834: THE VOYAGE OF H.M.S. CHALLENGER. 



partially coalesced with the siJe-plate ; it is very broad, twice as broad as long, with 

 three long setiB near the top of the front border, and a spine at its apex, the hinder 

 border sinuous, the lower border behind also sinuous, meeting the other in a sharply 

 outdrawn angle ; the second joint short, but broader than usual, overlapped behind by 

 the inner part of the first joint ; the third joint of great breadth, distally exceeding the 

 breadth of the first joint, with spines at six points of the hinder margin, at the top a 

 single spine, the rest in groups ; small spines at five points of the front margin ; seven 

 rows of spines along the distal border, the longest being that nearest to the front apex; 

 the fourth joint broad, narrowing a little distally, not quite so long as the third, with two 

 groups of spines on the hind margin, four on the front, four on the distal. The rest of 

 the limb broken off. 



Pleopods. — Some setae on the sides of the peduncles ; the coupling spines two in 

 number, rather swollen at the base, otherwise slender, flat-topped, with one lateral hook 

 a little way below the apical one ; the cleft spines four in number on the first and 

 second pairs, seemingly only three on the third pair ; the joints of the rami numbering 

 from twelve to fourteen ; the rami not powerful. 



Uropods. — Peduncles of the first pair not longer than the outer ramus, with two or 

 three spines on the upper margin, and a long tooth at the apex of the lower ; the rami 

 slender, the outer rather longer than the inner, bordered with five spines at intervals on 

 the upper margin, and a group of long ones at the apex by the side of a small tooth or 

 nail ; the inner ramus has three spines on the margin and the apical group ; the edges 

 are pectinate ; peduncles of the second pair shorter than the outer ramus, carrying 

 some strong spines on the edges ; the outer ramus considerably longer than the inner, 

 each with spines at two points of the margin, and a group at the apex ; as in the pre- 

 ceding pair, the rami are nearly parallel-sided. The third uropods were unfortunately 

 missing. 



Tehon small, longer than broad, narrowing slightly to the strongly emarginate 

 termination, forming a sharp point at each side of the emargination which reaches up for 

 not quite a quarter of the telson's length ; there are four spines on each of the nearly 

 straight lateral margins, and two long setiform spines arise on the surface just over the 

 emargination. 



Lengtli. — The specimen, in the position figured, measured, from the rostrum to the end 

 of the perseon, one-fifth of an inch. 



Locality. — -Port Jackson, Australia, from a depth of between 2 and 10 fathoms. Two 

 specimens. 



Remarks. — Unfortunately both specimens were defective ; the one from which the 

 head and perseon have been figured was without the pleon, this, as shown by the mar- 

 supial plates, being a female ; the other, from which the pleon has been figured and 



