iq2i.] B. Prashad : Suniattan Molluscs. 483. 



Vivipara hendrlci, Prashad (sp. uov.). 

 (Plate xiv, figs. 7-10). 



This new species, though closely allied to V.javanica, appears 

 to be quite distinct, and is here described under the name V . hen- 

 drici after the name of Mr. den Doop's father. 



The shell is of a large size and rather thick in texture, l It is 

 narrowl}' rimate, with the spire elongate and the body- whorl 

 somewhat swollen. The whorls of the spire are a little oblique 

 and only moderately swollen, they increase gradually in size. The 

 suture is oblique, r.ither narrow, but fairly impressed. The body- 

 whorl, as seen in dorsal view, is band-shaped, increasing gradually 

 but not very greath^ towards the end; near the periphery there 

 is no angulation in the adult shells, but traces of it are to be 

 seen in shells of moderate size ; it is not very much swollen. The 

 mouth is fairly large, subcircular, bluntly p:3inted above and 

 bioadly rounded below. The outer lip is thin and irregularly 

 arched. The columella is narrow and slightly curved but without 

 any fold. The peristome is complete. Tlie colour of the shell is 

 uniform dark olive-green in fresh shells, but rather brownish in 

 those covered with a deposit. The first three whorls, in some 

 specimens, also show 2-3 transverse bands of a darker colour. 

 The margin of the mouth is blackish, while the interior of the 

 shell is light blue. The sculpture consists of fairly coarse longitu- 

 dinal curved striae crossed by a few transverse ones ; the latter 

 are all more conspicuous on the bod3^-whorl than on the rest of the 

 shell. 



The operculum is dark brownish or even black ; it is large , 

 ovoidal, thick but somewhat brittle. Externally only a few con- 

 centric striae can be made out, but the nucleus is excentrically 

 situated. There is on the inner surface a well marked muscular 

 scar with raised subcircular boss Iviii::; near the left margin ; the 

 «car shows thick vermicular ridges on its surface. 



Measurements of shells {in millimetres). 



I (Type) 

 Length of shell ... 31 



Maximum breadth . 20'S 



Height of spire (dorsal view) 1 4 

 Height of mouth ... 16 



Breadih of mouth ... 13'2 



Locality. — A few adults of this species were collected in the 

 Bah Endah (streamlet) by Mr. den Doop. 



Family Hydrobiidae. 



Genus Bithynia, Leach. 



Only a single representative of the familv Hydrobiidae is re- 

 presented in the collection. This might to some extent be due to 

 the minute size of the shells of the members of this family. 



