HIGHER CRUSTACEA OF NEW YORK CITY 119 



Besides the descriptions, short notes on the station and mode of 

 life of the species are given and also, for what appear to be the 

 rarer forms, the exact locality where taken. As the whole city has 

 not yet been worked over it is to be remembered that many of the 

 species here assigned to restricted localities will be found wherever 

 the conditions are suitable. 



Many of the cuts in the work have been copied from various 

 papers by Rathbun, Verrill, Harger and others; the remainder of 

 the figures were drawn by the writer. 



The author's thanks are due to Professors Wilson and Dean, for 

 their kindness in offering the use of the laboratory of the department 

 of zoology, Columbia University, and to Professor Crampton for the 

 facilities of the Columbia Laboratory at Bay Shore ; also to Prof. 

 S. J. Holmes who has kindly identified some Amphipoda, and to 

 other zoologists who have given advice and encouragement. 



It is hoped that this catalogue will serve to stimulate the interest 

 in this group of the Crustacea. The writer will be glad to receive 

 notes as to the occurrence of any species, and will be pleased to 

 identify any forms that may be sent to the State Museum. 



DESCRIPTION AND DEFINITION OF THE PHYLUM 



ARTHROPODA 



As a preliminary to the catalogue it may be well to give some 

 definition and explanation of the division to which the class 

 described belongs and of the class itself. This great division, or 

 phylum, is characterized by bilateral symmetry as in the lower 

 phylum, the Annulata or worms, and as in that group the body 

 is divided into segments. An advance over the Annulata, however, 

 is in the presence of jointed appendages attached to the segments 

 and from this circumstance it has received the name Arthropoda 

 (Greek &f6pou" s a joint, -"'J-rfoot). 



The Arthropoda are divided into five classes: 



1 Crustacea, including lobsters, shrimps, crabs, barnacles, water 



fleas etc. 



2 Onychophora, with only one genus, Peripatus 



3 Myriopoda: centipedes and millipedes 



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