186 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 171. ^EGA SYM 

 METRICA. THIRD 

 LEG. x Hi. 



has one long spine at the outer distal angle. The following four pairs 

 of legs are long and slender, furnished with hairs at the distal 

 extremity of the joints and armed with few spines. 



The first five segments of the abdomen are short, the first is shortest, 

 and the fifth the longest in the median dorsal line. The terminal or 

 sixth segment of the abdomen is linguiform and 

 rounded posteriorly with serrulated margin. 



The uropoda extend a little beyond the posterior 

 margin of the terminal abdominal segment; the outer 

 branch is narrow, ovate, and pointed at the distal 

 extremity; the inner branch is almost twice as wide 

 as the outer one; both have serrulated margins. 



Four specimens come from the U. S. Bureau of 

 Fisheries steamer Albatross station 4228, vicinity of 

 Naha Bay, Behm Canal, southeastern Alaska, and one 

 from Albatross station 4199, Queen Charlotte Sound, 

 off Fort Rupert, Vancouver Island, British Columbia, 

 at depths of 41 to 107 fathoms. The type specimen 

 is in the U. S. National Museum (Cat. No. 29247). 

 The following note by Mr. Harold Heath accompanies the Fort Rupert 

 specimen: "Eyes black. Rusty -brown spots on dorsal surface. Ver- 

 milion-colored ovary (?) shows through translucent cuticle." 



Onl3 T two other species of ^Ega are known in the Pacific coast fauna 

 of North America, ^Ega lecontii(D&nsi) a and ^Ega microphthalma Dana. 6 

 The present species differs from ^Ega lecontii, (1) in the greater length 

 of both pairs of antennae; those of the first pair reach to the posterior 

 margin of the first thoracic segment, instead of to the end of the peduncle 

 of the second pair or almost to the posterior margin of the head, and 

 those of the second pair reach to the middle of the third thoracic seg- 

 ment instead of almost to the posterior mar- 

 gin of the first; (2) in having neither the basal 

 joints of the peduncle of the first pair of an- 

 tennae greatly dilated nor the second joints 

 with a process at the apex extending nearly 

 the length of the third joint; (3) in the much 

 shorter body, as compared with the width; 

 (4) in having the terminal segment rounded, 

 not truncate, at the apex; (5) in the longer 

 uropoda; (6) in having the median point of 

 the frontal margin of the head arch over the 

 basal joints of the antennae to meet the frontal lamina on the ventral 

 side, and (7) in the different shape of the frontal lamina. 



The present species differs from A. microphthalma in the longer 

 first pair of antennae, which reach the posterior margin of the first 



FIG. 172. JGA SYMMKTRICA. POS- 

 TERIOR PART OF ABDOMEN. X 6. 



Proc. U. S. Nat, Mus., XXI, 1899, pp. 826-827. 

 &Proc. Acad. Nat. Sci. Phila., VII, 1854, p. 176. 



