REPORT ON THE CRUSTACEA MACRURA. G55 



The second pair of antennae is slender and rather longer than the animal, and has a 

 scaphocerite with parallel margins, the outer being armed with a strong tooth ; it reaches 

 to half the length of the rostrum. 



The mandibles (fig. Id) have a stout molar process, a strongly toothed psalistbma 

 separated from it, and a three-jointed synaphipod, of which the terminal joint is the 

 broadest. 



The first pair of gnathopoda (fig. Ih) is subpediform and seven-jointed; the propodos 

 is refiexed against the meros and ischium ; the dactylos is broad and short ; the basis 

 carries a long ecphysis, and the coxa supports a short mastigobranchia and a small 

 podobranchial plume. 



The second pair of gnathopoda (fig. li) is long and straight, reaching to the middle 

 of the rostrum, and terminates in three or four short spines ; the coxa has neither 

 mastigobranchia nor podobranchial plume, but there stands on the outer surface near the 

 articulation a strong, stout, calcified plate, the function of which I have not been able 

 to determine ; the second joint or basis carries an ecphysis that is half the length of the 

 next succeeding joint. 



The first pair of pereiopoda (fig. Ik) is long and more slender than the second pair of 

 gnathopda ; the coxa carries a rudimentary basecphysis that terminates in a small hook, 

 and also a fasciculus of long, slender, flexible hairs ; the basis is short and the ischium 

 long and produced to a strong tooth-like point on the anterior distal extremity, and it 

 articulates obliquely with the meros, which is longer, and slightly tapering to the carpal 

 joint ; the latter is longer than the meros, and twice the length of the propodos, which 

 gradually tapers, and terminates in a small, short, styledike dactylos, immersed in a 

 terminal brush of hairs (fig. Ik"). The second pair of pereiopoda is minutely chelate, 

 and unequal, the appendage on the left side being as long as the body of the animal 

 from the orbit to the base of the telson, and having the carpos multiarticulate and as 

 long as the ischium and meros ; that on the right side is a little more robust than the 

 left, about half the entire length of the animal, and has the carpos as long as the 

 preceding two joints. The posterior three pairs of pereiopoda are similar to one another 

 in appearance, increasing slightly in length posteriorly, and also in the spinous character 

 of the ischium and meros ; the dactylos is short, sharp, unguiculate, and fringed with 

 spines on the inner surface. 



The pleopoda are rather stiff, subfoliaceous, narrow and pointed, and furnished on 

 the inner ramus with a small club-shaped stylamblys that diminishes in importance on 

 each appendage posteriorly. 



Observations. — With this species was associated a smaller damaged specimen which I 

 believe belongs to Plesionika spinypes, but the spines on the posterior pairs of pereiopoda 

 are reduced in number and size. 



