458 succineidyi;. 



reaching nearly to the lower margin of the tooth, the side cusps 

 being subobsolete. The lateral teeth are like the centrals but 

 unsyuunetrical. The marginal teeth are about as wide as high, 

 with one stout, pointed inner cusp, and two short side cusps.'"' 



The genus is confined to Central India, and only two species are 

 knoMii. Although Blant'ord only regarded it as a subgenus of 

 Succinea, I consider, apart from the totally different build of the 

 shell, the presence of an internal furro\\' for a siphon sufficient 

 Marraiit to rank it as a separate genus, as was done by Fischer. 



457. Lithotis rupicola, Blanford. 



Succinea {Lithotis) rupicola, Blanford, A. M.N. H. ser. 3, xii, 

 1863, p. 186, pi. 4, figs. 8-10 ; Nevill, Hand List, i, 1878, 

 p. 214. 



Succinea rupicola, Pfeifier, Novit. Conch, ser. 1, iv, 1871, p. 11, 

 pi. 112, figs. 1-4; ibid., Mon. Helic. Viv. vii, 187G, p. 35. 



Lithotis 7-npicohi, Bland & Binney, Anu. Lye. Nat. Hist. New 

 York, X, 1874, p. 349 (jaw and lingual dentition, description) ; 

 Binnej-, Proc. Acad. Nat. Sci. Philadelphia, 1874, p. 54, pi. 5, 

 fig:s. 3-6 (jaw and lingual dentition, figures) ; Hanley & Theo- 

 bald, Conch. Ind. 1874, pi. 81, fig. 7 ; Pfeiifer & Clessin, Nomencl. 

 Helic. Viv. 1881, p. 231 ; Trvon, .Struct. Svst. Conch, iii, 1884, 

 p. 88, pi. 100, fig. 40. 



Oriijinal description: — "Testa ovata, pertenuis, succinea, cur- 

 vate costulato-striata ; spira plana, sutiira vix depressa ; anfracti- 

 bus 1|, ultimo prope aperturam descendente ; carina ex apice 

 oriens, spiralis, peristoinatis ad marginem dextrum, 2 mm. a 

 sutura, desinens ; apertura permagna, ovafa, continua, intus 

 politissima, nitida ; peristomate tenue, rectum, margine columei- 

 lari callose appresso. 



" Diam. niaj. 7 mill., min. 5, alt. 2^." (Blanford.) 



Hah. India : Western Grhats ; Khandala (Blanford). 



" Couibines the characters of Camp)toi\yx and Otina, belonging 

 to the Aurimlacea, with those of Snccinea and its allies. From 

 the shell alone, which has the form of Otina, with the substance, 

 texture, and peculiar external ridge and internal furrow of Camj>- 

 tony.v, I should liave supposed the present species to belong to the 

 last named genus ; but the retractile eye-bearing peduncles prove 

 its place to be in the neighbourhood of 8uccinea, from which 

 genus the internal furrow for a siphon distinguishes it as a well- 

 marked subgenus. Tentacles are extremely small and rvidimentary 

 in several of the subgenera of Succinea, and, in the present case, 

 appear to be wanting ; if present, they are certainly very incon- 

 spicuous. The animal of Helisir/a, Less., as represented in Adams, 

 Gen. Eec. Moll. pi. 73, closely resembles that of Lithotis, but has 

 a larger foot, while the shell only differs in the absence of the 

 siphonal furrow. 

 " Lithotis nhounds adhering to the precipitous basaltic rocks of the 



