HTPSELOSTOMA. 299 



conica, sutura excavata, spira breviter conoidea, apice obtusiusculo ; 

 anfractibus 3, convexis, ultimo tubain protractain, sursum tortam, 

 altiorem quam apice, efformante, ad periphseriain valide et obtuse 

 carinato, superne baltea tumida, a periphaeria sulco prof undo 

 separata, rnunito, subtus convexo, margine umbilici aperti per- 

 spectivi angulato, angulo usque ad aperturam extendente ; apertura 

 horizontali sursum spectante, 6-7 dentata, dentibus lamelli- 

 formibus duabus parietalibus, supera validiori duplicata, inferiori 

 minore profunda, 1 coluinellari mediocri, 4 palatalibus, quarum 

 superiori duplicata tertiaque majoribus ; peristomate libero, valde 

 expanso, reflexiusculo, 



"Diam. maj. 4, min. 3, axis 2 mill." (Benson.) 



ffab. Burma : Thyet Mio (Blanford, Theobald, OlcUiam) ; Mya 

 Leit Doung, Tsagyen Hills, and Pegu as far south as Henzada 

 (Blanford). 



The animal of H. tubiferum has been observed both by Blanford 

 and Stoliczka. The latter gave a figure and described the speci- 

 mens seen as " pale grey ; they had the eye pedicles rather more 

 elongated than usually in species of Pupa, and more resembling 

 those of Helix; the tentacles at the base of the rostrum were 

 very minute, both blackish. The rostrum itself is thick and very 

 minutely notched at the front edge. The foot is short, ovately 

 elongated, roundly truncate posteriorly. The animal, when 

 moving, carries its shell in a reverse position. On the whole it 

 greatly resembles that of Anostoma, as figured by Fischer in 

 Journ. de Conch, for 1869, vol. ix, pi. xi, figs. 1, 2."" 



Hypselostoma tubiferum is the largest and most depressed of the 

 Burmese forms of the genus. It is, moreover, readily separated 

 from its congeners by the aperture being horizontal and on a 

 level with the spire. The parietal entering lamellae are some- 

 times bidentate. The species appears to be fairly common and 

 occurs in many collections. Some specimens in the Cuming and 

 Theobald collections are somewhat larger than the type, measuring: 

 major diam. 4'25, minor 3'10, alt. 3*5 mm. 



268. Hypselostoma bensonianum, Blanford. 



Hypselostoma bensonianum^ Blanford, J. A. S. B. xxxii, 1863, p. 326 ; 

 Pfeiffer, Mon. Helic. Viv. v, 1868, p. 437 ; Hanley & Theobald, 

 Conch. Ind. 1870, pi. 8, fig. 2; Pfeiffer & Clessin, Nomencl. Helic. 

 Viv. 1881, p. 344. 



Pupa (Hypselostoma) bensoni, Nevill, Hand List, i, 1878, p. 193. 



Original description : "Shell moderately umbilicated, turbinate, 

 not distinctly striated, thin, horny. Spire conical, apex papillar 

 and with the axis oblique, suture deep. Whorls 4, the upper ones 

 flattened, the last bulging below the suture, and again at the 

 periphery (where it bears a prominent rounded keel), rounded 

 beneath, and compressed towards the umbilicus. It rises some- 

 what towards the mouth, which is round, nearly vertical, 

 slightly turned upwards, free from the other whorls, and furnished 



