SOUTHERN CALIFORNIA ACADEMY OF SCIENCES. 55 



A part of a gonad from a mature Pecten showing the 

 sperm gland. 



The gonad from a young Pecten showing both the 

 ova and sperm glands. 



A part of a gonad from a mature Pecten showing the 

 ova glan(p| 



A dividing cell from the gonad of ihe Pecten, found 

 on the liver. 



