308 The Molluscan Faiyiily Planorbidae 



PLATE 36 



Parapholyx 



1-9,11,12. Parapholyx ej]usa klamathcnsis F. C. Baker. From Upper Klamath Lake, 

 Oregon; collected by J. Henderson. 



1. Whole animal removed from shell. 



2. Pseudobranch and related organs. 



3. Genitalia dissected and organs separated. 



4. Cross section of prostate, uterus, and nidamental gland. 



5. Cross section of ovotestis about midway of its length. 



6. Cross section of ovotestis toward posterior end. 



7. Penial complex showing retractor muscles and short penial gland duct. 



8. Penial complex showing nerve and blood vessels. 



9. Penial complex cut open to show verge and penial gland with its short duct. 



At X gland is cut open to show canal. 



11. Section of penial gland showing pipe-like cup and canal. 



12. Verge showing central position of exit for the sperm canal. 



10. Parapholyx cffusa diagonalis J. Henderson. From Crater Lake, Oregon; collected 

 by J. Henderson. 

 10. Vergic sac and upper part of preputium showing \-erge, muscular ring or dia- 

 phragm, and entrance of penial gland duct into diaphragm. 



Line near figure indicates 1 mm. in length 



