146 



Records of the Indian Museum. 



[Vol. XVI, 



Satara and Poona districts. Thej^ are M . iuberculata and M. 

 scabra, perhaps the two commonest and the most widely distribu- 

 ted of the Indian species. 



Melania tuberculata (Miiller). 

 (Plate V, fig. 5). 



1918. Melania tuberculata, Annandale, Rec. huh Mus. XI\', pp. 114, 

 1 15, pi. xii, figs. I, 2. 



In the paper cited one of us has recently discussed the varia- 

 tion and plasticity of the species. Shells from the Yenna River 

 are of the typical form but pale in colour, with the reddish mark- 

 ings very conspicuous. Specimens from the Igatpuri I^ake, an 

 artificial reservoir situated at about the same altitude in the Nasik 

 district, are a little stouter and have the sculpture deeper ; they 

 are as a rule still paler and have the reddish marks even more 

 conspicuous, but there is a tendenc}' for the older whorls to be 

 blackened. Several individuals of a dwarfed type Avere found 

 living in a small ditch at Khandalla with L. acuminata var nana, 

 they resemble the form from the pools of brackish water at Port 

 Canning figured (fig. 6/ ) in the paper cited above. They are 

 darker in colour than others from the same district, but this 

 appears to be due largely to a deposit formed on their surface. 

 Most of the Medha shells are not more than 25 mm. long, but 

 occasionally larger individuals of a somewhat more elongate t^^pe 

 occur. 



We give measurements of the largest shells from each of the 

 three localities ; none of them are much eroded. 



We figure the radular teeth (fig. 5, pi. v) of a specimen from 

 Igatpuri. The}^ are of the type normal in the genus, and differ 

 (according to Heude's figure) from those of M. jacquetiana, Heude," 

 a closely allied species if not a mere variety from China, in hav- 

 ing more numerous denticulations on the central tooth. They 

 also show minor differences from Jickeli's figure of a North 

 African specimen.* 



The species was found with M . scabra in the Yenna River 

 on mud in still pools. It was particularly abundant on shelves of 

 rock covered with mud. 



' Heude; Mem. Hist. Nat. C/iinois, 1. Mo/l. D'Eau Douce, p. [63, pi. xliii, 

 fig. 5;' (1890). 



^ Jickeli, iV. ,4. A'. Leop-Carol. Ak. Xaturf. XX.WII 1 n, pi. iii, fis^-. 7 

 (1874). 



