NO. 1573. PARASITIC COPEPODS— WILSON. 483 



The first antennae are longer than in the female and more densely 

 armed with setae; the second antennae are much enlarged and the 

 terminal claw projects well in front of the carapace. 



The other appendages are similar to those of the female except 

 that in all of them the spines and claws are longer and sharper. 



The basal joint of the exopod of the first legs is somewhat swollen 

 and armed along its outer margin and the adjacent ventral surface 

 wdth stout curved spines pointing backward. The claw at the outer 

 corner of tliis joint and those on the tenninal joint are enlarged 

 and furnished along their margins wdth a row of stout teeth. Of the 

 reproductive organs the testes are of good size and (|uite prominent; 

 the spermatophore receptacles in the genital segment are very large, 

 filling almost the entire segment. The posterior part where the 

 ripe spermatophores are lodged is club-shaped and fills nearly the 

 whole half diameter of the segment. It is narrowed anteriorly wdiere 

 the duct from the testis enters it, but is not coiled as much as in 

 most genera. 



Total length, 5 mm.; length of carapace on mid line, 2 mm.; width 

 of same, 4 mm.; length of genital segment, 1.58 mm.; width of 

 same, 1.4 mm. 



Color the same as in the female. 



(serratus, toothed like a saw^, alluding to the margins of all the 

 body regions.) 



The males and females of tins species are found together and in 

 company with those of Cecrops and Orthagoriscicola on the Sunfish. 

 The collection of the U. S. National Museum includes five lots, all 

 obtained from the Sunfish, Mala Tnola; Cat. No. 941, U.S.N.M., taken in 

 Casco Bay in 1873; Cat. No. 32779,U.S.N.M., taken by the Fisheries 

 steamer Alhatross in September, 1886; Cat. Nos. 32778 and 32780, 

 U.S.N.M., obtained by the schooner Grampus about 120 miles off 

 Woods Hole; Cat. No. 32781, U.S.N.M., from a Sunfish taken at 

 the surface in Vineyard Sound. 



