1508 THE VOYAGE OF H.M.S. CHALLENGER. 



" Body produced, strongly compressed laterally, with large triangular head, strongly 

 narrowed in front. Front antennae of the male with tumidly produced peduncle (mit 

 kolbig gestrecktem Schaft) and two-jointed flagellum. Hinder antennae of the male five- 

 jointed, with short middle joint, not laid together in zigzag folding. Both pairs of 

 gnathopods have a monodactyle termination (neither chelate nor subchelate). Third 

 peraeopods very strong and long, with produced laminar first joint. Fourth peraeopods 

 very thin and feeble, with the laminar first joint broad and irregularly extended. Fifth 

 peraeopods rudimentary, reduced to the extensive first joint with wart-like appendage. 

 The peduncles of the uropods elongate, those of the second and third pairs about as long 

 as their fin-like widened rami. Telson quite reduced." 



The two-jointed flagellum of the upper antennae in the above definition refers only 

 to the slender terminal joints, not including the large joint regarded in this Report as 

 the first of the flagellum. 



Pronoe capito, Guerin (PL CLXXXVL). 



The synonymy of the species will be found in the places cited for that of the genus, 

 with the exception of the references to Dana and Gerstaecker. 



Upper Antennas. — Peduncle not very tumid, first joint not longer than broad, second 

 and third joints much shorter ; first joint of the flagellum nearly twice as long as the 

 peduncle, almost straight, but with somewhat sinuous margins, the upper with some fine 

 hairs at intervals, the under with a thick brush of filaments ; the minute second joint 

 attached at the apex of the first, carrying some filaments below the centre of its lower 

 margin ; the third joint linear, longer than the second. 



Lower Antennas. — Opening of the gland-cone in a laminar joint, at some distance 

 from the point at which the third joint of the peduncle is socketed ; the third joint 

 narrow, straight, in the same line with the fourth, which is only half as long ; the fifth 

 joint forming an angle with the fourth, not half as long ; the flagellum bent back at 

 right angles to the fifth joint of the peduncle, the first joint longer than the second, 

 the two together shorter than the third joint of the peduncle ; the last three joints of 

 the peduncle and the two of the flagellum fringed with short filaments, which are closest 

 together on the terminal joint of the flagellum, but infrequent on the fifth joint of the 

 peduncle. 



Mandibles. — The cutting edge straight, striated, and finely denticulate, with a blunt 

 tooth or projection at the upper end and a small sharp upturned tooth at the lower ; the 

 secondary plate of the left mandible similar to the principal, but without projections at 

 the extremities ; the palp with very large first joint, much broader and longer than the 

 two following together ; the second broader and a little longer than the third ; the third 

 curved, blunt-ended, having adpressed hairs on its surface. 



