OPISTIIOSTOMA. 



297 



wliorl, but less so on the others; whorls 5, excentne, the two 

 apical ones verv small and depressed, aud only visible as a single 

 small speck from a side view, the thu-d much larger, convex, the 

 fourth, or penultimate, convex, very large, and much dilated, 

 lowest whorl constricted as usual and in front of the constriction 

 deflected inwards, but not concealing the umbilicus; aperture 

 reversed, circular, quite vertical and parallel with the penultimate 

 whorl • peristome touciiing the centre of the penultimate whorl, 

 double, both lips slightlv dilated, with a broad channel between 

 them : total length yV iocli [1-35 mm.], breadth j\- inch {l'7o inm.J. 



Hub. India: Xallay-Mallay Hills, Kurnool District ; Sivagherry 

 Hills, Tinnevelly District {Beddome). 



" A smaller shell than 0. fctirbanli (Blanf.),und the costulation 

 less protninent ; the two apical whorls are much depressed the 

 penultimate whorl is much larger, the deflection in trout ot the 

 constriction is less sharp, and not, or only partially conceahng the 

 umbilicus ; the i)eristome is more completely double, with a wide 

 space between the two lips ; and the aperture is quite circular. 

 {Beddome.) 



A specimen in my collection, although full-grown, only measures 

 1 mm. in length, 1-25 in breadth, incl. peristome. 



454. Opisthostoma distortum, Beddome. 



Opistho^tuma distortum, WeMome, Proc. Zool. Soe. 1875, p. 445; 

 Theobald, Cat. Shells Brit. India, 1876, Addenda, !>. n : Bteiffer, 

 Mou.Fueum. Suppl. :!, 1870, p. ;39:.^ Xevill, Hand List, i, lb/8, 

 p. 284; Crosse, .lourii. Concbyl. xxvii, 1879, p. 19() : Aucey, 

 \ix\\\. Soc. Malac. France, iv, 1887, p. 274. 

 Opisthostoma {Euopisthostoma) distortum, Kobelt & Molleudortt, 

 Nachr. Beats. Malak. Ges. x.xx, 1898, p. 134 ; id., Cat. Piieum. 



1899, p. 54. , , 1^ n.- -1 



Opisthostoma {Opisthostoma) distortum, Kobelt, Das lierrcicii, 



Lief. Ki, 1902, p. 413. 



Original description:— " SheW irregularly rhomboidal, pale 

 coloured, with an oblique rather distant costulation; whorls 4, 

 e.\cen:ric, the upper one very minute and depressed, not visible 

 from a side view, so that the shell appears as with only three 

 convex \vhorls, second whorl moderate, third or penultima1:e much 

 larger than the second or fourth, lowest whorl constricted as 

 usual, and in front of the constriction deflected upwards, but not 

 concealing the umbilicus; aperture snbangularly circular, pointing 

 upwards, its apex in a line with the apex of the shell; peristome 

 touching the upper part of the penultimate whorl, double, the 

 lips not much dilated and with little space between them : total 

 length -J^ inch [0-9 mm.], greatest breadth -jL inch [1-35 mm.]." 

 (Beddome.) 



Hah. India : Golcondah Hills, Vizagapatam, 3000 ft. {Beddome). 



