26; 



obtained, we come to the remarkable conclusion that at smaller depths the eyes show 

 generally a darker colour than in deeper water. 



The antennular peduncle reaches not yet to the middle of the antennal scale; the 2'"' 

 joint appears in the female almost twice as long as thick and twice as long as the 3"', in the 

 male, however, the 2"^' joint is slightly broader than long and hardly longer than the 3'^'; 

 stylocerite acuminate, as long as basal article. The thin inner ilagellum of the male, 6 mm. 

 long, measures about three-fourths the length of the cara})ace, rostrum included ; the outer 

 flagellum is a little shorter, but considerably broader, the basal joint, nearly as long as 

 the 2"^' and 2>'^ joint of the peduncle taken together, is about twice as long as broad, the 

 following are much broader than long, while the last joints become gradually longer than broad ; 

 in the adult female the inner flagellum is hardly more than half as long as the carapace, 

 rostrum included, but the slightly shorter outer flagellum is not thicker or broader than the inner. 



Antennal scale (Fig. 63/) resembling that of Pont, gracilis, a little more than half as 

 long as the carapace and 3,5-times as long as broad in the middle; the slender terminal spine 

 of the slightly concave, unarmed, outer margin reaches about as far forward as the rounded 

 ape.x. In all the specimens from the Stations 45, 211, 316 and in the larger specimen from 

 Stat. 88 the scaphocerite appears a little shorter than the distance between the ape.x of the 

 rostrum and the cardiac spine, in the smaller specimen from Stat. 88 and in the specimens from 

 the Stations 178 and 300 it is a little longer than that distance. 



The external ma.xillipeds reach in the adult female by half their terminal joint beyond 

 the antennal scale, in the male from .Stat. 300 they are incomplete; terminal joint, in the female, 

 nearly as long as the penultimate, not longer. 



The i^' pair of peraeopods (Fig. 63y'), that bear a rudimentary e.xopodite, project in the 

 female by one-fourth the propodus beyond the antennal scale, in the male they hardly reach 

 beyond it. Merus with a small spine at the far end of the upper border; carpus with a minute 

 spine at the upper end of the distal outer margin and with a much larger at the lower end, a 

 third spine, smaller than the last one, exists at the inner .side of the distal margin inferiorly. 

 Propodus a little more than 4-times as long as broad in the middle. 



The peraeopods of the 2"^' pair (Fig. 63 /(', 63/) reach to the middle or hardly beyond 

 the middle of the merus of the anterior legs. The chela is 2,5 — 2,7-times as long,as the carpus, 

 which is distinctly shorter than the palm and the chela appears about 6-times as long as 

 broad at the articulation of the dactylus; like in Pont, gracilis, the fingers, which are as 

 long as the palm, are gaping, the dactylus being distinctly curved; the single unguis, in 

 which the immobile finger terminates, measures -y, the entire length of this finger, while the 

 two equal ungues of the dactylus are much shorter, measuring Yi or '/-. *^^ '^^ whole length. As 

 regards the setae, implanted on this leg, it resembles Pont, gracilis (Tii. R. R. Stehhing, I.e.). 



When fully pronated, in the adult female, the two last joints of the filiform legs of the 

 3'''' pair and even one-fourth or one-fifth of the carpus reach beyond the antennal scale (in the 

 male these legs are incomplete). 



The stoutish peraeopods of the 4"' and 5''' pair are nearly of equal length, reaching by 

 the whole length of the vertically-compressed dactyli beyond the tip of the antennal scale; those 



