CRfSTACKA MAl.ACOSTRACA. III. 22 , 



(fig. y l, a>) nearly as in 6'. rtongata; tliird peduncular joint shorter than the two proximal joints com- 

 bined and somewhat shorter than the 5-jointed flagellnm. Antenna: (a') nearly as in G. rlongata^ with the 

 flagellutn ft-jointcd. -- Maxillipeds (fig. gc) normal; the palp 4-jointcd, with the terminal joint a little 

 shorter and considerably more narrow than the penultimate joint First pair of thoracic legs (fig. 9 d) 

 in the main as in '/'. clongata, but the distal part of the shield-shaped joint has a somewhat long, 

 oblique terminal margin, and at its outer end the usual terminal joint, which is very small, oblong. 



The five large thoracic segments do not differ much in breadth (fig. 93); fourth segment nearly 

 as long as first and second combined, a little longer than the fifth and without any vestige of a 

 division in the median line, but with a couple of conspicuous impressed points a little from that line 

 and somewhat from the posterior margin; fifth segment with a couple of impiesscd points near the 

 median line and a little from the posterior margin. The two anterior segments show two or three 

 granules at the lateral margins; otherwise all five segments have the surface smooth, but the more 

 vaulted pair of sublateral areas are marked off at least on the three posterior segments. The walking 

 legs generally with two oblong protuberances on the lower margin of fifth joint, with a few articulated 

 spines on fourth, fifth and sixth joints together, and some few long pubescent seta: on second and 

 third joints (fig. 9 e). 



The abdomen (fig. 93) decreases a little in breadth backwards; the five anterior segments with- 

 out protruding lateral angles. Pleopods without seta:. Last segment (fig. 9 f) about as long as broad, 

 with the lateral margins feeble concave from near the base to the narrowly rounded end. Uropods 

 slightly, or not, overreaching the segment 



length 273-2 mm. - The whole surface of the male whitish, with the two pairs of impressed 

 points mentioned somewhat darker. 



Larva (figs. 9 g and 9 In. Completely blind; particulars as to the head and its antennula: and 

 antenna: may be seen on the figure. Last abdominal segment much longer than broad (fig. 9 In, and 

 much overreaching the uropods; the lateral margins are feebly concave, and the end is obtuse, narrowly 

 rounded. - - Length 37 mm. 



Remarks. The male of this small species differs from other northern forms, excepting G. tn- 

 color, by having the tergite of the penultimate leg-bearing thoracic segment undivided in the median 

 line; furthermore its complete blindness, the smoothness of the thoracic segments the shape of the last 

 abdominal segment, and the uniform, whitish colour afford excellent characters. The differences between 

 G. albesccns and G. bicolor are pointed out later on. 



Occurrence Not taken by the "IngolP, but the "Thor" has captured it at a single place, 



South-West of the Faroes: Lat. 6i 8 i5' N., Long. 935' W., 463515 lath.; 5 spec. (3^, 2 larvjc). 



163. Gnathia bicolor n. sp. 

 (PL XVI, figs. 10 a ioc). 



Male The single specimen is not fully three times as long as broad, but three and a half 

 times as long as the breadth of second leg-bearing thoracic segment, while the posterior segments are 

 broader, and especially the penultimate thoracic segment is considerably widened. - - Head almost as 



