REPORT ON THE CRUSTACEA MACRURA. 470 



the distal joint being tipped with five long hairs, and near the base on the anterior 

 margin supports a single-jointed appendage. 



The first pair of pereiopoda (fig. 5k) has the coxa short and robust, the basis is 

 formed as in the preceding pair, and bears a biarticulate ecphysis at the tip, but instead 

 of only one, there are four or five succeeding joints, forming a perfect limb, which gradu- 

 ally increases in thickness to the middle of the propodos, and then gradually tapers to 

 the extremity ; the last joint is obscurely chelate. The second pair of pereiopoda (fig. 5/) 

 resembles the first but is slightly less robust. The third pair (fig. 5m) is more slender 

 than the preceding but formed on the same plan, excepting that it terminates in a simple 

 dactylos, which is long, straight, and tapering. The fourth pair (fig. 5n) is robust and 

 shorter than the preceding, but the basisal joint is short, robust, and without an 

 ecphysis or the prominent process on which it stands in the previous appendages. The 

 fifth pair (fig. 5o) is like the fourth but the articulations are not so distinctly marked, 

 except those of the coxa and carpos, and the terminal joints are more slender. 



The pleopoda are biramose, the branches being short and supported on a long- 

 peduncle ; the sixth pair is shorter than the telson, and fringed with hairs on the inner 

 margin. 



Observations. — Three specimens were captured in the same district. That from which 

 the appendages were taken was a more or less injured specimen obtained off Sibago. 

 The specimens were approaching the time of shedding the exuvium, and are thus 

 interesting, since the outer dermal tissue represents the form in which the animal was in 

 the previous stage, and the inner that to which it was approaching. 



The third pair of siagnopocla exist in the form of short, double-branched, imperfect 

 legs, of which the first joint is short, the second long, and the three terminal very short 

 and immature, while the branch or ecphysis consists of two laterally compressed joints 

 of subequal length, the distal one being fringed with six hairs. The first pair of 

 gnathopoda is also five-jointed ; the joints at the base, together with the ecphysis, 

 correspond with those of the preceding pair, but the three succeeding are larger ; the 

 first is comparatively short, while the two succeeding joints are each about eight times 

 its length ; the second being genuflexed near its articulation. 



The second pair of gnathopoda differs in plan from that of the first, inasmuch as the 

 continuation of the true leg consists of only a single, short, uniarticulated joint, tipped 

 with two small hairs springing from the base of the second joint and not from its 

 extremity, whereas the ecphysis or secondary branch is biarticulate like those of the 

 preceding pair, but unlike them is attached to the distal extremity, which is projected 

 considerably beyond it. 



The first three pairs of pereiopoda have the basis and its ecphysis formed on the same 

 plan, but the five distal joints are present, enclosed within the exuvium. But the 

 posterior two pairs are not branched. 



