272 Mr. W. H. Benson on some species of Cyclostoma. 



its relation to the more Westerly Himalayan species, C. strangu- 

 latum, which was alluded to in my former remarks. The follow- 

 ing character should be added : — " Callo suturali retroyerso, 

 poue constrictionem posito (ut in C. strangulato). 



Cyclostoma funiculaturriy Benson, Journ. Asiat. Soc. 1838. 



Specimens received of the young of C. funiculatumy in differ- 

 ent stages of growth, show very different forms, which might 

 cause the shell to be assigned to other species, or even to a dif- 

 ferent genus, if unaccompanied by the thin horny operculum. 

 In the young state, with 5^ whorls, the shell is pale horn colour, 

 with a slight rufous tint, the periphery of the last whorl is an- 

 gular, the base slightly convex, nearly planate, the mouth oblong- 

 quadrate, the right and left lip nearly parallel, and forming a 

 right angle, somewhat rounded, with the horizontal base. In 

 this state, moreover, the shell is perforate. In the next stage, 

 with six whorls, the shell has become thicker and more opake, 

 the epidermis reddish olive, the periphery of the last whorl more 

 acutely angular, the base concave, while the umbilicus is filled 

 up, the mouth is elliptical, and the square base of the aperture 

 has given place to an angular inferior termination. In the adult 

 the aperture is rounded, the peristome reflected and thickened 

 with an orange enamel, and the periphery of the last whorl is 

 rounded, and has a funiculate border round the impervious 

 rimation. The adult C, funiculatum is figured in plate 31 B. of 

 then* Thesaurus,' f. 316-7. 



■ fc* Cyclostoma Aurora^ Benson, Annals, vol. viii. p. 186. 



The shell described was an uncoated and worn specimen. The 

 following addition will represent the species when perfect : — 

 '' Carinarum interstitiis striis elevatiusculis spiralibus obductis, 

 rubente, supra strigis castaneis fulguratis, subtus fasciis plu- 

 ribus, mediana latiori, variegata; epidermide tenui fugace ob- 

 tecta. Operculo ut in C. Involvulo.'^ 



The specimens which have enabled me to make the above cor- 

 rections were collected for me, at Darjiling, by Mr. Robert Trot- 

 ter, of the Bengal Civil Service, together with some new forms 

 of Helix, and a new Clausilia, the third species which has been 

 found in Northern India, where the genus is confined to the 

 mountain ranges, and appears to have been debarred, by the in- 

 tervention of the Gangetic plain, from penetrating to the moun- 

 tains of Central or Southern India, whereas in ultra Gangetic 

 India the continuous mountain ranges have enabled species to 

 descend to a low latitude in the Malayan Peninsula. 



