82 
1884. Sergestes arcticus, Smith, Rep. U.S. Fisheries for 1882, p. 
415 (71), PL..8: fig: 2: 
1886. Sergestes arcticus, Smith, Rep. U.S. Fisheries for 1885, 
p:'92; ‘Pl.ig0;, figs:ry 2: 
1888. Sergestes atlanticus (part) Bate, Challenger Macrura, 
Reports, Vol. XXIV., pp. 389, 394, 436. 
1888. Sergestes magnificus, Chun, Bibliotheca Zoologica, Vol. I., 
P33) Plca ies:-4; 5: 
1893. Sergestes arcticus, Ortmann, Decap. und Schizop. Plank- 
ton—Exp., pp. 30, 33. 
1896. Sergia meyert, Ortmann, Grundziige der marinen Tier- 
geographie, p. 76 (footnote). 
1896. Sergestes avcticus, Hansen, Proc. Zool. Soc. London, pp. 
949, 954. 
1901. Sergia magnifica, Lo Bianco, Mittheil. Stat. Neapel, 
Vol. XV, pp. 413, 434. 
1903. Sergestes arcticus, Hansen, Proc. Zool. Soc. London, pp. 
50; 60, Pl: 12; tiem aa 
In regard to this species a large amount of information has 
been from time to time made available, but it is somewhat 
scattered. Some details are here repeated to make it clear 
that the specimens dealt with really belong to the species in 
question. 
The very short, almost horizontal rostrum, with a vertically 
truncate portion of the frontal margin on either side, agrees with 
Metzger’s fig. 7b and Hansen’s figs. Ia, 1b. The latter author 
uses this feature in distinguishing Kréyer’s species from his own 
S. similis, in which the rostrum is longer, more upturned, and 
flanked by convex pieces of margin. The supra-ocular and 
hepatic spines are well developed, and the gastro-hepatic groove 
distinct. The telson, which is fringed for a _ considerable 
distance with long plumose hairs, ends in a sharp apical point, 
but in the specimen dissected has not the lateral points strongly 
produced as represented by Metzger. The eyes are about two- 
thirds as long as the first joint of the first antennae, a character 
used by Ortmann to distinguish this species from S. kréyert, 
Bate, in which they are about half as long as that joint. 
In the first antennae the broad first joint, measured from its 
base to the rounded apex, is almost as long as the narrow second 
and third combined, measured along their inner margin, the 
propertion being as 38 to 39. The tooth on the outer margin 
of the first joint is, as shown by Kroyer, not very prominent nor 
deeply cut. The third joint is barely or not quite as long as the 
second measured on the inner margin, though somewhat longer 
on the outer margin. 
