476 Records of the Indian Museuni. [Vol. XXII > 



Physastra doopi, Prashad (sp. uov.). 

 (Plate xiv, figs. 5, 6). 



The shell is elongate-ovate, subrimate, nearly smooth or with 

 very fine striae ; in the last part of the body-whorl these longitu- 

 dinal and somewhat curved striae are more prominent. There are 

 5^ — 6J somewhat swollen whorls. The suture is very oblique and 

 moderately impressed. The body-whorl is narrowly heart-shaped, 

 with the outer outline markedly sinuate and somewhat emarginate 

 towards the anterior extremity, its antero-external angle is rounded ; 

 the inner outline is evenly but not strongly curved. The mouth is 

 elongate elliptical, extending backwards for more than I of the 

 body-whorl and is two and a half times as long as broad. It is 

 narrowl}' pointed posteriorly, but, owing to the slight recurving 

 of the outer lip in this region, the angulation is quite distinctly 

 visible. The outer lip is sharp and not at all thickened; it is, as 

 noted already, slightly recurved in the upper region. The peri- 

 stome is continuous ; the callus is rather narrow and only slightly 

 thickened ; the columella shows a distinct but rather faint fold 

 near its posterior end. The shell is of a dull brownish colour and 

 the apex is black. 



In some of the specimens the mouth is rather broader and the 

 spire a little shorter. 



Locality. — The eight specimens of this species in the collec- 

 tion were obtained by Mr. den Doop in the valley of the Lau 

 Kling stream (Karo-Batak High Plain near Brastagei). 



Remarks. — The species is allied to P. sumairana (v. Martens), 

 but has the shell comparatively shorter and broader, the spire less 

 elongate, the mouth much less broad and the outer lip thin and 

 only slightly retroverted. The fold of the columella is less deep. 



I have great pleasure in naming this species after Mr. den 

 Doop, to whose careful collecting and keenness is due the great 

 advance in our knowledge of the aquatic fauna of Sumatra. 



Family Ampullariidae. 

 Genus Pachylabra, Swainson. 



1911. Pachvlabra, Kobelt. Martini ami Chemnils Conch. -Cab. , .Am- 

 piiilariidae, pp. 44-46- 

 I have adopted with Kobelt the generic name Pachylabra, 

 Swainson, for the Oriental and African species of the family Am- 

 pullariidae. The genus is distinguished from the American Am- 



