68 LAND AND FRESHWATER 



DURGELLA DEKHANENSIS, D. sp. (Plate LXXVTII. figS. 1-5.) 



LocaliUj. South iBclia {Colonel R. Beddome). 



Shell very thin, horny, membranaceous, depressedly conoid ; 

 sculpture none ; colour rich sienna-brown ; spire low ; apex flat ; 

 suture shallow^ ; whorls 4 ; aperture widely ovate ; peristome very 

 thin ; columellar margin scarcely thickened, and a very little 

 reflected. 



Size : maj. diam. 18'5, min. 16'0 ; alt. axis 8-0 mm. 



Specimens vary much in size, and, as is usual, also in their 

 coloration. 



Ammal (figs. 2, 2 a) with a narrow foot, sharply keeled behind, a 

 very pointed extremity overhanging the narrow^ linear mucous 

 gland (fig. 2 b). The shell- lobes (fig. 2d) on right and left side are 

 very ample, and must in life almost cover the entire shell ; they are 

 smooth and much paler than the rest of the animal. The neck- 

 lobes are also large and ])ale in colour. The shell-lobe is not 

 continuous round the posterior side of the shell, above the keel of 

 the foot, as in Cryptosoma, but the neck-lobe only is continuous in 

 a narrow fillet or girdle. The coloration differs from («) an indigo- 

 grey throughout to paler gre}', pale ruddy on keel of foot to the 

 overhanging lobe ; (6) pale throughout, with only a dusky tint along 

 the pallial margin ; (c) pale ruddy ochre, with a darkish oblique line 

 on each side of the foot, shaded off above — which may be called var. 

 hicolor (fig. 3). Sole of foot (fig. 2 c) divided into three equal parts, 

 the margins well segmented up to the longitudinal limiting line. 

 Jaw (fig. 4) thin, soft and horny, nearly straight in front. Teeth 

 of radula multitudinous, very minute, bicuspid. 



Generntive organs (fig. 5). The amatorial organ is absent. The 

 penis is a strong plain cylindrical and long muscular sheath, with a 

 very strong retractor muscle, given off where the vas deferens joins ; 

 this last is a wide tube near the junction, rapidly diminishing 

 to a uniform size. The spermatheca rises on a short stem and 

 swells out suddenly into a moderately long, blunt sac. 



DuRGELLA LEviDENsis, n. sp. (Plate LXXVIII. figs. 6-9.) 



Tinevelly Hills, Travancore ( CoZojieZ R. Beddome). 



Shell globose ; sculpture none ; colour pale green and ochraceous 

 spire small, flatly conic ; apex blunt ; suture very shallow. 



Size : myj. diam. 10-5 ; alt. axis 5*5 mm. Length of animal 

 spirit 13'5 mm. 



Its much higher spire, globose form, and smaller size separate 

 from D. del-Jianensis. 



The animal (fig. G) is the same in every respect as the preceding 

 species ; the shell-lobes are very ample. The male organ (fig. 7) is 

 rather short and bulbous ; on opening it down the side (fig. 7 a) it 

 was found to terminate in a round bud-like nipple — one side higher 

 than the other (fig. 7 b). The buccal mass is large and broad, 

 square at the back, with a leathery jaw, quadrate in shape, straight- 

 edged. The lingual ribbon is like that of D. deJchanensis. The 



