DECAPODS 55 



third segment but little shorter than second ; outer basal scale a narrow 

 lobe; outer flagellum one third longer than the body; inner flagellum 

 one half as long as the outer. Antennal scale a little shorter than the 

 carapace, tapering distally; extremity of blade obliquely rounded and 

 exceeding the spine ; peduncle reaching end of second segment of anten- 

 nular peduncle ; flagellum one and a half times length of body. 



The outer maxillipeds reach to the distal fifth or sixth of the antennal 

 scale. The first pair of feet overlap the proximal third of the terminal 

 joint of the maxilliped. Second pair subequal, overreaching the acicle a 

 little ; carpus composed of from 26 to 33 segments. Third to fifth pairs 

 of feet nearly equal, the third reaching beyond the acicle by length of 

 dactylus and one half or more of propodus, their propodi increasing in 

 length from the third to the fifth pair, while the dactyli increase in reverse 

 order ; so that while the dactylus of the third pair may be contained three 

 and a half or four times in the corresponding propodus, the dactylus of 

 the fifth pair is contained seven or eight times in its propodus ; the spines 

 of the meral and carpal segments are replaced by bristles on the propodi ; 

 dactyli subentire, although there may be a few small very appressed 

 spinules at the base of the concave surface. 



Abdomen two and four fifths to three times as long as the carapace 

 (exclusive of rostrum) ; third segment slightly compressed, its posterior 

 margin produced in a short subacute lobe. Sixth segment nearly three 

 times as long as wide and three fourths as long as seventh ; seventh with 

 five to seven spinules on each side. 



Outer branch of tail-fan about as long as the telson; inner branch 

 much shorter. 



Dimensions. — Length of female i8i mm., length of carapace and 

 rostrum 100.5 wii^ti-* length of rostrum 73.5 mm. Length of female (sta- 

 tion 3675) 21 1.5 mm. 



Distinctive characters. — The spines distributed along the whole upper 

 margin of the rostrum, the unequal dactyli of the third to fifth pairs of 

 feet, and the inequality of the branches of the swimming-fan easily dis- 

 tinguish this species from the preceding. 



Distribution. — From Bering Sea to Washington, 53 to 351 fathoms, 

 at the following stations of the Albatross : 

 Bering Sea, west of Pribilof Islands, 184 fathoms, station 3489. 

 Chernofski Harbor, Unalaska, 109 fathoms, station 3324 (type locality). 

 North of Unalaska, 351, 350 fathoms, stations 3330, 3331. 

 Between Unga and Nagai Islands, Shumagins, no fathoms, station 2848. 

 Off the Trinity Islands, 159 fathoms, station 2853. 

 Clarence Strait, Alaska, 322 fathoms, station 3077. 

 Queen Charlotte Sound, British Columbia, 238 fathoms, station 2862. 



