260 The Molhiscan Family Plauorhidae 



PLATE 12 



Tropicorbis havanensis (Pfeiffer) 

 From Xew Orleans, La.; collected by Dr. E. Carroll Faust. 



1. Penial complex in section to show verge and pilasters in vergic sac. 



2. Muscular ring or ridge between vergic sac and preputium (diaphragm). 



3. Distal end of verge showing central opening of sperm canal. 



4. Body of snail showing pseudobranch, pneumostome, rectum, and frilled ridge or 



crest over rectum. 



5. Body of snail showing pigmentation of mantle. 



6. Albumen gland from above. 



7. Portion of genitalia at junction of oviduct and sperm duct with ovisperm duct. 



Also entrance of albumen duct into carrefour and thence to oviduct. From below. 



8. Same as fig. 7, from above. 



9. Single diverticulum of prostate showing canal distinct from that of sperm duct. 



10. Penial complex showing enlargement of preputial sac. 



11. Genitalia dissected and the organs separated, showing relationship of all organs. 



Line near figure indicates 1 mm. in length. Lme at left of fig. 1 is also 

 for figs. 7, 8, and 9. Line at left of fig. 11 is also size for fig. 6. 



