NORTH AMERICAN PARASITIC COPEPODS BELONGING TO 

 THE FAMILY CALIGHXE. 



PART L— THE CALIGIN/E. 



Pv Charles Branch Wilson, 



Departmait of Biology, State Normal School, Westjield, Massaclmsetts. 



INTRODUCTION. 



The present is the third paper in the series based upon the collection 

 belonging to the United States National Museum. 



The other two papers treated of the Argulidtt^ and were published, 

 the first in Volume XXV, and the second in Volume XXVI of these 

 Proceedings. Acknowledgment was made in them of valuable assist- 

 ance received from various sources, particularly from the United 

 States Bureau of Fisheries. That assistance concerned the present 

 family even more than the Argulidw, and the author feels that any 

 success which may have been attained in working out the habits and 

 life histories is due almost entirely to the courtesy and assistance 

 extended by the Bureau of Fisheries. 



Additional sources of material will be found mentioned under the 

 historical summary (p. 482). 



This second family, the Caligid{\?, includes about thirty genera, 

 which separate naturally into g-roups difi'ering as much in their habits 

 as in their morphology, and thus constituting well-marked divisions. 

 (See Key on p. 532). 



The genera here treated include all of the first group, the Calig'inje, 

 which have thus far been found in North American waters, and five 

 species, including one which is the type of a new genus, from foreign 

 localities. The North American species are twentj^-three in number, 

 of which thirteen are new, najnely : Cah'gus rujiviacnlatus, C. schist<my;i\ 

 C. nnitdhllis, C. alkincus, C. chelife}\ C. Jatifro)is^ C. hoiiito^ Caligodes 

 megaee2>halus^ LepeophtheirxH lo7igipe><^ L. edwardsi„ L. dlmhmdatus^ 

 L. parvwentris^ L. l)lfurcaUii<. 



Of the five non-American species included in the Museum collection 

 four are new to science, namely, CaHgui^ teres^ from Lota, Chile; Lepe- 

 ophtJieiruK in nom hiatus^ from Cornwall, England; Lepeophtkeh'us 



Proceedings U. S. National Museum, Vol. XXVIII— No. 1404. 



479 



