THE CRUSTACEA OF NEW JERSEY. 127 



thorax and eg^g-pouches on the red color of the gills. The 

 length of the parasite, together with its egg-pouches is 2.125 

 mm. ; without the latter, 1.25 mm." (Leidy, 1. c.) 



Family CYCLOPID.^. 



Body elongated. Cephalothorax ovate and usually sharply 

 separated from abdomen, which much more slender. Anterior 

 antennae of moderate length, scarcely ever longer than cephalo- 

 thorax, and those of male alike on both sides and adapted for 

 clasping. Posterior antennae four-jointed and destitute of sec- 

 ondary branch. Palps of mandibles and maxillae well developed. 

 or sometimes rudimentary. Foot-jaws nearly similar to those of 

 Calanidcc, but usually less strongly developed. First four pairs 

 of feet alike or nearly so, two-branched and adapted for swim- 

 ming, never in any case for prehension. Fifth pair rudimentary, 

 alike in both sexes. Heart wanting. Eye consisting of two 

 coalescent lenses. Two ovisacs in female. 



A large and homogeneous group of copepods, including mostly 

 marine genera. The fresh-water forms are perhaps the most 

 familiar, and among the most abundant of all micro-crustacea. 

 The great similarity, changes with age, conditions, etc., render 

 these creatures among the most difficult among the Crustacea in 

 which to distinguish species. 



Genus CYCLOPS Muller. 



Cyclops Miiller, Zool. Dan. Prodrom., 1776, p. 200. Tj'pe Monoculus quad- 



ricornis Linnaeus, eighth and last species. 

 Macrocyclops Claus, Anz. Ak. Wiss. Wien, Nr. IX, 1893, p. 82. Type 



Monoculus quadricornis var. fuscus Jurine, first species. 

 Microcyclops Claus, 1. c. Type Cyclops diaphanus G. O. Sars, first species. 

 Eucyclops Claus, 1. c. Type Cyclops sermlatus Fischer, first species. 

 Paracyclops Claus, 1. c, p. 83. Type Cyclops affinis G. O. Sars, first species. 

 Homocyclops E. B. Forbes, Bull. €11. State Lab. N. Hist., V, 1897, p. 49- Type 



Cyclops ater Herrick, monotypic. 

 Orthocyclops E. B. Forbes, 1. c. p. 51. Type Cyclops modestus Herrick. 



monotypic. 



Body expanded in front, attenuated behind, in male composed 

 of ten and in female of nine segments. Head anchylosed with 



