102 LAND AND FRESHWATER 



Animal. Sole of the foot not divided, in spirit it is folded on the 

 central line, and under a lens has a similar surface to Eatnadvipia 

 irradians. 



In the odontophore the arrangement of the teeth is as follows : — 



82 . 2 . 19 . 1 . 19 . 2 . 82 

 103 . 1 . 103 



The central tooth has a single cusp on both sides ; the median 

 teeth have a single cusp on the outer side up to the 13th and 14th, 

 when a small notch is seen near the apex on the inner side, and 

 becomes larger and situated lower down as it approaches the 19th 

 tooth. The laterals are all evenly bicuspid. The jaw has a very 

 slight central projection. Mantle as in previously described species 

 of this genus. There is a minute rudiment of the right shell-lobe ; 

 the left dorsal lobe is in two parts, the anterior very close to the 

 posterior. The male organ has a large loop formed by strong 

 connecting muscle a short distance above the generative aperture, 

 attaching the lower part of the muscular caecum at that point. 

 The spermatheca is short and globose. Just above it, at the posterior 

 portion of the vagina, is a globose sAvelliug having a regular folded 

 surface, remarkably well developed, the true function of which 

 requires investigation. A similar protuberance, but not exactly of 

 the same size and shape, may be seen in some other South Indian 

 species, such as AHoj^hanta lo'vipes (Plato LXXX. figs. 5, 5 a), 

 Euphcta ixi)'tita(^\iite LXXX VII. fig. 1), Marudla fZ»ss «»««•«' (Plate 

 XCIII. tig. 1 a), and Nilgiria Ugxdata (Plate XCVIII. fig. 1 c, ot). 

 In the same part of the genitalia I have noticed a similar enlargement 

 in one specimen of NUyiria franquebarica — probably it varies in size 

 with the general seasonal growth of these organs. This I dissected 

 out (Plate XCVIII. figs. 2, 2 a), and on laying open the duct of the 

 vagina lower down and below the swelling of the duct, it is seen to 

 have a rugose lining, and that these rugae within the expanded sac 

 become largely developed so as to almost completely occupy the 

 interior of it. I can only suppose that this elaborate constriction 

 may be a provision for keeping back the ova before contact with the 

 spermatozoa, and we may term this portion the " ovitheca " ; they 

 would further develop here, and pass out gradually : or may it indi- 

 cate a stage in development after the fertilization of the ova, a 

 stage which is carried still further in some species by a long period 

 of embryonic growth, including development of the shell, resulting 

 in ovo-viviparous reproduction ? 



EUPLECTA SHIPLAYI ?, Pfr. 



Heliv shiplayi, Pfr. P. Z. S. 1856, p. 327 ; id. Mon. Hel. vol. iv. 

 p. 39 ; Hanley, Conch. Ind. p. 53, pi. cxxxi. figs. 7, 10 (Bejpur, 

 Anamullay Hills). 



Hotida shiplayi, Theobald, Supp. Cat. p. 21. 



Nanina sMplmji, W. Blf. J. A. S. B. p. 39 (1866) ; Nevill, HaAd- 

 list, p. 31 (Koonoor Ghat, Pulney Hills, and S. Canara), 



Hemiplecta sliiplaDi, Clcssin, Xomen. Helic. p. 50. 



