HTPSELOSTOMA. 



299 



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

 anfractibiis u, convexis, ultimo tubaui protractam, sursum tortain, 

 altioreni quaui apice, ett'ormante, ad periplucriam valide et obtuse 

 carinato, superne baltea tumida, a periphjeria siilco prof undo 

 separata, munito, subtus couvexo, margine umbilici aperti pcr- 

 spectivi angidato, angulo usque ad aperturam extendente ; apertura 

 horizontali sursum spectaute, 6-7 dentata, deutibus lamelli- 

 formibus duabus parietalibus, supera validiori duplicata, inferiori 

 minore profunda, I columellari mediocri, 4 palatalibus, quarum 

 siiperiori duplic:ita tertiaque raajoribus ; peristomate libero, valde 

 expanso, rellexiusculo. 



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



Hah. Jiurma: Thy et Mio (Dlan ford, Theobald, OhUiam) ; Mya 

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

 {Blanford). 



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

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

 mens seen as •' pale grey ; they bad the eye pedicles rather more 

 elongated than usuafly in species of Ftipa, and more resembling 

 those of fleliv; 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 Anosioma, as iigured by Fischer in 

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



Hypselostoma tvhifenun is the largest and most dejn-essed of the 

 Burmese forms of the genu?. 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 bideutate. 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 nun. 



268. Hypselostoma bensoniauum, Blanford. 



Hijpselodoma hemonianunu Blanford, J. A. S. B. xxxii, 1863, p. 'VIH ; 

 I'feiffer, Men. lielic. Viv. v, 1868, p. 437 ; Hanley & Theobald, 

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

 Viv. 1881, p. 314. 



Pupa {Hypselostoma) bensoni, Xevill, 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 

 flatteneil, 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 



