164 ZONITIIWE. 



last not descending, sharply carinate, compressedly at the base, 

 flatly convex beneath, hollowed around the umbilicus ; aperture 

 diagonal, angulately lunate ; peristome thin, columellar margin 

 oblique, coming forward and slightly expanded around the 

 umbilicus. 



Major diaui. 13J, min. 13, height 7^ mm. 



ffab. Dakhinkhund, Bari Doab, Western Himalayas (J. & 

 Smithe), between Dalhouse and Chamba (Theobald\ 



A larger variety was obtained by Theobald on the hills 

 behind Aijas, east of the Walar Lake, Kashmir : this measures 

 17| X 16| x 10 mm. The shell, as both Benson and Theobald 

 notice, resembles the Nilgiri Thysanota guerini, but, as the latter 

 also observed, the animal is a Zonitid. 



[Original description of the animal : " On removing the shell 

 the visceral sac is pale-coloured, sparsely and finely spotted with 

 black on the line of the rectum. The foot is short and very narrow, 

 indistinctly divided, dark grey ; a distinct mucous gland overhung 

 by a blunt lobe, peripodial grooves, and a well-marked fringed 

 margin to the foot. There is a small but distinct and serrated 

 right shell-lobe, which would spread further in life ; the left is a 

 marginal band on the edge of the peristome. The generative 

 organs were of great interest as they were unfolded. The amatorial 

 organ is of the usual form ; the penis retractor muscle given off 

 from a distinctly coiled caecum at the head of the main penis- 

 sheath. There is a long epiphallus thence to the junction of the vas 

 deferens, with a long kale-sac adjacent, in which a sperm atophore 

 had been developing. The spermatheca is very long, gradually 

 enlarging to the distal end, and contained three spermatophores ; 

 these are of the type I have described in various species of Macro- 

 chlamys, Austenia, &c. The flume had no large spines, but very 

 minute ones could be detected on the edges of it. The oviduct is 

 peculiar, very straight up to the albumen-gland, so was the line of 

 the prostate. 



"The jaw is strong and solid, slightly arched into a central 

 projection. 



" The radula has the formula 



18 . 2 . 9 . 1 . 9 . 2 . 18 

 29 . 1 . 29 



"The teeth are of the usual form in so many genera of the Zoni- 

 tida3, the laterals being bicuspid, with the outer cusp below the 

 inner, becoming very small on the margin." 



Compared with the type of Khasiella, there is (l)the same small 

 obscure right shell-lobe ; (2) the same form of foot and mucous 

 gland ; (3) the jaw and radula are precisely alike; (4) the generative 

 organs differ in no appreciable way, merely that the short free 

 ca3cum retractoris penis of K. vidua becomes a close-wound coil in 

 K. Jiyba. The shells of these two species present at first sight 

 considerable differences, but the variation becomes less apparent 



