COPEPODS OF THE WOODS HOLE REGION 



361 



(Thompson and Scott) ; Gulf of Guinea (T. Scott) ; California coast 

 (Esterly). 



Color. — Body rather opaque, with pigment spots of red and yel- 

 low irregularly distributed ; they are especially numerous around the 

 mouth, in the lappets of the third and fourth segments, and in the 

 genital segment; eye red; corneal lenses red at the center and 

 bluish around the margin ; eggs bluish green. 



Female. — Head more or less distinctly separated from the first 

 segment; third and fourth segments sometimes fused, sometimes 

 separated ; metasome nearly twice the length 

 of the urosome and caudal rami combined. 

 Lappets of third segment scarcely reaching 

 the center of the genital segment; those of 

 the fourth segment relatively long. Genital 

 segment barrel-shaped; caudal rami as long 

 as the abdomen, five times as long as wide. 

 Total length, 0.8-1 mm. 



Male. — Head separated from first segment ; 

 third and fourth segments fused; lappets of 

 the third segment reaching the center of the 

 genital segment, those of the fourth segment 

 shorter than in the female. Genital segment 

 three-fourths as long as the abdomen and 

 caudal rami combined. Front of head flat- 

 tened so that the corneal lenses point forward rather than upward. 

 Total length, 0.7-0.8 mm. 



Remarks. — ^Wlien alive this species can be recognized by the con- 

 trasting red and blue colors in the corneal lenses ; the distinguishing 

 characters of preserved specimens are given in the key; in the 

 female also the proportional lengths of the genital segment, abdomen, 

 and caudal rami are 3:2:2. 



FiGUKK 2 19. — Corycaeus 

 renustus: a. Female, dor- 

 sal (after Giesbrecht) ; 6, 

 male, dorsal 



Genus CORYCELLA Farran, 1911 



Head fused with first segment, with a pair of corneal lenses on 

 the forehead as in the preceding genus; third and fourth segments 

 fused, the fourth segment without separate epimeral plates; genital 

 segment and abdomen fused. Ventral process between the max- 

 illipeds and first legs beak-shaped, the beak pointing backward. 

 First antennae 6-segmented; second antennae 4-segmented, prehen- 

 sile, the inner margin of the second segment not toothed. Rami of 

 first four pairs of legs 3-segmented, except the fourth endopod, which 

 is lacking; the four exopods with 0, 0, 0, 1 outer spines; fifth legs 

 entirely obsolete. A single species. (See Appendix B, p. 594.) 



