REE POR’ -O,Ne st, SERGE SEW. sAcsiesis ae 
GAS ROP © DM OL CrSiGsm Olr 
LOWER MESOPOTAMIA. 
ParT IIJ.—TuHe Faminies NERITIDAR, HyDROBIIDAE 
AND MELANIIDAE. 
By B. Prasuap, D.Sc., Assistant Superintendent, 
Zoological Survey of India. 
Since the publication of the first two parts of this series, the 
Indian Museum has received a valuable collection of Mesopota- 
mian molluscs from Dr. KF. W. Bowell, made by him at Basra 
during August I917—February 1919, and placed with great 
generosity at our disposal. This collection, together with the 
collections mentioned in the previous parts of this report has 
rendered the working out of the Mesopotamian molluscs much 
easier and more satisfactory. Specimens of the families reported 
cn in the first two parts of the report are also represented in this 
collection, but these do not offer any specially interesting points 
for further discussion. They belong to the following species :— 
Limnaea tenera ewphratica. Gyraulus convexiusculus.' 
Limnaea peregra canalifera. Gyraulus euphraticus. 
Bullinus contortus. Gyraulus intermixtus. 
The only point to be noted in reference to these is that the 
large series of L. peregra canalifera exhibits much greater indivi- 
dual variability than the specimens previously examined. 
Family NERITIDAE. 
Genus Neritina, Lamarck. 
Subgenus Dostia, Gray. 
1919. Dostia, Annandale and Prashad, Rec. Jud. Mus., XVI, pp. 
2ZAZ, 243 
In the paper cited above Dr. Annandale and I considered 
Dostia, Gray, as distinct from Neriztina, Lamarck, but asa result of 
further examination of the rich collections in the Indian Museum 
I am inclined to consider it as worthy of subgeneric rank only. 
! We would invite attention to the fact that there has been an unfortunate 
transposition of lettering in reference to Gyraulus euphraticus and Segmentina 
calathus in fig. 5 on page 40 of this volume. The figure D refers to the Seg- 
mentina and the figure F to the Gyraulus. [N. A. and B. P.}. 
