UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. II, No. 9, pp. 173-180, pi. 9 November 26, 1913 



ON SOME CALIFORNIAN SCHIZOPODA 



H. J. HANSEN 



In his valuable work, "Synopsis of California Stalk-eyed 

 Crustacea," Holmes (1900) established or redescribed a number 

 of Schizopoda, among which were two specie-s of the genus 

 Thysanoessa. When I began to write a preliminary account of 

 all the genera and species hitherto captured of the Euphausiacea 

 I applied to the University of California, asking for the loan of 

 the material in their collections of the Euphausiacea, together 

 with specimens of some of the species of Mysidacea established 

 by Holmes (1900). Dr. C. A. Kofoid most benevolently sent 

 me what he could. I obtained specimens of the two species of 

 Thysanoessa described by Holmes (1900), some material taken 

 in stomachs of the salmon, and specimens of some of Professor 

 Holmes 's Mysidacea. The specimens from salmon stomachs were 

 taken in Alaska, and were collected by Mr. P. M. Chamberlain 

 of the United States Bureau of Fisheries. Permission to use this 

 material has kindly been granted by Dr. H. M. Smith, United 

 States Commi.ssioner of Fish and Fisheries. 



On the following pages I list the species of the collection and 

 I redescribe to a certain degree three of them. The descriptions 

 of Holmes are on the whole good as far as they go, but in later 

 years I have seen so many species of the genera in question that 

 I find it necessary to point out some features of special import- 

 ance for the recognition and classification of these species from 

 California. 



DECi^ 



