A NEW GENUS AND THREE NEW SPECIES OF PARASITIC 

 ISOPOD CRUSTACEANS 



By W. p. Hay, 



Of the Washington (District of Columbia) High Schools. 



The three species of bopyridian crustaceans herein described were 

 collected by the author during the summer of 1915 while making a 

 study of the decapod crustaceans of the region about Beaufort, North 

 Carohna, for the United States Bureau of Fisheries. For the facilities 

 for obtainmg, preser\ang, and studying the animals I have to thank 

 the Director of the Beaufort Fisheries Biological Station, Mr. S. F. 

 Hildebrand, and the Commissioner of Fisheries, Dr. Hugh M. Smith. 

 It is with the permission of the latter that the paper is pubhshed. 



PHRYXUS SUBCAUDALIS, new species. 



Plate 98, figs. 1 to 6. 



Holotypes. — Cat. No. 48367, U.S.N.M., paratypes female and male. 

 Cat. No. 48368, U.S.N.M., from Onslow Bay, North Carohna, about 

 20 miles off Beaufort Inlet, on SynaljjJieus longicarjms (Herrick) ; 

 depth, 10 fathoms; station 8293, United States Fisheries Steamer Fish 

 Hawk; August, 1915. 



Female (Holotype). — Similar in general appearance and structure 

 to Phryxus ahdominalis Kr0yer, but differing markedly in having five 

 weU-developed legs on the long side of the body, the second and third 

 legs only being absent. The expanded epimera of the abdominal seg- 

 ments are usually shorter and broader than those of P. ahdominalis 

 and are inclined to be orbicular or even broader than long. The pos- 

 terior lobe of the broad plate borne by the first leg is longest in it 

 transverse diameter. The terminal segment of the abdomen tapers 

 to a point and is not notched at the end. 



Male (Paratype) . — Compared with P. ahdominalis the thoracic and 

 abdominal segments taper more toward their sides, thus giving the 

 body the appearance of being more loosely articulated, the legs appear 



Proceedings U. S. National Museum, Vol. 51— No. 2165. 



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