252 The Molluscan Family Planorbidae 



PLATE 8 



Intha and Polypylis 



1-8,11. Intha capitis Annandale. From Inle Lake, South Shan State, Burma, India; 

 collected by Dr. N. Annandale. 



1. Outline of albumen gland. 



2. Pseudobranch and rectum. 



3. Head of animal showing tentacles and eyes. 



4. Distal end of verge. 



5. A spermatophore. 



6. Penial complex, dorsal view. 



7. Cross section of penial gland. 



8. Vertical section of penial complex showing verge, gland, and duct. 



11. ^'entral view of entire genitalia, showing the large size of the fiagella. 



9,10. Polypylis hemisphacnda (Benson). Peiping, China; from Fan Memorial In- 

 stitute. 



9. Section of penial complex cut open to show verge, diaphragm and pilasters. 



10. Penial complex, ventral view. Small figure at right shows insertion of vas 

 deferens at junction of vergic sac and flagellum. Dorsal view. 



Line near figure indicates 1 mm. in length. Figures 1, 5, 6. and 7 have 

 same magnification as fig. 11. Figure 4 is greatly enlarged. 



