COPEPODS OP THE WOODS HOLE EEGION 379 



Female. — Head fused with first segment, the two two-thirds the 

 body length, the antennal area projecting from the center of the 

 .frontal margin, and separated from the rest of the head by a well- 

 defined groove, Urosome only one-eighth as long as metasome; 

 genital segment oval, narrowed anteriorly; caudal rami as wide as 

 long; apical setae very unequal. Second segment of second an- 

 tenna much wider than the first, with a large lobe on the outer mar- 

 gin and a smaller one on the inner margin, apical claw with a tooth 

 at the center of the inner margin. Ovisacs as long as the body, 

 spindle-shaped. Total length, 0.7 mm. 



Male. — Unknown. 



Remarks. — This species is apparently confined to the mummichogs, 

 and is not at all abundant, a long search for it resulting in a single 

 badly mutilated specimen. 



Family BOMOLOCHIDAE 



Genus TUCCA Kr^yer, 1837 



Body made up of a small cephalothorax joined by a short neck 

 to an inflated thoracic trunk, to which is attached posteriorly a short 

 urosome. Cephalothorax inflated dorsally, deeply hollowed ven- 

 trally, with a lobed wing on each lateral margin. First antennae 

 4-segmented; second antennae 3-segmented, end segment covered 

 with rows of short spines and tipped with curved claws. Mouth 

 parts at the bottom of the ventral depression of the head; rami of 

 first legs widened and 3-segmented, of the second legs 2-segmented; 

 exopods of third and fourth legs 2-segmented, endopods 1-seg- 

 mented ; fifth legs lacking in the female, unirampse and 1-segmented 

 in the male. Ovisacs cylindrical, eggs minute and exceptionally 

 numerous. 



KET TO THE SPECIES (FEMAT.KS) 



1. Posterior margin of thoracic trunlj distinctly 3-lobed, not over- 

 hanging or concealing the urosome impressus (p. 379) 



Posterior margin of thoracic trunk smoothly rounded, but over- 

 hanging and entirely concealing the urosome corpulentus (p. 380) 



TUCCA IMPRESSUS Krfjyer 



Figure 234 



Tucca impressus Ke0ter, Naturh. Tidsskrift, vol. 1, p. 479, pi. 5, fig. 2, 1837. — 

 Wilson, Proc. U. S. Nat. Mus., vol. 39, p. 354, pis. 48-49, 1911. 



Occurrence. — On the pectoral and dorsal fins of the swellfish 

 {Chilomycterus schoepfl), at Woods Hole. 



DistHhution. — Danish West Indies on Diodon hystrix (Kr0yer) ; 

 west coast of Africa on Diodon (Nordmann) ; Beaufort, N. C., on 

 CMlomycteTUs (Wilson). 



