7^ 



some seta-like spines. The second and third joints of the 

 paip have numerous spines. 



The first maxillae have on the apex of the outer plate eleven or 

 twelve spines, unequal but all slender, and on that of the inner 

 plate four plumose setae. 



The second maxillse have several plumose setae on the inner- 

 most plate, all three plates having- the usual spine-armature, and 

 the outermost being articulated considerably above the middle 

 one. Near the base of the appendage below the channelled outer 

 margin! is a very pronu'nent lobe, fringed with upward cur\^ing' 

 setules. Such a lobe is often indicated rather than developed in 

 other genera. In the case of Kxosphaeronia aviplifrons the 

 suggestion has already been offered that it represents an 

 exopod. 



The maxillipeds arc as in Exosphacroma. The plate of the 

 second joint is broad, the processes of the fourth, fifth, and sixth 

 are narrow, and the seventh joint is slender- 



The first gnathopods have the fourth joint as long as the third 

 and broader, its inner margin carrying four denticulate spines^ of 

 which the small triangular fifth joint has six, and the rather long 

 sixth joint has ten, besides two dozen smaller spines planted 

 well within the margin on the inner surface. Between the 

 margin of the finger and its adjacent spine there is a spinule, 

 as in Exosp'liaeroiiia and elsewhere, but here these three parts 

 lie in close proximity. 



The second gnathopods have the third joiniti quite as long as 

 the second, and nuich longer than the fourth, which is even 

 shorter than the fifth. The latter has tw^o or three spines on the 

 inner margin, and within it a close-set row of eight or nine stout 

 spines. The sixth joint is rather large, the upper part fringed 

 with seven stout spines. The unguis is arranged as in the rest of 

 the limbs. 



The first perccopod has the second, third, and sixth joints sub- 

 equal, the sixth a little longer, and the fifth a little shorter thain 

 the second or third, the fourth being the shortest of all. The 

 third^ fourth, and fifth are fringed on the inner margin with 

 brushes of setae- The rather elongate finger is furry on its outer 

 margin. The fifth peraeopod is more slender than the first, and 

 has its second joint longest, the third, fourth, and fifth subequal, 

 the sixth not greatly shorter than the second, the finger furry as 

 in the first pair, but a little shorter. 



The pleopods. The spines on the inner margin of the peduncle 

 of the first three pairs are three in number. The male appendage 

 of the second pair is more elongate than the rami, not acute a(t 

 the apex- The third and fourth pairs have the outer branch two- 

 jointed. The fourth and fifth pairs have both branches 

 branchial, but not pleated, and in the fifth pair the 

 squamiferous processes are scarcely in relief. 



The iiropods have the inner unarticulated branch adjacent to 



