390 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.39. 



(albidus, whitish, in alhision to the general color.) 

 Only a single lot of this species, consisting of two females, was 

 obtained from the vent of a shovel-headed shark, Sphyrna tiburo, at 

 Beaufort, N. C, in the summer of 1905. These are numbered 38587, 

 U.S.N.M., and are made the types of the new species. They are 

 readily distinguished from carcharix by the fact that the free seg- 

 ments diminish regularly in size, leaving the fourth segment but little 

 wider than the fifth. On closer examination all the appendages 

 show specific differences, notably the first maxillae, mandibles, and 

 second maxillipeds, 



IRODES, new genus. 



Female. — Cephalothorax much larger than any of the free seg- 

 ments, which diminish regularly in size from in front backwards. 



Genital segment but little enlarged; abdomen cylmdrical, and 

 four-jointed in the two species known; anal laminos small and armed 

 with very short bristles. Egg-tubes also short and club shaped. 

 First antennae cylindrical, the basal joint but little enlarged and 

 armed with short setae, not flattened, and without tactile hairs or 

 chitin processes. Second pair similar to those of Bomolochus. 

 Mandibles three-jointed, the terminal joint bipartite and toothed; 

 maxillary hooks like those of Tseniacantlius; first maxillae probably 

 of the usual pattern. Second maxillae simple and three-jointed; 

 maxillipeds behmd these and only a trifle larger. They are also like 

 the second maxillae in structure and arrangement, except that they 

 are tipped with two or three plumose setee instead of one smooth 

 spine. Each ramus of the first legs with a single widened joint; other 

 legs as in BomolocJius. 



Type-species. — Irodes (Bomolochus) gracilis Heller. 



(Irodes, Irus, the well-known beggar of Ithaca, and eldoc, simi- 

 larity or likeness.) 



Here belong the type species just mentioned and Bassett-Smith's 

 "BomolocJius tetrodontis." The description of these two forms is 

 complete, except that neither author discovered the first maxillae. 

 There is no reason to believe, however, that they differ from the type 

 found in the other genera of the Ergasilidae. If it should turn out 

 that the authors are right and that these maxillae are really lacking 

 that would be a still stronger reason for creatmg the above new genus. 



PHAGUS, ne^A^ genus. 



Female. — Cephalothorax much larger than any of the free seg- 

 ments, which diminish regularly in size. Genital segment consider- 

 ably enlarged, nearly twice the diameter of the abdomen; the latter 

 cylindrical and tapering; anal laminae short, each armed with three 

 setae, of which the inner one is more than half the entire length. 



