158 ZOIS^ITIDiE. 



keeled or subangiilate at the peripheiy, generally rather thin and in 

 typical forms plicate to costulate above, smooth beneath, generally 

 closely wound. 



In the typical species, the only one of which the anatomy has 

 been described, the right shell-lobe is present, but small ; the left 

 dorsal lobe consists of two separate parts. The sole of the foot is 

 distinctly divided into three. The mucous gland, which is wider 

 and overhung by a lobe, does not extend to the sole of the foot. 



Generative organs. The retractor muscle of the penis is peculiarly 

 short and solid and is attached to the flexure of a short free bent 

 caecum, which unites with the main organ at some distance from, 

 the origin of the latter ; the vas deferens joins the penis close to the 

 base of a long, blunt, knobbed kale-sac. Spermatheca long, \vith a 

 bulbous end. Amatorial organ moderately developed. 



Odontojiliore as in MacrocJdamys. The middle tooth of each row 

 has a well-developed cusp on each side ; the inner laterals are 

 bicuspid, having a latei-al cusp on the outer side only ; the outer 

 laterals (marginals) are bicuspid at first, then aculeate towards thw 

 margin. 



Jaw ^ith a median projection. 



The name KhasieUa ^^■as proposed for a small group of snails 

 found in the ranges south of Assam and at the base of the Eastern 

 Himalayas, and which had been referred for some time to Euplecta. 

 The anatomy, however, is nearer to that of Macrocldamys than to 

 that of Enjdecta and Arioplianta, 



A. Imperforate. 



246. Khasiella vidua, H. S^- T. {Blf. MSS.) (Helix) C. I. 1876. pi. 130, 

 fios. 2, 3 ; Gochrin-Auste7i, J. A. S. B. 1876, 2, p. 212 : Blf. 

 (Euplecta) J. A. S. B. 1880, p. 190, pi. 2, fig. 5 ; Godwm-Au^ten 

 (Khasiella), Mol. hid. ii, 1899, p. 129, pi. 100 (anatomy). 

 ? Helix climacterica, var.? nana, Bs. A. M.N. H. (3)"'iii, 1859, 

 p. 392. 



Shell imperforate, conoidly depressed to turbinate, fulvous horny, 

 generally paler beneath, ornamented above with oblique, close, 

 and arcuate filiform costulate striation, smooth beneath with 

 radiating striae ; spire depressedly conoidal to conical, apex rather 

 shai'p, suture impressed ; whorls 8, narrow, convex, slowly in- 

 creasing in size, the last angulate or subangulate at the periphery, 

 scarcely descending, moderately convex below ; aperture oblique, 

 lunate ; peristome white, more or less obtuse, with a very slight 

 thickening inside, the basal margin arcuate, the columellar oblique, 

 gently curved, slightly reflected throughout, more broadly above. 



Major diam. 17, min. 15|, axis 9 mm. 



Hah. The Dafla Hills to north, and Giiro, Khasi, and Naga 

 Hills south of Assam {Masters, Godtvin-Austen) ; Chittagong. 



The conoidly depressed form passes into a turbinate variety, 

 generally smaller. A specimen of this turbinate variety from the 

 Nsiga Hills measures 14, 12i, and 9 mm. in its three diameters. 



