UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 18, No. 15, pp. 397-478, plates 17-20, 19 figures in text June 27, 1918 



THE SIGNIFICANCE OF SKELETAL VARIA- 

 TIONS IN THE GENUS PERIDINIUM 



BY 



A. L. BARROWS 



UNIVERSITY OF CALIFORNIA PRESS 

 BERKELEY 



