72 PEOCEEDINGS OF THE NATIONAL MUSEUM. vol.60 



Remafhs. — Nordmann described and figured the type species in 

 considerable detail and then added on page 134 of the same paper 

 two other species, but gave no figures for these and briefly described 

 one of them only. These two species were found upon different hosts 

 in the Red Sea, L. lichiae upon Lichia aculeata and L. hemiprichii 

 upon Hydrocycnus dentex. Neither of them have been seen by any 

 investigator except Nordmann, and it is impossible on the basis of 

 the data he gives to distinguish them from the type species or from 

 each other. 



Genus DONUSA Nordmann. 



Donusa Noedmann, Bull. Soc. Imp. Nat. Moscou. vol. 37, 1864, p. 494. 



Generic characters of female. — Head fused with first thorax seg- 

 ment to form a triangular cephalothorax, pointed anteriorly ; second, 

 third, fourth, and fifth segments free, each with a pair of biramose 

 swimming legs. Genital segment very small, enlarged posteriorly. 

 Abdomen three-jointed, tapered posteriorly; anal laminae slender, 

 elongate, jointed near their tips, armed with nonplumose setae. 



First antennae filiform with enlarged basal joints; second pair also 

 filiform and setose, not uncinate. Second maxillae and maxillipeds 

 large, strong, and tipped with stout claws. Five pairs of biramose 

 legs, rami three- jointed. Male unknown. 



Type of the genus. — Donusa clymenicola Nordmann, monotypic. 



Remarks. — This genus was founded upon two female specimens 

 taken on the west coast of Sweden from the Annelid, Clymene Ivmi- 

 hricalis Fabricus. No one except Normann has ever seen specimens 

 of the genus and no other investigator has even mentioned them ex- 

 cept Levinsen, who published a list of parasitic copepods found upon 

 Annelids and merely mentioned Donusa in the list. The genus seems 

 to be well established, however, and both Nordmann's description 

 and figures are clear-cut and decisive. 



The fact that the fifth legs are biramose, with three- jointed 

 rami, like the four preceding pairs, is the most distinctive character 

 of the genus. 



BASSETTITHIA, new genus name. 



Bassettia Stebbing, Willey's Zoological Results, pt. 5, 1900, p. 672. 



External generic characters of female. — Head fused with first 

 thorax segment, the resulting cephalothorax globose, with strongly 

 convex margins. Second, third, and fourth segments indistinctly 

 separated; fifth and genital segments fused, oblong oval in outline, 

 longer and wider than the rest of the body, with projecting posterior 

 corners. Abdomen one- jointed; anal laminse narrow and tipped 

 with minute setae. 



First antennae nine-jointed; second pair prehensile with a stout 

 terminal claw. First three pairs of swimming legs reduced to mere 



