I. '08. 



27 



of which the proximal one is almost as long as the remaining 

 four taken together. 



The first pair of pereiopods, which is not chelate, reaches 

 slightly beyond the middle of the antennular peduncle. The 

 merus is long and about equal to the slender multiarticulate 

 propodus ; the dactylus is distinct but very minute and is pro- 

 vided with a single long seta. The second and third pairs 

 possess a minute but perfectly formed chela ; the latter are 

 considerably longer than the former, and both when stretched 

 forwards reach beyond the apex of the antennular peduncle. 

 In both, the merus is slightly longer than the carpus, but a. 

 little shorter than the multiarticulate propodus. The distal 

 joints of all the first three pairs are provided with setae along 

 both margins, as a general rule long and short setae alternate 

 with one another. 



The fourth and fifth pairs are much shorter, strongly com- 

 pressed and laminar, and one of the joints, presumably the 

 dactylus, is missing. The posterior margins of both pairs are 

 clothed with numerous very long plumose setae, and a similar 

 but shorter fringe is found on the anterior margin of the is- 

 chium and merus of the fourth and on all the segments of the 

 fifth pair. The fourth pair w^hen stretched forw^ards reaches 

 to the distal end of the basal peduncular joint. The propodus, 

 or distal segment, is lanceolate and rather less than three 

 times as long as broad ; it is about equal in length to the 

 carpus, but is considerably shorter than the merus. The 

 fifth pair is little more than half the length of the fourth, 

 and is about two-thirds the length of the carapace. The 

 ischium, merus, and carpus are of about equal length ; the 

 lanceolate propodus is considerably shorter. 



There are no exopodites on the last two pairs of maxilli- 

 pedes or on any of the pereiopods. The branchial formula 



IS :- 





VIL 



vrrr. 



IX. 



1 



X. XL 1 xn. 



1 



xm. 



XIV. 



Podobranchiae, 



Arthrobranchiae, 



Pleurobranchiae, 



ep. 

 ... 



l+ep. ... 



! 



1. :l + L. 



... 



l + L. 



1+L. 



2 



2 



... 



Both the pleurobranchs over the base of the fourth pair of 

 pel eiopods are large and only slightly smaller than the pair 

 which precede them. The pleurobranch at the base of the 

 third maxillipede and one of those on each of the three suc- 

 ceeding somites is represented merely by a simple lamella 

 CL' in table). 



The complicated form assumed by the petasma^ of the male 



1 The minute hooks, sunk in pits, with which some of the stylets of 

 this organ are provided, have been described and figured by Smith 

 (1882). 



