no.1653. PACIFIC coast COPEPODS— WILSON. 449 



first pair fairly stout and tipped with three long and stout setae, the 

 other legs of the same pattern seen in caudatv.8. 



Total length, 4.65 mm. Length of carapace, t.5 nun.: of tree seg- 

 ments. 0.82 mm.; of genital segment. 1 mm.: <>f egg -ding-. <>.'.) mm.; 

 of abdomen, 1.45 mm. Width of carapace. -2 nun. 



Color. — A dark yellowish or reddish white, thickly marked over 

 the entire dorsal surface with a network of line lines of ;i bright red- 

 brown color. 'Idle latter tint can be plainly seen with the naked eye. 



Male. — Carapace ovate, of about the same length and width, the 

 grooves on the dorsal surface and the eyes being similar to those of 

 the female. 'Third thorax segment considerably shorter than in the 

 female: fourth segment wider than the genital segment, and two- 

 thirds as long, its sides projecting in a sharp angle. Genital seg- 

 ment obovate, its sides indented at a point one-third the distance 

 from the posterior border. It carries two pairs of well defined legs 

 on its ventral surface, one at the posterior corners and the other 

 opposite the lateral indentations (fig. 68). 



Abdomen t wo- jointed, the terminal joint as long again as the basal ; 

 the latter is strongly constricted where it joins the genital segment. 

 Appendages like those of the female except for the usual sexual dif- 

 ferences and a change in the second maxilla 1 . These latter art' con- 

 tracted into narrow, bluntly pointed spines, with no trace of bifurca- 

 tion at their tips. 



Total length. 2,175 nun. Length of carapace, 1 mm.; of genital 

 segment, 0.34 mm.; of abdomen. ().!> nun. Width of carapace, 1 nun. 



Color. — The same as that of the female, but paler and with the 

 pigmented lines very much reduced in number. 



This species has been twice described, first by Rathbun in 1887 and 

 again by the present author in 1 ( .M)7. But both these descriptions 

 were from the same single, poorly preserved female specimen 

 taken from a sting ray in Vineyard Sound. Enough was visible in 

 that specimen to establish its claim as a new specie-, but there were 

 still many details which could not be made out definitely. These 

 missing details have been supplied in the present description and the 

 male is here portrayed for the first time. 



There are several differences between these specimens and the orig- 

 inal type, but they are no more than would naturally be expected 

 in material from Mich widely different sources. They are all of minor 

 importance and are certainly not of enough value to establish even a 

 variety, to say nothing of a new species. The length of the egg- 

 strings in any of the females, taken singly, would suggest that the 

 copepod bearing them was not fully grown. But they are the same 

 in each of the females, and this fad. coupled with the evidence of 

 what can be seen inside the genital segment, make it practically 

 certain that the\ are all adults. 

 Proc. N. M. vol. xxxv— OS 28 



