132 Messrs. J. C. Melvill and 3. H. Ponsonby on 



it is bent on itself as extracted and mounted, and contained a 

 spermatophore (fig. \h) in a nearly complete stage of formation. 

 The spermatheca is rather short with a globular termination. 

 There is no amatorial organ. The oviduct is of large tube- 

 like form, with a covering very dark in colour, which, under 

 high power, has a granulate appearance. The spermatophore 

 is very interesting ; it consists of a large sac or capsule set 

 on one side with rows, at intervals, of short blunt projections, 

 which possibly mature into sharp spines, as in otiier species, 

 I show a row of these spinules much enlarged (tig. 1 c). 

 Towards the distal end of the kale-sac the capsule decreases 

 in diameter and merges into a long tube filling the kale- 

 sac [k) up to the extreme end. It maybe compared with the 

 spermatophore oi Ariophanta [Xestina) ti-anqueharica, Fabr. 

 (Moll. Ind. ii. p. 135, pi. xciv. figs. 5-5 e), also to that of 

 Euplecta hinoyaensis, G.-A. (pi. xcvii. figs. Ih, 1 c). 



In the radula (tig. 1 d) the centre and admedian teeth are 

 on narrow plates, both have outer basal cusps ; the laterals 

 are bicuspid, the inner points the longest, many of these are 

 seen to have serrated edges below the outer points. The 

 formula is 35 . 17 . 1 . 17 . 35, or 52 . 1 . 52. 



Jaw (fig. 1 e) is concave on the cutting-edge, without any 

 central projection. This radula is quite characteristic of the 

 family Zonitidse. Comparing the animal with those of 

 other genera, I was led at first, by the presence of shell-lobes 

 and general form of the teeth of the radula, to consign this 

 species to the Macrochlamyin^e, but recent and closer exami- 

 nation of the generative organs shows that these differ much 

 from what characterizes that subfamily — in fact, they are 

 distinct from any I have seen hitherto. 



In three characters certainly, perhaps four — viz. : (1) the 

 radula, which has the same formula as Xestina ; (2) the 

 short, small spermatheca ; (3) the spermatophore ; (4) the 

 presence of a straight cgecum of the retractor muscle of the 

 penis (not satisfactorily seen, vide dotted part (r.m.p.) fig. la) , — 

 this species approaches the form of similar parts in the sub- 

 family Ariophantin«. The absence of the amatorial organ is 

 opposed to this. I have never found this organ absent in 

 any of the Indian species of the subfamily. However, I can 

 point to dissimilarity of a like kind occurring in species of the 

 Macrochlamyinse — for instance, in Macrochlamys splendens^ 

 prona, cacharica, and hala. The most important character is 

 the form of the oviduct and the junction of the vas deferens 

 near w^here the albumen-gland would be situated. This 

 would indicate an ovoviviparous habit of the animal not met 

 xvith in any genus of the above-mentioned subfamilies. TJie 



