1871.] H. F. Blanford— On Camptoceras, Sfc. 41 



subcomplanata. Peristoma continuum, integrum, fusco-inargina- 

 tum. 



Alt. 4.5 mm. ; diam. 2.3 mm. — Aperture alt. 3.5, lat. 1.7 mm. 



Habitat cum prsecedente. 



It is not with entire confidence that (not having seen the animal) 

 I attribute this species to the genus Camptoceras, since it differs from 

 the typical species in having the whorls contiguous, except behind 

 the peristome. In most specimens that I have examined, little 

 more than the peristome is free, but in one or two, at least a quarter 

 of the last whorl is not in contact with the penultimate whorl, as 

 may be seen if the shell be held up to the light, or over a sheet of 

 white paper in a proper position. The character of the peristome 

 and of the shell surface closely resemble those of the more typical 

 species of Camptoceras, and that the habits of the animal are similar, 

 may be inferred from its association with the preceding species. As 

 far as can be judged, therefore, the evidence is preponderant in 

 favour of this generic alliance I have adopted. Perhaps it may not 

 be irrelevant to add that no species of Physa has yet been discovered 

 in India. 



Alycseus digitatus, nov. sp. PL II. fig. 4. 



Testa solida, depresse turbinata, umbilicata, albido-cornea, re- 

 gulariter costulata ; pone aperturam usque ad tubulum striata* 

 Spira parum exserta, apice obtusulo. Anfractus 4, rotundati ; ul- 

 timus inflatus, deinde constrictus, iterum abrupte expansus, denique 

 abrupte constrictus, antice depressus et in 5 plicationes validas de- 

 sinens. Tubulus post constrictionem oriens, recurvatus, £ anfractus 

 subrequans. Sutura impressa. Apertura perobliqua. Peristoma 

 duplex ; externum simplex, evertatum ; internum continuum, super- 

 ne valde prolongatum, 5-plicatum. Plica basalis abrupte recurvata. 

 Operculum corneum, extus concavum. 



Alt. 3.6 mm. ; diam. major 5.5 ; minor 4 mm. 



Aperturse alt. 2.25, lat. 2.75 mm. 



Habitat apud Darjeeling in vallo Bungno fluminis Himalayse 

 Sikkimensis. 



Of all the Alycozi yet described with plicate peristomes, this 

 exhibits the character in the most exaggerated degree ; the free 



6 



