viii MEMOIRS OF THE UNIVERSITY OP CALIFORNIA 



Most of all, our work owes its origin and continuance to Professor William 

 E. Tiitter, Director of the Scrij^ps Institution, for it was he who encouraged 

 the beginning of this work many years ago, and has generously fostered its 

 continuance and completion with the facilities and resources of that institution, 

 made possible by the generosity and continued interest of its donors. Miss Ellen 

 S. Scripps and ]\[r. E. W. Scripps. 



Charles At wood Kofoid, 

 Olive Stvezy. 

 Zoological Laboratory, 



Uniyersity of Califobnl\, 



Berkexey, California. 



Transmitted August 30, 1918. 



