NORTH AMERICAN PARASITIC COPEPODS BELONGING TO 

 THE FAMILY CALIGID^. 



PART I.— THE CALIGIN/E. 



By Charles Branch Wilson, 



Department of Biology, State Normal School, Westfield, Massachusetts. 



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 Argulidse 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 Argulidre, 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). 



II i is second family, the Caligidre, includes about thirty genera, 

 which separate naturally into groups differing 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 Caligina?, 

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

 species, including one which is the t} r pe of a new genus, from foreign 

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

 of which thirteen are new, namely: Caligus n/ft'maculatus, C. schistonyx, 

 ('. mutdbiMs, C. aliuncus, C. chelifer, C. latifrons, C honito, Caligodes 

 megacephahiS) Lepeophtheiinx hmy'tpes, L. ed/wardsi, L. dissimulatus, 

 /,. ptirrir, ni ri8 } L. hifurcatus. 



Of the five noii-Ainerican species included in the Museum collection 

 four are new to science, namely. Caligus teres, from Lota, Chile; Lepe- 

 qphtheirus innom/matus, from Cornwall, England; Lepeophtheincs 



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



479 



