I. '08. 



73 



The eyestalks are wide at the base and naiTower distally ; 

 they bear a rounded, irregular facetted and unpigmented cor- 

 nea which is not wider than the stalk. On their interior and 

 superior aspect the stalks bear a small but rather conspicuous 

 ocular papilla near the cornea. The <nitennidar peduncle 

 reaches to about three-fifths the length of the antennal scale ; 

 the basal joint is longer than the two distal combined and 

 bears externally a short, acutely pointed lateral process which 

 does not nearly reach to the distal end of the segment. The 

 antennal scale is rather less than half the length of the cara- 

 pace and is about three times as long as wide ; its outer 

 margin is practically straight and terminates in an apical 

 spine which reaches to or slightly beyond the narrow apex of 

 the lamellar portion. 



The mandible bears a three-jointed palp, in which the pen- 

 ultimate joint is nearly twice the length of the ultimate. In 

 the second maxillae (fig. 2) the two lobes of the basus do not 

 project conspicuously beyond the coxa as they do in the allied 

 genera, while in the first maxiUipedes (fig. 3) the endopod is 

 composed of two joints, a very short basal and a long distal 

 (this being one of the chief distinctions between Hymenodora 

 and other Hoplophoridae). The third maxiUipedes reach 

 about to the apex of the antennal scale ; the long exopod ex- 

 tends to the middle of the penultimate segment. 



The first two pairs of pereiopods are about equal in length, 

 the foremost reaching a little beyond the middle of the an- 

 tennal scale; in both, the carpus is rather less than half the 

 length of the chela, while the dactylus is a little more than 

 half the length of the palm. The third pair reaches beyond 

 the apex of the antennal scale by the whole of the long styli- 

 fomi dactylus; the fourth pair is almost exactly the same 

 length and also possesses a long dactylus — this joint being 

 only a trifle less than half the length of the propodus. In 

 both these pairs the ischium is shorter than the merus. In 

 the fifth pair of legs, which reaches to about one-third the length 

 of the antennal scale . the ischium is longer than the merus ; 

 the dactylus is extremely short and almost concealed by a 

 fringe of long setae from the distal end of the preceding joint. 



All five pereiopods bear long exopods ; the branchial formula 

 is : — 



i 



1 



vn. 



VIII, 



"■I 



X. 



XT. 



i"" 



TTTT. 



XIV. 



Podobranchiae, 



ep. 



ep.+l 



ep. 



ep. 



ep. 



; ep. 



... 



... 



Arthrobrauchiae, 





... 



2 



1 



1 



1 

 1 



1 



... 



Pleurobranchiae, 









1 



1 



1 



1 



1 



The podobranch on the second maxillipede was first noticed 

 by Smith {H . gracilis, 1886) ; it is sometimes represented by a 

 few lamellae only and in many cases is totally absent. 



The outer uropod is longer than the inner and is four and a 

 half times as long as wide. 



