PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued 



SMITHSONIAN INSTITUTION 



U. S. NATIONAL MUSEUM 



Vol. 90 Washington: 1941 No. 3110 



A NEW HAKPACTICOID COPEPOD FROM THE GILL 

 CHAMBERS OF A MARSH CRAB 



By Arthur G. Humes 



While studying the parasites of crabs at the Louisiana State 

 University Marine Laboratory at Grand Isle, La., the writer col- 

 lected specimens of a previously undescribed copepod belonging to 

 the genus Cancrincola> (Copepoda : Harpacticoida : Ameiridae). This 

 genus was first recognized by Wilson (1913), who designated his 

 newly described species, Cancrincola jamaicensis^ from the gills of 

 the white land crab, Cardisoma guanhiimi Latreille, at INIontego Bay, 

 Jamaica, as genotype. In 1930 Pearse described a second species, 

 Cancrincola ivilsoni, from the gills of the red land crab, Sesarnia 

 haenwtocheir (de Haan), and of the littoral crab, Sesarma pictum 

 (do Haan), at Aburatsubo, near Misaki, Japan. A few specimens 

 of C. jamaicensis Wilson were collected by Pearse (in Wilson, 1935) 

 from the branchial cavity of the spider crab, Microphrys hicornutus 

 (Latreille), at the Dry Tortugas, Fla. The gill chambers of two 

 adult marsh crabs. Sesarma reticulatum (Say), a male and a female, 

 collected at Grand Isle, La., on June 14, 1940, contained about 50 

 copepods, named and described as follows: 



CANCRINCOLA PLUMIPES, new species 



Figure IS 



Type material from the gill chamber of Sesarma ret'widatum, at 

 Grand Isle, La. Holotype, female, U. S. N. M. No. 79317; allotype, 

 U. S. N. M. No. 79348; and 20 paratypes including both sexes, 

 U S. N. M. No. 79349. 



286457—41 379 



