“TERRA NOVA” EXPEDITION. 
80 
antennal scale slightly outreaches the antennular stalk, narrowing to a rounded end, 
which is barely outreached by the subterminal spine. All the flagella are broken short 
in the specimen. The third maxilliped outreaches the antennal scale by the whole of 
its slender, pointed end-joint and a small part of the penultimate joint, which is about 
one-third longer than the end-joint. The first leg slightly outreaches the antennal 
stalk. Its fingers are not quite twice as long as the palm, its wrist longer than the 
hand. The second leg reaches the end of the antennular stalk. The third leg is 
missing on both sides of the specimen. The fourth leg nearly reaches the end of the 
first joint of the antennular stalk. The fifth leg slightly outreaches the whole stalk. 
The legs are smooth save for a few scattered hairs. The petasma is slender and simple, 
and probably not fully formed in the specimen. The abdominal segments are simple 
in shape, but the sixth bears a spine in the middle of the hinder edge. The telson is 
shorter than either branch of the uropods. It is slender and ends in a sharp spine. 
Its upper surface is marked by a deep groove to within about one-third of its length 
from the free end, where two strong, fixed lateral spines stand. 
Length, 7 cm. 
One specimen, from Station 96. 
Family SERGESTIDAE. 
Sub-family SERGESTINAE. 
IV Y.t-zsj.z-i 
if. Sergestes atlanticus, II. M.-Edw., 1830. 
Sergestes atlanticus, H. M.-Edwards, Ann. Sci. Nat. (1) XIX, p. 349, pi. X, figs. 1-9 ; Hansen, 
Proc. Zool. Soc. Lond., 1896, p. 949. 
The Expedition took no adult members of this species, but at three stations in the 
. Nor th Atlantic there were obtained specimens of S. ancylops, Kr., 1859, which, 
according to Hansen, is a young form of S. atlanticus. 
Ten specimens were taken at Stations 45, 46, 66. 
3. Sen/estespacific ns, Stm., I860. 
Sergestes pacijicus, Stimpson, Proc. Acad. Philadelphia, 1860, p. 45; Ortmann, Ergebn. 
Plankton-Exped., II, G, b, p. 30 (1893). 
This form has not hitherto been recorded from the Atlantic. Hansen merges it in 
S. atlanticus, but according to Ortmann the possession of a supraocular spine differ¬ 
entiates it from the latter species, and this is borne out by the figures of Bate 
(“Challenger” Maerura, pi. XVII1) and Kiyfyer (S', frisii, K. Dansk. Videnskab. Selsk. Skr. 
(5) IX, pi. I), which both show S. atlanticus without the spine. A similar case occurs 
among the Pontoniinae, where Periclimenes spintferus differs from P. getitthouavsi only 
by the possession of a supraocular spine. 
Eight specimens were taken at Stations 49, 50, 68. 
'V'J.t.ZppH 
