1506 THE VOYAGE OF H.M.S. CHALLENGER. 



narrow ; the second joint much longer than broad ; the third longer than the second, 

 distally widened, with slightly convex hind margin ; the fourth slightly longer but 

 narrower than the third, a little widened distally ; the fifth shorter than the third, with 

 a minute hooked finger embedded in the rounded apex. 



Pleopods. — The two coupling spines very small, with apical hooks ; the cleft spine 

 slender, the longer arm having an elongate subapical dilatation ; the inner ramus with 

 six joints, the outer with seven. 



Uropods. — Peduncles of the first pair not so long as the rami, the outer margin 

 pectinate ; the rami long, lanceolate, reaching beyond the telson, the inner rather the 

 longer, each with the outer margin strongly pectinate, the inner margin more slightly 

 pectinate and serrate ; peduncles of the second pair short ; the outer ramus much shorter 

 and narrower than the inner, its outer margin with one or two teeth and a subapical 

 spinule, the inner margin pectinate, the inner ramus subequal to those of the first pair, 

 both margins pectinate ; peduncles of the third pair very short, the rami similar to those 

 of the second pair but smaller, and the inner ramus less strongly pectinate, the outer not 

 reaching to the end of the telson, the inner reaching beyond it. 



Telson broadly triangular, with rounded apex, the margin very minutely pectinate. 



Length, one-tenth of an inch, if fully extended. 



Locality. — January 1875, Zebu Harbour, Philippines ; surface. One specimen, 

 male. 



Remarks. — It is clear from the antennae it is not fully adult, although of the same 

 size as Glaus' specimens from the Atlantic. The shape of the fifth perseopods is inter- 

 mediate between that which Claus figures for the male and that which he figures for the 

 female. The tooth on the finger of the gnathopods is not figured by Claus, the process 

 of the wrist of the second gnathopods as he represents it does not entirely agree with that 

 in the Challenger specimen, and he gives a wider apex to the telson, but the differences 

 do not seem to justify the establishment of a new species. The little circular marks on 

 the front rim of the segments and on the outer surface of the first joints of the third and 

 fourth perseopods are very difficult of observation, nor was I able to discover whether 

 Claus' expression " Integument mit Grubenreihen " was properly applicable to them, 

 since I could not make out any depression of the surface in connection with them. 



Family Pronoice. 



In 1852 Dana made the Pronoinse the second subfamily of the Typhidse, with the two 

 genera Pronoe and Lycsea. Claus in 1879 made the Pronoidse the third family of the 

 Platyscelidse, with the genera Pronoe, Eupronoe, and Parapronoe. He defines it as 

 follows : — 



