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PREFACE. 



The aim of the present paper is to give descriptions 

 of the species of Stalk-eyed Crustacea which are found 

 on the west coast of the United States. For the benefit 

 of students of natural history, who have at present few 

 readily accessible means of identifying the invertebrate 

 animals of this coast, definitions of genera and higher 

 divisions have been inserted, and a description given, 

 in the Introduction, of those parts of the structure of 

 the Decapod Crustacea which are most used for the 

 purpose of classification. The endeavor has been made 

 to enable those who have not previously studied the 

 Crustacea to determine the specific names of the forms 

 here described. The rules of nomenclature of the 

 American Ornithologists' Union have been followed, 

 except in case of the canon, not insisted on by 

 the framers of the code, that specific names derived 

 from the names of persons be written with a small 

 letter. Localities from which I have examined spec- 

 imens have usually been indicated by the note of 

 exclamation, !. 



The larger portion of this paper was completed at the 

 University of California in 1895, but it has received 

 some additions and considerable revision since that 

 date. I wish to express my indebtedness to Prof. Wm. 

 E. Ritter of the University of California for many 

 favors in connection with my work, and to Dr. H. P. 

 Johnson and Dr. F. W. Bancroft for several valuable 

 specimens and for assistance in many other ways. 

 Through the kindness of Dr. Gustav Eisen I have had 



