158 



BULLETIN" 15 8, UNITED STATES NATIONAL MUSEUM 



Color. — Body greenish yellow, opaque, with spots of dark green- 

 ish blue on the front and sides of the head, and a row along either 

 side of the thorax in the grooves between the segments ; tips of the 

 first antennae reddish. Blue, violet, brown, yellow, red, and green 

 pigments are scattered in varying proportions and intensities 

 through the body and the appendages. Often these colors are 



sharply differentiated and give 

 the copepod an unusually gaudy 

 appearance. Traces of these col- 

 ors are still visible in the Georges 

 Bank male recorded above, even 

 after 50 years' immersion in 

 alcohol. 



Ferrude. — Metasome a little more 

 than twice as long as wide, much 

 narrowed anteriorly, very little 

 posteriorly; posterior lobes of 

 fifth segment symmetrical, reach- 

 ing beyond the center of the 

 genital segment; urosome 2-seg- 

 mented, asymmetrical, the gen- 

 ital segment twisted to the right; 

 left caudal ramus larger than 

 right ; endopod of fifth legs short, 

 tipped with two pointed processes 

 of equal length; exopod three 

 times as long as endopod, curved 

 and tipped with two unequal 

 spines, with a larger spine on the 

 inner margin and three minute 

 spinules on the outer margin. To- 

 tal length, 4^.5 mm. 



Male. — Head asymmetrical, 

 swollen on the right side; right 

 corner of fifth segment much 

 longer than left, reaching the cen- 

 ter of the caudal rami ; a knoblike 

 process on the right side of the second abdominal segment; genital 

 opening on the left side; caudal rami symmetrical; left fifth leg 

 5-segmented, tipped with two or three unequal spines; thumb of 

 chela on right fifth leg longer than finger, no processes on the hand. 

 Total length, 3.25-3.5 mm. 



Remarks. — This species can be distinguished by the conspicuous 

 asymmetry in both sexes, by the lack of cuticular lenses and lateral 



FiGDRE 107. — Pontellopsis regalis: a, 

 Male, dorsal ; b, male, right first an- 

 tenna ; c, male, fifth legs. (From W. M. 

 Wheeler) 



