REPORT ON THE CRUSTACEA MACRURA. 729 



The psalistoma is broad and serrate with eight teeth, of which the apical is the largest, 

 the fifth next pronounced and the eighth short and broad ; a small gap separates the 

 series from the molar process, which is cylindrical and covered with many finely serrate 

 points. 



The first pair of gnathopoda is six-jointed ; the coxa is furnished with a short disc- 

 like mastigobranchia that supports a small podobranchia ; the basis is broad and flat, 

 and from its outer margin springs a long and slender ecphysis ; the ischium and meros 

 are continuous with the basis, but the carpos is broad and reflexed against the meros 

 and continuous with the propodos, which terminates ovately and is furnished on its 

 inside margin with long curved spines and strong hairs. 



The second pair of gnathopoda is long, pediform and six -jointed ; the coxa supports 

 a slender rudimentary mastigobranchia and the basis a short and slender ecphysis ; the 

 ischium and meros are probably fused into one, they are flattened and inversely arcuate ; 

 the carpos is cylindrical, long, and continuous with the propodos, which is longer than 

 the dactylos, which is short and tipped with short fringed spines ; the last three joints 

 are thickly studded with hairs that increase in number and strength towards the distal 

 extremity, where they become fringed with minute hairs or tooth-like processes. 



The first pair of pereiopoda is a little longer than the second gnathopod ; the coxa 

 carries a small rudimentary mastigobranchia and the basis a slender ecphysis ; the 

 ischium and meros are continuous ; the carpos is moderately long and stouter than the 

 meros, especially towards the distal extremity ; the propodos is longer than the carpos but 

 scarcely stouter, and terminates in a stout pollex and dactylos that form a chela that is 

 about half the length of the palm. The second pair of pereiopoda is longer and more 

 slender than the first ; it carries a similar rudimentary mastigobranchia and slender 

 basecphysis ; the carpos is as long as the propodos, which terminates in a small chela. 

 The third and fourth pairs of pereiopoda are longer than the second, quite as slender, 

 and have the posterior margin of the meros and carpos fringed with distantly placed, 

 slender, but strong, tooth-like spines ; the dactylos is broken off both. The fifth pair 

 resembles the preceding two excepting that the propodos increases in diameter distally 

 and terminates in a short, robust, serrate dactylos (fig. 4o) enclosed within a bush 

 of long hairs which are attached to the distal extremity of the propodos, the 

 anterior margin of which for half its length is fringed with short curved serrate 

 spines. 



The first pair of pleopoda is long and slender ; the anterior or outer ramus is long 

 and tapering, and the inner is reduced to a foliaceous oval plate furnished on the outer side 

 with a long stylamblys tipped with cincinnuli. The succeeding pans of pleopoda are 

 subecmally biramose ; the posterior, which forms the outer plates of the rhipidura, is 

 lonoer than the telson and has the outer distal angle of the outer branch armed with a 

 small tooth, the inner margiu being fringed with hairs. 



(ZOOL. CHALL. EXP. PAET LII. 1887.) Fff 92 



