218 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



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

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



The first segment of the thorax is the longest, and is 1 nim. in 

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

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



FIG. 220. -EGATHOA OCTTLATA. a, MANDIBLE, x 51}. b, MAXILLIPED. x 51}. c, SECOND MAXILLA. 



rf, FIRST MAXILLA, x 51}. 



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 abdomen is 

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

 terminal segment is long and rounded posteriorly. The uropoda are 

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

 narrower than the inner branch and is posteriorly 

 rounded. The inner branch 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, 

 narrow, curved dactyli. The propodus is furnished 

 with five spines, the carpus with two in all the 

 legs. 



JEGATHOA MEDIALIS Richardson. 



jEgathoamedialis RICHARDSON, American Naturalist, XXXIV, 

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



Locality. Barren Island, Chesapeake Bay. 

 Depth. 3 to 25 fathoms. 

 Body narrow, elongate; abdomen not narrower than thorax. 

 Head with anterior margin broadly 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 antennas eight-jointed; second pair more slender, 

 equal in length, and nine-jointed. 



First three segments of thorax subequal, last four subequal and some- 



FIG. 221. 



MEDIALIS. 



