird obluso-conicd ; 

 aperturd subrotundd ; labro tenui et reflexo, inferne crassescenti ; columella Isevi. 



Shell thin, transparent, elevated and brownish yellow above, inflated and white be- 

 low, longitudinally and minutely striate, umbllicated ; whorls five ; spire obtusely 

 conical ; aperture nearly round ; outer lip thin and reflected, on the lower part slightly 

 thickened ; columella smooth. 



Hab 



My Cabinet. 

 Diara. -7, Length -5 of an inch. 



Remarks. — This species is peculiarly transparent, and very strongly 

 resembles the cuticle of a blister or the bladder of a fish. This char- 

 acter, and its pale brownish-yellow superior portion, and white inferior 

 portion, together with its longitudinal striae, eminently distinguish it. 

 The lower part of the reflected lip is so much thickened as almost to 

 form a tooth. 



Helix cincta. Plate XIX. fig. 68. 



Testd superne depressd, inferne inflatd, longitudinaliter striatd, umbilicatd, 

 ruf o-f used, fasciam fu scam aut nigram super ryiedios anfractus habente ; anfrac- 

 tibus quaternis ; spird planulatd, aperturd subrotundatd ; labro simplici ; colum- 

 elld Isevi. 



Shell depressed above, inflated below, longitudinally striate, umbilicated, reddish 

 brown, with a dark brown or black band above the middle of the whorls ; whorls four ; 

 spire flattened ; aperture nearly round ; outer lip simple ; columella smooth. 



