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



hairs ; the coxa is short, smooth, and carries a short and sharp-pointed rudiment of a 

 mastigobranchial plate ; the basis is short, furnished on the inner side with three 

 fasciculi of ciliated hairs, and supports a long, slender ecphysis ; the third joint, which 

 probably is the ischium and meros combined, is long and slender and fringed with simple 

 hairs on the inner side only, excepting for a short distance on the outer side at the base, 

 and bears at the distal extremity a single plumose hair ; the third joint, which probably 

 represents the carpos, is curved at the base to enable it to be flexed against the inner 

 margin of the preceding joints, it is fringed both on the inner and outer side with a 

 series of fasciculi of simple hairs; the fourth or terminal joint, representing the propodos, 

 is long, cylindrical, and tapering at the point, and is fringed on both the inner and 

 outer margins with a series of long hairs, having a fasciculus of short ones at the base 

 of each. 



The first pair of pereiopoda (fig. Ik) is six-jointed and chelate ; the coxa is short and 

 stout ; the basis is short and furnished with long simple hairs on the inner margin, and 

 a rudimentary ecphysis of membranous character on the outer ; the ischium is long, 

 cylindrical, and fringed with long and simple hairs on the inner margin ; the meros is a 

 little lonsjer than the ischium, and frinsfed on both the inner and outer margins with a 

 series of long and short hairs, distally placed in fasciculi ; the carpos is long and narrow, 

 narrower on the inner side near the base to enable it to be flexed more perfectly 

 against the preceding joints, and fringed on both inner and outer margins with long, 

 simple hairs ; the terminal joint or propodos is not more than half the length of the 

 carpos, fringed on both sides with slender bundles of simple hairs, and terminates in a 

 sharp unguiculate point. The second pair of pereiopoda is slender, chelate, and has the 

 carpos biarticulate. There is but one of the appendages of this pair preserved, so that I 

 cannot say if it be unequal or not. The propodos is long, and the pollex and dactylos 

 short. The three following pairs of pereiopoda are slender, having the meros and ischium 

 posteriorly fringed with short teeth, and terminate in a fringed propodos, and a long 

 and styliform dactylos. Each of the pereiopoda excepting the posterior pair is furnished 

 with a rudimentary mastigobranchia. 



The pleopoda are short and biramose ; those of the sixth pair are subequal with the 

 telson in length, and are fringed with hairs. 



The branchiae (fig. 2) consist of a series of five small arthrobranchiae and six large 

 pleurobranchise, but no podobranchiae and only rudimentary mastigobranchiae, as shown 

 in the accompanying table : — 



Pleurobranchise, .... 



Arthrobranchiae, .... 



Podobranchiae, ..... 

 Mastigobranchiae, .... 



