IBYCUS. 219 



being conoid, of 34 to 4 whorls, and the Sarasius do not describe the 

 internal anatomy, which may prove very different from Ihycus. I 

 give figures of the radula of both Leptodontarion albacuminatus and 

 L. coriaceus (fig. 76, D, E, p. 220). Leptodontarion should be 

 included in the subfamily DurgelUncn.'] 



327. Ibycus fissidens, Heynemann, Med. Blatt. x, 18G2, p. 142, pi. 1, 



tig. 3 (radula). 

 [ Vide fig-. 70, C, p. 220.] 



Shell imperfect, convex, horny-leathery, bi'ittle, translucent, 

 amber-coloured, highly polislied, with neat lines of growth. It is 

 shovel-shaped, with the apical portion wanting, and may be part of 

 a shell like that of Girasia. 



The breathing-orifice appears to lie far forward. A mantle 

 covers the anterior half of the body and, as in Limax, is united 

 with the sole. Surface of the mantle distinctly tubercular. Jaw 

 with a prominent centre. 



Radula as described under the genus. No size mentioned. 

 The shell, if figured of natural size, may have been half an inch 

 long, and the whole animal possibly 2 inches, but this is un- 

 certain. 



Bab. Sikhim, at a height of 5600 feet (ScMagintiveit). It should 

 be remembered that some of the Schlagintweit collections, from 

 Sikhim especially, were wrongly labelled. 



328. Ibycus minutUS, Godioiji-Austen (Helicarion), J. A. S. B. 1876, 



2, p. 313, pi. S, fig. 1 ; id. (Uurgella) Mol. hid. i, 1883, p. 144, 

 pi. 39, figs. 1-6 (shell, animal, radula, &c.). 

 [Vide fig. 76, A- A 5, p. 220.] 



Shell imperforate, depressed, ovate, translucent, smooth, polished, 

 lower portion membranaceous, brownish with an olive tinge ; 

 spire nearly flat, suture impressed ; whorls 2|, rapidly increasing, 

 the last rounded at periphery, slightly flattened beneath ; aperture 

 very oblique, diagonal, lunate, roundly ovate ; peristome thin, 

 max'gins converging, columellar above slightly inclined to the right. 



Major diam. 7, min. 5, height 3 mm. 



Hah. Under Toruputu Peak, Dafla Hills, also Jaintia Hills and 

 Noa Dehing, Assam {Godivln- Austen). 



Animal, when alive, pale horny ; tentacles and line from them 

 to the mantle dark-coloured, also a dark line down the upper 

 surface of the foot behind the mantle. Lobes of mantle just 

 covering the edge of the shell. The anterior portion of the body 

 is much shorter than the posterior portion. Total length about 

 0"7 inch. A well-marked hooked process above the mucous 

 gland. The middle portion of the sole of the foot is black 

 throughout. 



Radula with a straight unicuspid rhachidian tooth, increasing in 

 width near the base, and numerous curved lateral bicuspid teeth, 

 similar in form to each other and gradually decreasing in size as 

 they are inclined backwards on each side of the central tooth. 

 There is thus a very considerable likeness to the arrangement in 



