128 University of California Publications in Zoology [Vol. 11 



the headlands. All such stones within two miles of headquarters 

 that were small enough to be turned over, were turned from 

 one to three times in the course of the summer; tide pools and 

 crevices in the rocky beaches received a thorough and continued 

 inspection as far down as the extreme low tide mark. Since 

 several members of the party \tere interested in mites, isopods, 

 nudibranch molluscs, collembola, and pycnogonids, it is evident 

 that our search was minute and careful, as well as somewhat 

 extensive. 



We noticed in 1912 several apparent changes in the fauna 

 of the coast since the preceding summer. Those changes in 

 which a species showed an increase in numbers over the preceding 

 year, are, of course, to be discounted by our increa.sed experience 

 and efficiency as collectors and bj' our better knowledge of the 

 localit.y. On the other hand many forms which we had found to 

 be fairly common the summer previous, were either very rare or 

 apparently completely missing this year. Several Pycnogonida 

 were taken that had escaped our notice the summer before and 

 the notes on these descriptions of the two new species form the 

 body of this paper. 



The key to the Pycnogonida of the West Coast given in this 

 paper is based on that given by Dr. Leon J. Cole (1904). My 

 thanks are also due Dr. Cole for his kindly criticism and valued 

 suggestions in connection with the preparation of this paper. Dr. 

 Cole's type specimens were kindly loaned me for comparison by 

 Professor C. A. Kofoid, and for this and many other favors my 

 thanks are also due him. Dr. Cole's paper is based on the 

 material collected by Professor W. E. Ritter, on the Harriman 

 Alaska Expedition, a few specimens collected by Professor Trevor 

 Kincaid on the Priblof Islands, and collections made at various 

 points along the California coast by Dr. S. J. Holmes and others 

 of the staff of the Department of Zoology of the University of 

 California. The present paper is in a way supplementary to 

 Dr. Cole's, and in it I have endeavored to bring the account of 

 the Pycnogonida of the West Coast of North America up to date. 



