Vol. XII, pp. 39-40 March 24, 1898 



PROCEEDINGS 



/& 



BIOLOGICAL SOCIETY OF WASHINGTON 



DESCRIPTION OF A NEW PARASITIC ISOPOD OF THE 

 GENUS .EGA FROM THE SOUTHERN COAST OF THE 

 UNITED STATES.* 



BY HARRIET RICHARDSON. 



Two specimens of a species of sEga, heretofore undescribed, 

 were obtained by the U. S. Fish Commission steamer 'Albatross' 

 during its cruises in 1885 and 1886 — one off Little Bahama Bank 

 and the other between the delta of the Missis- 

 sippi and Cedar Keys, Florida. They present 

 no unusual characters, but differ from any of 

 the known species of JEga. 



-33ga ecarinata gp. nov. 



Body elongate and narrow. Length more than 

 three times greater than breadth. Surface punctate. 

 Frontal margin of head Insinuated, the acumen sepa- 

 rating the first pair of antenna?. Eyes large and ob- 

 long and situated at a small distance apart. First pair 

 of antennae extending almost to the flagellum of the 

 second pair of antennae ; the first two joints of pedun- 

 cle very broad ; second joint extending anteriorly over 

 the third joint, reaching almost to the extremity of 

 that joint ; third joint two-thirds narrower than first 

 and second ; the flagellum containing nine articles. 

 Second pair of antennas extending to the middle of 

 the first thoracic segment; flagellum containing ten 

 articles. 



Fig. l.—JEga ecarinata 



(X 2 5). 



-7 



Epimera of all the thoracic segments narrow, the 

 first two being rounded, the other four more acute at 

 their extremities. First two pairs of prehensile legs rather stout; third 



* Published by permission of the Secretary of the Smithsonian Insti- 

 tution. 



9— Biol. Soc. Wash., Vol. XII, 1898. (39) 



