632 ox CRUSTACEA BROUGHT BY DR WILLEY FROM THE SOUTH SEAS. 



have the fifth joint rather broader than long, with four or five setae on its outer 

 margin. 



First gnathopods. The third joint is tipped with long setae on the outer apex, 

 the fourth has its outer apex narrowl}- produced along the base of the si.xth and 

 tipped with slender spines or spine and spiniform setae, its inner margin canying three 

 stout spines and others of slighter dimensions ; the fifth joint is quite small, under- 

 riding the si.xth, which has a row of four spines along the inner margin : the finger 

 is long, tipped with a short nail. 



The second gnathopods differ from the first in that the fifth joint is rather larger, 

 not under-riding the si.xth, and the outer process of the fourth only reaches the end 

 of the fifth : the sixth joint has three spines along the inner margin. The finger is 

 as long as the fifth joint. 



First peraeopods in close agreement with the second gnathopods. 



The second to the fifth peraeopods agree in general structure, but \vith consider- 

 able differences iii size and other details. The second are much the smallest, and 

 agree with the third in having the second joint narrowly oval, with very fine marginal 

 and apical setae, while in the fourth and fifth pairs this joint is broad, especially at 

 the lower part in the fifth pair, and is fringed with plumose setae all along the hind 

 margin and with very long ones on the front apical margin. In all the pairs the 

 third, fourth, and fifth joints are strongly spined ; these joints are successively longer 

 to the fourth pair, but in the fifth scarcely so long as in the third ; the sixth joint 

 is longest in the third pair and shortest in the fifth. 



The second j^leopods in the male have the stiliform process obtuse at the apex, 

 and not quite so long as the inner ramus. The rami of the fifth pair are very broad ; 

 in the outer the transverse suture is only faintly perceptible. 



Uropods. The peduncle, with a few setae on its inner margin, is produced on the 

 inner side well to the middle of the inner ramus, which is more than twice as broad as 

 the outer, and without being much longer reaches much beyond it, as well as somewhat 

 beyond the telson. On the distal half or two-thirds it is fringed with long plumose setae, 

 intermingled with spines, five on the convex serrate inner margin, and three on the much 

 straighter outer margin, these margins meeting in a subacute apex. The slender outer 

 ramus is similarly armed. 



' The whole of the back is thickly sprinkled with dark stellate markings to the end 

 of the fifth pleon segment, the compound terminal segment except just at the base and 

 the uropods being quite clear of markings and colour, a peculiarity to which the specific 

 name alludes. 



Length, 4'.5 ami., breadth nearly half the length. 



Habitat. Barawon, Blanche Bay, New Britain. 



The species that most nearly approach the present one are Cirolana neglecta, 

 Hansen, from the Mediterranean, Cirolana gracilis, Hansen, probably from the West 

 Indies, and Cirolana latistylis, Dana, from Straits of Balabac, north of Borneo. C. neg- 

 lecta is thrice as long ; C. gracilis, which is 8 mm. long, has the second joint of the fifth 

 peraeopods no wider than that of the thii-d ; so that these cannot well be confused with 

 the species above described. Dana's species, however, being only ' three lines long ' or a 



