232 



BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



FiGLKE 155. — Gantho- 

 oamptus staphylin- 

 aides; a, Female, 

 dorsal (after 

 Pearse) ; h, female, 

 fifth leg; c, male, 

 fifth leg 



first legs about the same length as the basal endopod segment ; distal 

 segment of fifth legs three-fourths as wide as long, with five setae, 

 the second inner one enlarged and greatly elon- 

 gated; the inner margin also carries two short 

 spines ; basal expansion triangular, with six setae, 

 the second outer one very small. Total length, 

 1-1.15 mm. 



Male. — Fourth and fifth segments of first an- 

 tennae considerably enlarged ; aesthetask on fourth 

 segment just reaching base of end segment ; inner 

 process on middle segment of third endopod slen- 

 der, acuminate, and slightly curved, reaching 

 one-third of its length beyond the tip of the end 

 segment, the latter with two apical setae, the outer 

 one twice the length of the entire ramus; end 

 segment of fourth endopod with a stout spine and 

 two unequal filiform setae at its apex, two shorter 

 filiform setae on its outer margin and three mi- 

 nute spines on its inner margin; distal segment 

 of fifth legs small, with six setae, basal expansion 

 much reduced, with two unequal setae ; rudiments 

 of sixth legs present. Total length, 0.9-1 mm. 

 Re'niai'ks. — Pearse established this species upon material obtained 

 in Nebraska and afterward reported it from Nantucket. 



CANTHOCAMPTUS MINUTUS Claus 



Figure 156 



CantJiocamptus minutus Claus, Die irei lebenden Copepoden, p. 122, pis. 12, 13, 

 1863.— Sabs, Crustacea of Norway, vol. 5, p. 197, pi. 128, 1906. 



Occurrence. — Fifty specimens, including both sexes, were found in 

 wet moss on the shore of Jenkins Pond, Falmouth, July, 1927. 



Distribution. — Sweden (Lilljeborg) ; Germany (Claus) ; Holland 

 (van Breemen) ; British Isles (T. Scott) ; United States (Herrick) ; 

 everywhere in the northern continents (Marsh). 



Color. — Body semitransparent with a faint bluish tinge, becoming 

 white in formalin ; a few scattered red oil globules ; eggs and oviducts 

 white; eye red. 



Female. — Body sublinear, four and one-half times as long as wide; 

 cephalic segment wider but not quite so long as the rest of the meta- 

 some; urosome shorter than metasome and considerably tapered; 

 genital segment completely divided; anal segment evenly rounded 

 posteriorly; anal operculum fringed on its posterior margin with 

 about 12 spinules bifid at their tips and several times longer than 



