PROCEEDINGS 



OF THE 



CALIFORNIA ACADEMY OF SCIENCES. 



Third Series. 

 Zoology. Vol. I, No. 10. 



Observations on Monogenesis in 

 Metridium. 



BY 



Harry Beae Torrey. 



With One Plate. 



Issued October 25, 1898. 



SAN FRANCISCO: 



Published bv the Academy. 



189S. 



