MACROCJILAMYS. / / 



[Ova of Ariojihanta lcev>j)es, Miill. (vide p. 29), 



" Citron-yellow in colour, quite soft, enclosed in a skin, which 

 is slightly loose like a hladder | filled, having a tendency to 

 assume the form of a prolate spheroid with deep furrows running 

 from end to end throughout. Length about 5-6 mm., diam. 

 4-4i. Probably all Ariophantas have similar ova." — Extract from 

 Dr. ~W. T. BlanforcVs Note-hool:.'] 



[Subfamily MACROCHLOIYIN^. 



Macrochlamyinae, Godwin-Austen, Mol. Ind. i, 1888, p. 25.3 ; ii, 

 1907, p. 170. 



Shells of very varied form; shell-lobes present in some genera; 

 the free caecum near the retractor muscle of the penis the 

 principal distinguishing character, this being, in most cases, more 

 or less closely wound. Amatorial organ in some species absent. 

 These are given subgeneric rank.] 



Genus MACROCHLAMYS. 



Macrochlamys. Benson, J. ui. S. B. i, 1832, pp. 13, 76; v, 1836, 

 p. 3.50 (no description); Gray, P. Z. S. 1847, p. 169; Stoliczka, 

 J. A. S. B. X, 2, 1871, p. 246 : Nevill, J. A. S. B. 1, 2, 1881, 

 p. 131 ; Godwin-Austen, Mol. Ind. i, 1883-88, pp. 76-92, 97-122, 

 209-215 ; id. t. c. ii, 1899, 1907, pp. 87-90, 136-137, 151-170. 



Nanina, Grcu/, partim, P. Z. S. 1834, p. 58 ; Benson, t. c. p. 89 ; id. 

 Zool. Journ. v, 1835, p. 458; Nevill, J. A. S. B. 1, 2, 1881, 

 p. 131, 7U'c Risso. 



Tanychlamys, Benson, P. Z. S. 1834, p. 89. 



" Orobia," Albers, Heliceen, ed. 2, 1860, p. 57. 



Type, M. petrosa, Hutton. 



Range. JSouth-eastern Asia, including the whole Indian Empire 

 except the dry regions of North-western India. 



Shell heliciform, perforate (rarely imperforate), depressed, 

 sometimes subglobose or subturbinate, thin, horny, as a rule 

 smooth and polished, especially beneath, occasionally distinctly, 

 often microscopically, striated or decussately sculptured ; aperture 

 lunate ; peristome tliiu, but in a few species internally labiate, 

 columellar margin reflected at the perforation. 



Animal large and active, and in the wet season scarcely retractile 

 withiii the sliell. Foot narrow, the sole divided, by the arrange- 

 ment of the muscles, into three parts, a median and two lateral 

 areas, often distinguished by slight differences of colour. The 

 mucous pore at the posterior extremity of tlie foot is large and 

 overhung by a fleshy horn-like pi-ocess, sometimes of considerable 

 length ; peripodial grooves well developed and double, the shallow 

 grooves on the surface of the foot above the peripodial groove 

 radiate from the shell, those on the back of the neck and back and 



