22 8 CRUSTACEA MALACOSTRACA. III. 



projects so far forwards that it covers below most of the incision mentioned when the head is seen 

 vertically from above; if the head is seen obliquely from above and somewhat from behind, the incision 

 is extremely conspicuous, as the cover below cannot be seen. The lower wall of the head has in the 

 specimen figured (fig. 8b) its front margin somewhat convex; in a single specimen this margin is 

 indistinctly concave. — The other error committed by Sars is that he has overlooked the fact that 

 the upper side of the mandibles has a shorter or longer part of its proximal two-fifths raised as a 

 crest with about four to six teeth. — The major distal part of last abdominal segment is, as figured 

 by Sars, a very narrow triangle. 



Stebbing established his G. scliistifroiis on a single specimen, deriving the name from and laying 

 stress on "the frontal excavation, by which it is easily distinguished from its nearly allied Norwegian 

 species Gnathic/, abyssorum G. O. Sars". Of course, he could not know that Sars had overlooked that 

 incision. - - In other respects Sars' figures are satisfactory, and it is sufficient to refer to them, to his 

 text, and to the detailed description with many figures published by Stebbing. — The species is small; 

 the male only from about 2-5 to 3-5 mm. long. 



Occurrence. Taken by the "Iugolf" at three stations in the warm area. 



West of Iceland: Stat. 9: Lat. 64°i8' N., Long. 2fod W., 295 fath., temp. 58 ; 1 spec. (d"). 



South-West of Iceland: Stat. 81: Lat. 6i°44' N., Long. 27°oo' W., 485 fath., temp. 6-i°; 3 spec. 



(2d* and 1 larva; one o* in Halichondria tenuiderma Lundb.) 



South of Iceland: Stat. 55: Lat. 63°33' N., Long. I5°02' W., 316 fath., temp. 5-9°; 1 spec. (d 4 ). 



The "Thor" has gathered a male east of Iceland: Lat. 64°58' N., Long. i2°4o' W., 70 fath.; the 

 Ilnd Amdrup Exp. secured a male at Rathbone Island, at ab. Lat. 7o°4o' N., Long. 2i°3o' W. ; the depth 

 must probably have been either 159 or 94 fath. 



Distribution. Sars recorded it from two places in West Norway, viz. Hardanger Fjord, 200 

 fath., and at Hasvig, West Finmark, 150—200 fath. Stebbing's specimen had been taken west of Ire- 

 land in Lat. 53°42' N., i4°n' W., 208 fath. 



162. Gnathia albescens n. sp. 

 (PI. XVI, figs. 9 a— 9 h). 



Male (fig. 9a). Moderately slender, about three and a half times as long as broad. — Head 

 somewhat broader than long, only somewhat narrower than the penultimate pedigerous thoracic seg- 

 ment; the angles at the autennulEe protrude as oblong, short processes, while the major anterior part 

 of the side behind this process is feebly convex, with a broader tubercle anteriorly and behind this 

 a few teeth; the upper surface is deeply and rather broadly excavated in its anterior half to the front 

 margin, which is feebly convex with some small triangular teeth; each half of the surface has from 

 the lateral margin towards the median line and a little in front of the middle a transverse area with 

 a number of small granules. Eyes completely wanting. — Mandibles (fig. 9 b) not very different from 

 those in G. elongata; the cutting edge is rather concave, well marked off by a sharp angle from the 

 proximal part of the same margin, which is concave and longer than the cutting edge; the outer 

 upper margin has a protuberance near the middle, and its proximal half is smooth. -- Antennulse 



