314 The MoUuscan Family Planorhidae 



PLATE 39 



Menetus 



1-6,9,10. Menetus cooperi callioglyptus (Vanatta). From Quatsino Sound, Vancouver 

 Island, British Columbia; collected by Arthur Peake. Also from Crescent City, 

 California. See plate 38. 



1. Genitalia dissected and organs separated. California specimen. 



2. Head showing form of jiseudobranch. California specimen. 



3. Penial complex in natural position under female complex. British Columbia 



specimen. 



4. Head showing pseudobranch. California specimen. 



5. Penial gland attached to wall of preputium. California specimen. 



6. Seminal vesicle and ovisperm duct. California specimen. 



9. Penial complex showing enlargement of vas deferens as it enters the vergic sac 



to form an epiphallus. Also form of penial gland in preputium. 

 10. Penial complex of specimen badly infested with Trematode worms (flukes). 

 Note peculiar form. British Columbia specimen. 



7,8. Menetus cooperi F. C. Baker {= planulat us Cooper, preoccupied). From Orcas 

 Island, Puget Sound, Washington; collected by Dr. T. Dale Foster. 



7. Penial complex cut open to show verge, penial gland with its short, internal 



duct, enlargement of \as deferens (epiphallus), and position of retractor 

 muscle. 



8. Penial gland in section. 



Line near figure indicates 1 mm. in length. Line above fig. 6 is also 

 for figs. 5 and 8. Line near fig. 9 is also for fig. 7. 



