60 



BULLETIlSr 15 8, UNITED STATES NATIONAL MUSEUM 



asymmetrical, with protuberances on each side and the ventral sur- 

 face ; caudal rami twice as wide as long, with a dense fringe of hairs 

 on their inner margins ; exopod of first leg 3-segmented ; basipod of 

 fourth leg with a process on the inner margin armed with stout 

 spines. Total length, 6.9 mm. 



Male. — Forehead without a crest; urosome only one-fourth as long 

 as metasome ; anal segment very short ; genital segment symmetrical, 

 without protuberances; first 4 pairs of legs, like those of female; 

 fifth legs biramose, endopods 1-segmented, exopods 3-segmented, the 

 right one tipped with a very long and slender spine, the left one with 

 a minute spine; neither endopod reaches the distal end of the first 

 segment of the exopod. Total length, 6.5 mm. 



FiQUBE 30. — Chirundina pustulifera : a, Male, dorsal; 6, left, and c, right 

 fifth leg of male ; d, female urosome, dorsal (after Giesbrecht) 



Remarks. — With, in the reference cited above, has given valid 

 reasons for referring this species to the genus Chirundina., and the 

 present specimen belongs to that genus rather than to Vndeuchaeta., 

 as is shown by its fifth legs. This is the first record of the species 

 from American shores. 



Genus GAETANUS Giesbrecht, 1888 



Head fused with the first segment and carrying on its dorsal sur- 

 face at the anterior end a median spine; fourth and fifth segments 

 fused, with sharp spines at the posterior corners in the female, 

 smoothly rounded in the male ; urosome 4-segmented ; exopod of first 

 legs 2- or 3-segmented, of the three following pairs 3-segmented ; en- 



