256 The Molluscan Family Planorbidae 



PLATE 10 



Drepanotrema hoffmani F. C. Baker 

 From Isabela, Puerto Rico; collected by Dr. W. A. Hoffman. 



1. Animal removed from shell showing pigmentation of mantle, shape of head and 



tentacles, and position of stomach (STM) in body. 



2. Genitalia dissected and organs separated. 



3. Fore part of body showing head, pseudobranch, etc. 



4. Albumen gland showing attachment of ducts. 



5. Penial complex showing attachment of short flagellum, vas deferens, etc. 



6. Section of penial complex showing verge, pilasters, vas deferens, flagellum, etc. 



7. Upper part of penial complex showing relationship of flagellum, vas deferens, vergic 



sac, retractor muscle, etc. 



8. Penial complex of another specimen. 



9. Distal end of verge showing central outlet of sperm canal. 



Line near figure indicates 1 mm. in length 



