218 



L.4ND AND FKESH WATER 



uutil the fourth or fifth whorl. I refer this form to BeBson's 

 U. corys. 



The apex of typical macropleuris (fig. 3, p. 217), it will be seen, 

 is distinctly filose at the suture, even at the third whorl ; and the 

 side of the spire is flatter, very different to figs. 1 & 2. 



The shell from Damsang (figs. 4 & 5), which I consider corys, 

 differs considerably in other characters from macropleuris. In this 

 last the spire is pyramidal, with flat sides, as in Plate CIII. fig. 1 ; 

 in corya (figs. 4 & 5, p. 217) the spire contracts more rapidly above 

 the antepenultimate whorl, and the sides are decidedly concave. The 

 distant costulation is stronger ; the base is flatter ; the columellar 

 margin broader ; the aperture is quadrate and smaller; while the 

 umbilicus is also smaller {vide Henson's description, below). 



Eahula corys, Benson. (Fig. 1, p. 217, type, x 9.) 

 Helix corys, Benson, A. M. N. H. 1859, vol. iii. p. 265. 

 Kalidla (sec. B) corys, Theobald, Suppl. Cat. p. 20. 

 Thysanota corys, Clessiu, Nomen. Helic. p. 82. 



Original description : — " Testa perforata, eloiujato-jyyramidaU, 

 oblique confertim minutissime costulato-stnata, alhida, nan nitente ; 

 spira anguste pyrataidali, apice ohtusiuscido, sntura impressa; an- 

 fractlhus 5^ convexiiiscidis, ultimo ad jicripheriam Jiloso-carinato, bass 

 planiuscula ; apertura obliqua ?, quadrata, longitudine latitudinem 

 cpquante, peristomate temii, recto, margine columellari verticali, longe 

 vix expansiusculo. 



" Diam. 2, long. 3 mill. 



" Habitat in valle llungun [Rungnu], prope Darjiling, rarissime 

 occurrens. 



" A single dead specimen occurred to Mr. W. T. Blanford. This 

 minute shell is of a type allied to the last-described species in form, 

 but is very differently sculptured. Its more pointed, not papillate 

 apex, and the absence of costulation at somewhat remote intervals, 

 and of a marginate suture, through so many whorls, prove that it 

 is not the young of macropleuris. From the clear horn-coloured 

 Helix fastigiata, Hutton, of the Western Himalaya, it may be 

 known by its narrower spire, decided sculpture, minute size, the 

 absence of a marginate suture, and by its perforate base ; and from 

 the dark-coloured H. barraclporensis, Pfr., of the Sikkim Terai, by 

 the first three characters." 



Rahula bascauda, Benson. (Plate CXVII. figs. 1, 1 a, 3, 3 a.) 



Nanina polypleuris, W. Blf. Journ, A. S. B. 1865(Arakan Hills), 

 p. 76. 



Helix bascauda, Bs. A. M. N. H. 1859, ser. 3, vol. iii. p. 186 ; 

 Pfr. Mon. Hel. vol. v. p. 256. 



Helix bascauda, Hanley, Conch. Ind. p. 8, pi. xvi. fig. 1, 



Kaliella (sec. B) , Theob. Suppl. Cat. p. 20. 



Sanina (?) (? = XaniacL jiolypleiiris. Blanford), Nevill. 



