Boone, Crustacea, Cruises of "Eagle" and "Ara," 1921-28 199 



tide short, but twice as long as the inconspicuous second article ; the 

 third article about twice as long as the first; the fourth article a 

 trifle longer than the third article ; the fifth article about one and 

 one-half times as long as the fourth; the flagellum is composed of 

 twelve articles. The frontal lamina is inconspicuous, ventrally placed, 

 triangular. The maxilliped has a palp of two articles. 



Thorax : The first article is not quite as long as the head ; the sec- 

 ond and third segments, which are subequal, are each slightly shorter 

 than the first segment; the fourth segment is about as long as the 

 first; the fifth and sixth segments are subequal, each slightly longer 

 than the fourth ; the seventh segment is not quite as long as the sixth. 

 Epimera are distinct on all seven segments; they are narrow plates 

 with the posterior angles increasingly acute, that of the seventh seg- 

 ment projecting beyond its segment. 



Abdomen : The first segment is short, partially concealed, with its 

 postlateral angle acute; the second, third and fourth segments are 

 longer; approximately subequal; the fifth segment is shorter and 

 with the lateral parts concealed ; the sixth or telsonic segment is about 

 as long as the other five considered together and has its posterior 

 margin evenly convex. There is a design etched in black on the base 

 of the telson, composed of three radiating longitudinal lines, arising 

 from the center of a wide arc, the two ends of which are directed pos- 

 teriorly. There are also many small black flecks on the epimera. The 

 uropoda have the peduncle produced into an oblique, long, tapering, 

 acuminate process which lies next to the telson but is not quite so 

 long; the inner blade is the larger, narrowed proximally, widening 

 distally, the terminal margin broadly rounded; the blade is the 

 smaller, not so long as the inner, with its lateral margins approxi- 

 mately parallel for the greater part of their length ; the distal margin 

 rounded. 



Legs : The first three pairs of legs are very prehensile, each armed 

 on the merus with two spines : on the carpus and propodus each with 

 one spine ; the dactyl is very hooked. 



The fourth to seventh pairs of legs, inclusive, are ambulatory, long, 

 set with a series of spines and with a small, sharp, moderately curved 

 dactyl. 



Synonymy. — Rocinela aries Schiodte and Meinert, Naturhistorisk 

 Tidsskrift (3), XXI, p. 828, 1899; Ann. and Mag. Nat. Hist. (7), 

 IV, p. 170, 1899.— Richardson, BuU. 54, U. S. Nat. Mus., p. 210, 

 figs. 213-215, 1905. 



