320 BULLETIN 15 8, UNITED STATES NATIONAL MUSEUM 



with plumose setae only, no spines; sixth-leg rudiments present in 

 the male. Two ovisacs, the eggs smaller and more numerous than 

 in Gyclopina. 



Genotype. — Cyclopinodes elegans (T. Scott). 



Remarks. — This new genus is established for two species, both 

 of which were referred by their authors to the genus Cycloplna., 

 namely Cyclopina elegans T. Scott and C. longieornis Boeck. The 

 accumulated differences noted above are sufficient to warrant the 

 separation of the new genus. Two female copepods with 3-seg- 

 mented fifth legs and evidently belonging to this new genus were 

 washed from the sand on the shore of Katama Bay, Marthas Vine- 

 yard, but both were so badly mutilated as to render any description 

 of them inadvisable. 



Family CYCLOPIDAE 



Genus HALICYCLOPS Norman, 1903 



Body cyclopoid, the metasome considerably depressed ; head fused 

 with the first segment; rostrum turned downward against the ven- 

 tral surface of the head, and hence invisible in dorsal view. Urosome 

 4-segmented in female, 5-segmented in male; anal segment shorter 

 than the one preceding it; caudal rami twice as long as wide and 

 somewhat divergent. First antennae short, 6-segmented, strongly 

 geniculate in the male; second antennae 3-segmented, the exopod 

 obsolete. Rami of the first four pairs of legs 3-segmented, con- 

 siderabl}' broadened and flattened; basal segment of fifth legs more 

 or less fused with the fifth body segment, distal segment lamellar, 

 with four or five plumose setae. One species found here. 



HALICYCLOPS MAGNICEPS (Lilljeborg) 



Figure 191 



Cyclops magniceps Liixjeborg, De crustaceis ex ordinibus tribus : Cladocera, 



Ostracoda et Copepoda, in Scania occurrentibus, p. 204, pi. 22, fig. 1, 1853. 



Ealicijc ops magniceps Sars, Crustacea of Norway, vol. 6, p. 29, pi. 15, 1913. 



Occui^ence. — Female specimens were obtained from three of the 

 brackish ponds on Chappaquiddick Island ; Quisset Pond, Falmouth ; 

 the Mill Pond, Woods Hole; Great Pond, Falmouth; Ice Pond at 

 Quisset; Poucha Pond, Chappaquiddick Island; Nashaquitsa Pond, 

 Marthas Vineyard. Males were found with the females except in 

 two of the brackish ponds and in the last three of the foregoing 

 ponds. 



Distnhution. — Coast of Sweden (Lilljeborg) ; British Isles 

 (Brady, T. Scott) ; coast of France (Canu) ; Algeria (Richard) ; 

 Madeira (Fischer) ; coast of Norway (Sars) ; Poland (Lande) ; 

 New Zealand (Thomson) ; Gulf of Mexico, Pan^-rna (Marsh). 



