224 Records of the Indian Museum. [Vo1. XVIII, 
At the end of his description of the species he adds the 
following: ‘‘ D’aprés la forme de ]’ouverture et surtout du bord, 
que est obtus a sa terminaison, je considére cette espéce comme 
une Bythinie, bien que l’opercule manque et que sa petitesse 
rappelle plut6t les Amnicoles.’’ It is clear from this quotation 
that Mousson was not quite definite about the generic position 
of his form. ‘The specimens before me, however, leave no doubt 
that the species B. ejecta, Mousson, as was considered by Dr. 
Annandale, is not a member of the genus Bithynia, Gray, but 
belongs to our new subgenus Alocinma. 
Bo 
Fic. 2.—Ammnicola (Alocinma) ejecta (Mousson) from the banks of the 
Euphrates at Nasiriyeh. 
Family MELANIIDAE. 
Genus Melanoides, Olivier. 
Melanoides tuberculata (Miller). 
1874. Melania tuberculata, Mousson, op. cit., pp. 47, 48. 
1887. Melania tuberculata, Schepmann and Snellmann, Moll. iz Veth. 
Mid.-Sum. Reiz. Ind. Sumatra-Exped., pp. 16, 17, pl. it, 
fig. 11 (radula). 
1919. Melanoides tuberculata, Annandale and Prashad, Rec. Ind. Mus., 
OV TT pp: 3,325 pl. vi, fig. 1. 
In the paper cited above Dr. Annandale and I have given the 
diagnostic characters of this widely distributed and very variable 
species. The radula of the mollusc had been figured by us pre- 
viously in another paper.! Schepmann had previously figured and 
described the radula of the Sumatran form in the obscure publica- 
tion cited above. The two differ from one another, but the 
differences are more apparent than real, being due mainly to 
different views of the teeth having been figured; other differences 
in the number of denticulations are only of the nature of a varia- 
tion exhibited by the species. 
1 Annandale and Prashad, Rec. Jnd. Mus., XVI, p. 146, pl. v, fig. 5 (1919). 
