Records of the Indian Museum. (Vou. X Vidz, 
3 
Fic. 5.—Genitalia of Pulmonate Molluscs. 
Coen 
\. Genitalia of ZL. bactriana, Hutton. 
B. Genitalia of Limnaea gedrosiana var. rectilabrum, var. nov. 
C. Genitalia of Gyraulus euphraticus, Mousson. 
D. Penis-sheath of same specimen as seen in optical section (further 
enlarged). 
E. Genitalia of Gyraulus convexiusculus (Hutton). 
F. Penis-sheath of Segmentina calathus (Benson) as seen in optical sec- 
tion (X 35). 
