278 The Molluscan Family Planorbidae 



PLATE 21 



Indoplanorbis exustus (Deshayes) 



From Hsipaw, North Shan State, Burma, India; collected by Dr. B. N. 

 Chopra and Dr. H. S. Rao; contributed by Dr. B. Prashad. 



1. Pcnial complex in natural position. 



2. Fore part of animal showing pseudobranch and pneumostome, with preputium 



protruded from male opening and lying on the neck of the animal. 



3. Genitalia dissected and organs separated. 



4. Pleated pseudobranch and pneumostome. 



5. Under side of preputium everted through male opening in the neck of the animal. 



6. Pseudobranch from side showing branched or pleated condition. 



7. Cross section of ovotestis showing se\'eral gra\id diverticula. 



8. Cross section of prostate. 



9. Two diverticula of prostate. 



10. Portion of prostate showing relationship of vas deferens, sperm duct, and diver- 

 ticula of gland. 



Line near figure indicates 1 mm. in length. Figures 9 and 10 are greatly 



magnified. Figures 1, 2, 3, and 10 were published in 



Jour. Mori)h., LV, plates 1 and 2. 



