258 The Molluscan Family Planorbidae 



PLATE 11 



Drepanotrema lucidum (Pfciffer) 

 From Havana, Cuba; collected by Dr. C. G. Aguayo. 



1. Head and foot with prepiitium and verge extended from male genital opening. The 



pseudobranch and rectum are also shown. 



2. Head and foot with only preputinm extended from male genital opening. 



3. Genital system dissected and organs separated. 



4. Penial complex showing flagellum, vas deferens, etc. 



5. Penial complex with very long flagellum. 



6. Diagram of penial complex showing preputium and \crge extended from male 



genital opening. 



7. Relationship of vas deferens, flagellum, retractor muscle in body of animal in 



specimen with preputium and verge extended from male opening. 



Line near figure indicates 1 mm. in length 



