316 The Molluscan Family Plauorhidae 



PLATE 40 



Menetus 



3-5, 7, 9, 12. Menetus dilatatus (Gould). From pond in field near Unionville, Connecti- 

 cut; collected b.y F. C. Baker and Leslie Brewer. Also from Hyannis, Massa- 

 chusetts; collected by F. C. Baker. 



3. Penial complex with preputium pushed u]>waid. 



4. Penial complex in natural position, the preputium inflated. 



5. Penial complex shown in fig. 4 cut open to show position of verge and i)enial 



gland. 



7. Pseudobranch of specimen from Hyannis, Massachusetts. A broad form. 

 9. Pseudobranch of specimen from Union\iIle. 



12. Genitalia dissected and organs separated. Small specimen shows re\erse side 

 of prostate and vas deferens. 



1,2,6,8, 10, 11. Menetus sampsoni (Ancey). From six miles northeast of Dallas, Texas; 

 collected by Dr. E. P. Cheatum. Also from Meremac River, near Stanton, 

 Missouri; collected by Leslie Hubricht. 



1. Ovisperm duct and seminal vesicle. Missouri specimen. 



2. Penial gland. Texas specimen. 



6. Diverticulum of ovotestis with ova in upper part. Texas specimen. 



8. Pseudobranch in cylindrical form. Texas specimen. 



10. Penial complex cut open to show verge and form of i)enial gland. Texas 



specimen. 



11. External view of penial complex. Texas form. 



Line at left of fig. 12 equals 1 mm. in length. Line at right of fig. 10 

 equals 0.5 mm. in length. All figures are greatly enlarged. 



