218 



BULLETIN 54, ITNTTED STATES NATIONAL MUSEUM. 



arated by a sMiall space. The maxillipeds have a palp composed of 

 two articles. The palp of the mandibles has three articles. 



The first secernent of the thorax is the longest, and is li mm. in 

 length. The second and third segments are each 1 mm. long. The 

 four following segments are each ^ mm. long. The epimera are dis- 



FlG. 220.— .y.GATHOA OCULATA. a. 



Mandible. :•' fiif. h, 

 )I. First maxilla. 



Maxilliped. 

 N 51 ^ 



X 51|. C. SECOM) MAXILLA. 



tinctly separated on all the segments with the exception of the first. 

 They extend the full length of the lateral margins. 



The abdomen is as wide as the thorax, and the abdominal segments 

 are as long as the thoracic segments. The length of the al)domen is 

 5 mm., or nearly half the entire length of the body. The sixth or 

 terminal segment is long and rounded posteriorly . The uropoda ai'e 

 longer than the terminal segment. The outer branch is longer and 

 narrower than the inner ])ranch and is posteriorly 

 rounded. The inner l)ranch is broad posteriorly and 

 is obliquely truncate. The uropoda and the terminal 

 abdominal segment are fringed with hairs. 



All the legs are prehensile and terminate in long, 



1 _i narrow, curved dactyli. The propodus is furnished 



y^'^^^^ES^ with five spines, the carpus with two in all the 

 legs. 



^GATHOA MEDIALIS Richardson. 



jJ^gathoa medialis Richardson, American "Naturalist, XXXIV, 

 1900, p. 220; Proe. U. S. Nat. Mus., XXIII, 1901, p. 527. 



Locality. — Barren Island, Chesapeake Bay. 

 Depth.— 2, to 25 fathoms. 

 Body narrow, elongate: abdomen not narrower than thoi'ax. 

 Head with anterior margin ])roadly rounded in front; central por- 

 tion sharply raised above lateral portion, which is deeply excavate just 

 in front of eyes. Eyes large, occupying two-thirds the width of the 

 head. First pair of antennje eight-jointed; second pair more slender, 

 equal in length, and nine-jointed. 



First three segments of thoi-ax suljecpial, hist four subequal and some- 



Fk;. 221.— .Egathoa 

 medialis. 



