MOLLUSCA OF IXDIA. 



51 



kong, and this proves in almost every main character to be similar 

 to the typical species. Other species will no doubt be found in 

 the intermediate countries of Annara, Tonquin, &c. 



I should not be at all surprised if Helicarion loivi, De Morgan, 

 from Perak, is closely related ; and it will also be interesting, when 

 the animal of Helicarion ivhiteheadi, G.-A., from Borneo, comes to 

 be examined, to see whether it will be included in this genus. 



The first species now described was obtained about 300 miles to 

 the N.E. of Moulmain. 



Cryptosoma inusitattjm, n. sp. (Plate LXX. figs. 1-8.) 

 Hub. Eastern Burmah {Colonel Woodthorpe, 1894). 

 Shell (figs. 1, 1«) giobosely ovoid, fragile, with shiny surface; 

 sculpture quite smooth, crossed by undulating lines of growth ; 

 colour dark reddish brown ; spire low, apex blunt, scarcely rising 

 above the last whorl ; suture well marked ; whorls 2i, the last very 

 ample; aperture very broadly lunate, oblique, inside white and 

 nacreous ; peristome very thin, scarcely reflected, columellar margin 

 rounded. 



Size : major diam. 29-5, minor diam. 22-0, alt. axis 12-0 mm. 

 ^ ; j ,, 27-0 „ 20-0 „ 11-0 „ 



Largestsp. ^^.^ 19.5 ^^ iQ-Q „ 



Anhmd (fig. 3). The shell-lobes as in C. pra^stanx, the left over- 

 lapping the edge of the peristome with a nearly equal breadth. It 

 is conspicuously covered with large oval or circular flat tubercles, 

 intermixed with smaller, some pale-coloured, others black, presenting 

 a very mottled appearance. The neck-lobe is much smoother, but 

 speckled ; the sides of the foot have here and there oblong dark 

 spots. 



Generative organs (fig. 7). The amatorial organ is a remarkably 

 laro-e, long, cylindrical mass, and differs from all the species I have 

 exam'ined in being attached by strong muscles for nearly its whole 

 length to the right-hand side of the body from the generative 

 aperture backwards, and has also a short strong retractor muscle at 

 the posterior end, the position of the attachment being near the 

 hepatic duct. 



In this species this organ possesses great prehensile and retractile 

 power. The analogue of the dart, which runs up the central axis, 

 is a muscular hard-pointed rod, and was found protruding about 

 5 mm. outside the generative aperture (figs. 7 6, 7 c). The male 

 organ has a kalk-sac just behind the junction of the vas deferens ; 

 it ''there bends on itself with a strong diverticulum, whence is 

 given off the retractor muscle ; the anterior rod has a blunt knob ; 

 the spermatheca {sp.) unfortunately came to pieces on dissection, 

 and could not be drawn with certainty, but it was elongate in form ; 

 the albumen-gland (fig. 7 a) was flattened and ovate, composed of 

 four very distinct segments, the hermaphrodite duct very much 

 convoluted. The buccal mass (fig. 4) is short and globose behind ; 



