Boone, Crustacea, Cruises of "Eagle" and " Ara," 1921-28 157 



The external maxillipeds are stout, leg-like, the distal article long, 

 cylindrical, very setose at the distal end and somewhat flattened and 

 bearing nine unequal black spines on the margin. 



The first legs are chelate, shorter than the maxillipeds; the menis 

 cylindrical, elongated ; the carpus similar but only two-fifths as long ; 

 the propodus about as long as the merus, cylindrical and somewhat 

 swollen ; the fingers subequal ; the lower with a curved black tip which 

 fits between the similar bifid tip of the upper finger. 



The second legs are very slender, nearly one-third longer than the 

 first pair, with the multiarticulate carpus consisting of seven joints; 

 the propodus weak, about as long as the distal carpal joint and the 

 fingers comprising only two-fifths of its length, set in tufts of fine 

 setae. 



The third, fourth and fifth pairs of legs are similar and subequal, 

 each has the merus very slender, elongated, armed on the lower outer 

 lateral margin with a row of nine or ten acute, articulated spines ; the 

 carpus is slender, three-fifths as long as the merus, with a short round 

 process projecting from the upper distal margin; the propodus is as 

 long or a trifle longer than the merus, compressed, cylindrical, armed 

 on the lower margin with a series of spine-like setae; the dactyl is 

 short, being only one-fifth as long as the propodus, with the tip a 

 sharp, curved, brown spine and with a similar subdistal spine causing 

 the dactyl to appear bifid; also four articulated spines along the in- 

 ferior lateral margin. 



Synonttmy. — Hetairus tenuis Spence Bate, Voy. "Challenger" Rept. 

 Macrura, vol. 21, pt. I, p. 613, pt. 2, pi. 99, fig. 3, 1886.— Whit- 

 eaves, Catal. Marine Invert. Eastern Canada, pub. by Geol. Sur- 

 vey of Canada, 1901, p. 252. 



Spirontocaris groenlandica (Fabricius). 



Plate 56. 



Name : The name was adopted from the type locality. 



Type : The type is from the * * seas of Greenland. ' ' 



Distribution : This species is abundant in the laminarian zone of 

 the western Atlantic from Salem, Mass., northward to Hudson Strait, 

 Greenland and Grinnell Land. 



Material examined : Five specimens (four of which are ovigerous) 

 dredged in seven fathoms, mud bottom, upper end of ^Vhitehaven 

 Harbor, Nova Scotia, September 1, 1926. 



