186 ZONITIDiE. 



shows an approach to MacroMamys ; yet again in this connection 

 there is also a well-developed kale-sac or flagellum at the point of 

 junction of the vas deferens. The amatorial organ is short and 

 blunt at the outer end ; in this respect it is like that seen in the 

 genitalia of Austenia planospira. The spermatheca is apparently 

 long, only a part, perhaps half, is left, a portion having been 

 broken off in dissection. 



The jaw was arched, solid, and ^ith a strong central projection. 



The radula has the formula : 



25 . 16 . 1 . 16 . 25 

 41 . 1 . 41 



The teeth are similar in form to those of C. bensoni of Calcutta^ 

 the outer cusp lying low down, up to the extreme marginals.] 



[283. Cryptaustenia silcharensis, Godivin- Austen (Austenia), Mol. 

 Ind. ii, 1907, p. 170, jil. 107, figs. 1-3 c (shell, animal, and 

 anatomy). 



Locality. Near Silchar, Cachar {F. Ede). 



Shell. The description of C. bensoni will apply generally. It is 

 bright and shining, of a straw-colour. Three whorls, these are 

 flatter above than in that species, making the aperture wider 

 horizontally to the axis ; viewed from above, the last whorl spreads 

 and widens outwards as it nears the aperture. 



Size : maj. diam. 0*95, alt. axis 0"35 mm. 



Animal. Preserved in spirit is pale vinous, greyer on the shell- 

 lobes ; on the side of the foot, just above the peripodial groove, are 

 a series of isolated dark blotches. The foot is long behind, narrow 

 compressed at the sides, and terminating in a long hooked point 

 overhanging the narrow slit of the mucous gland. The sole is 

 very distinctly divided. The peripodial groove and margin not 

 so distinctly marked as in some species. The right and left shell- 

 lobes are remarkably developed, particularly the former ; broad 

 and expanding, in life evidently covering the whole shell, they 

 have a beautiful papillate surface. The length of this specimen 

 (contracted) is 2-25 mm. 



Genitalia. The amatorial organ is long and cylindrical, tapering 

 gradually to the retractor muscle. The penis is bent sharply 

 ■where the long retractor muscle is given oif, then there is a short 

 swollen part where the spermatophore would be formed, and this 

 narrows to the vas deferens. The spermatheca is moderately 

 long. 



The jaw has a central projection. 



The radula has the formula: 



52 . 2 . 10 . 1 . 10 . 2 . 52 

 64 . 1 . 64 



Similar to that of C. bensoni, and the teeth are of the same 

 tricuspid type shown in plate 38, fig. 2, vol. i, Mol. Ind.] 



