ii 4 



Description. — The description given by Sars is very elaborate, but some particulars 

 may be added, especially as to the copulatory organs and the antennular flagella, the latter 

 being mutilated in the specimens examined by Sars. 



In the female (fig. i e) the frontal plate is somewhat short and badly defined from the 

 rostrum, which is very long, very oblong-triangular, twice or slightly more than twice as long 

 as broad. In the male (fig. i a) the frontal plate is a little shorter, the rostrum as much longer 

 and besides a little or considerably narrower, than in the other sex. The proximal joint of the 

 antennular peduncles is similar in both sexes; the two distal peduncular joints in the female 

 (fig. i e) are very slender, together more than half as long again as the proximal joint, while 

 in the male (figs. i a and i è) the two distal joints are very thick, short, each only a little 

 longer than broad and together scarcely as long as the proximal joint. In the male the anten- 

 nular flagella are 6-jointed, the lower somewhat longer than the upper and a little shorter than 

 the peduncle; in the lower flagellum (fig. i <•/) the first joint is conical, very thick at the base 

 and thin at the end, nearly two-thirds as long as the sum of the remaining joints; the second 

 joint is small, and the four distal joints subequal in length, strongly compressed, forming together 

 a very oblong, vertical, leaf-shaped plate with the upper margin serrated and convex, the lower 

 glabrous and nearly straight; in the upper flagellum (fig. i c) the first joint is somewhat conical, 

 but considerably shorter and much more slender than in the lower, while the four distal joints 

 are much flattened, forming a horizontal plate completely similar to the vertical plate of the 

 lower flagellum, and this plate has the inner margin serrated and convex, the outer glabrous 

 and nearly straight. In the female both flagella have the same number of joints and relative 

 length as in the male, but they are much more slender and besides proportionately shorter, 

 the lower flagellum being shorter than the sum of the two distal peduncular joints; the major 

 part of the upper flagellum is flattened, of the lower flagellum compressed, but in both flagella 

 very much narrower than in the male. 



The copulatory organs (figs. if — i //), showing the main features of the genus, possess 

 yet some peculiarities. The spine-shaped process (/'.) is short, bent strongly inwards before the 

 middle. The terminal process is short, flat, very broad (fl~.), about two and a half times as long 

 as broad, with the transverse end crenulated and as broad as at the base, the outer maroqn 

 margin straight, the inner margin distally convex, proximally concave. The proximal process (/>°.) 

 is flat, distinctly longer than the terminal and at, or beyond, the middle almost twice as broad, 

 being very much expanded on the inner side with the inner margin forming a rounded an^le 

 of 80 — 100°; a comparison between figs. ig and 1 // shows some not inconsiderable individual 

 variation as to the shape and breadth of this process. The lateral process (ƒ>'.) projects from 

 the base of the median lobe close at the proximal process; it is somewhat shorter than the 

 latter, very slender, with the end acute and directed somewhat outwards (towards the lobe) 

 and with a less or more pronounced tooth a little behind the end on the outer marffin. The 

 auxiliary lobe has nearly disappeared, but about three hooks are found on or before a minute, 

 protruding part of the margin. 



Remarks. This small species is easily separated from other forms by the structure of 

 the elongated pair of legs, which have a high tubercle armed with a spine at the end of the 



