(536 ON CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



than first or third, not strongly armed, third joint with an even row of short spines 

 and one or two long ones at the apex. Anterior articular condyle not very prominent. 



First maxillae. Inner plate with three apical setae or spines and a slender sub- 

 apical one ; outer plate with nine strong spines distinguished. 



Second maxillae. Inner plate (lacinia of second joint) apically fringed with about 

 eight spinules and two long feathered setae ; outer plates (lacinia of third joint divided 

 into two branches, according to Hansen) are very short, each surmounted with a 

 couple of setae : of these plates, so far as I can discern, only the inner is here 

 articulated. 



Maxillipeds. First joint forming a small setose projection in front of the second, 

 its epipod forming a broad projection behind it, this also carrying four small setae ; 

 second joint a little longer than broad, its plate carr3ring one or two hooked spines 

 on the inner margin, a simple spine on the surface and plumose setae at the apex ; 

 thu'd joint broader than long, as also arc the three following joints, of which the 

 first is cup-shaped, the second the largest, and all have marginal setae; the seventh 

 joint is narrowly oval, with setae on the hind margin and apex. 



First gnathopods. These, when in situ, largely conceal the mouth-organs, the third 

 joints meeting just over the peduncular part of the maxillipeds. They are much 

 more massive than any of the following limbs, which on the ventral surface of the 

 animal are wide apart. Second joint substantial, more than twice as long as broad, 

 third about half as long, fourth short but wide, receiving in a sort of cup the 

 somewhat cup-shaped short and wide fifth juint, which on the inner margin forms a 

 blunt tooth or lip, over which the long and strong finger projects, the broad oval 

 sixth joint having its inner margin broken into two tooth-like processes, each like 

 the lip of the fifth joint carrying a minute spine. The arrangement of these last 

 three joints produces a ' complexly subchelate ' gi-asping apparatus, in which the blunt 

 inner apex of the fourth joint may perhaps take a share, for the point of the finger 

 appears to approach it near enough to assist in holding an intervening object. 

 Geaerally in the Cirolanidae the first three pairs of limbs are in near agreement. 



Second gnathopods, with all the joints attached end to end, none of them notably 

 setose or expanded or under-riding or over-riding a succeeding joint. Second joint more 

 than twice as long as thii'd, which is subequal to fourth plus fifth, fourth longer 

 than fifth, with three short stout spines near the base and three near the apex of 

 its inner margin, fifth joint with one such spine at the inner apex, sixth joint longer 

 than fifth or than the little curved bidentate finger. In Girolana horealis (Lilljeborg) 

 the fourth joint over-rides the fifth, in C. sphaeromiformis the fifth under-rides the sixth. 



Fifth peraeopods. These differ little from the second gnathopods, except that the 

 second joint is rather shorter and stouter, the fifth joint longer, the sixth narrower 

 and not longer than the fifth. The fourth and fifth joints have one or two spinules 

 at the apex on each margin, but the fourth joint is without the stout spines ob- 

 servable on the inner margin of the second gnathopod. 



Pleopods. The peduncle of the first pair carries eight uncinate spines, of the second 

 six or seven with two slender spines or setae, of the third five, of the fourth three 

 uncinate spines with two plumose setae, the spines being longer than those of the 



