THE A?^x\ALS 



MAGAZINE OF NATURAL HISTORY. 



[SEVENTH SERIES.] 

 No. 21. SEPTEMBER 1899. 



XIV. — Key to the Isopods of the Pacific Coast of North 

 America, xoith Descriptions of Twenty-two new Species. By 

 Harriet Richardson *. 



The Isopods of tlie Pacific coast of North America have 

 claimed the attention of a number of naturalists during- the 

 last half of the nineteenth century. Among the first to con- 

 tribute to the knowledge of the fauna of that region was 

 Dana. Stimpson also belongs to the earlier part of that 

 period ; his work on the Crustacea and Echinodermata of the 

 Pacific shores of North America, published in 1857, was the 

 first special treatise on the forms of that locality. In con- 

 nexion with the work of tiie later part of the past fifty years, 

 the names of Stuxberg, Lockington, and Harford form one 

 group as contemporaneous workers (1875-76), those of 

 Schiodte and Meinert and Budde-Lund another group 

 (1888-85), while the publications of Dr. Hansen and 

 Dr. Benedict represent the latest (1898) work on the Isopods 

 of that coast. 



The number of species already described is 75, and 22 are 

 added in the present paper. These species represent 44 genera 

 and 16 families f. 



The author has used Dr. Benedict's keys for the genera 

 Synidotea and Arcturus, and is indebted to Professor Sars for 



* From a separate copy from the ' Proceediugs of the United States 

 National Museum,' vol. xxi. pp. 815-869 (1899). 

 t [The index-list of tribes &c. is here omitted.] 



Ann. & May. N. Hist. Ser. 7. Vol. iv. 12 



