UNIVERSITY OF CALIFORNIA PUBLICATIONS 

 ZOOLOGY 



Vol. 1, No. 5, pp. 171-210, Pis. 17-20 February 20, 1904 



STUDIES ON THE ECOLOGY, MORPHOL- 

 OGY, AND SPECIOLOGY OF THE 

 YOUNG OF SOME ENTEROPNEUSTA 

 OF WESTERN NORTH AMERICA. 



WM. E. RITTER and B. M. DAVIS. 



BERKELEY 



THE UNIVERSITY PRESS 

 PRICE, 50 CENTS 



