CRUSTACEA FROM THE FALKLAND ISLANDS. 355 
AMPHIPODA. 
Tribe GAMMARIDEA. 
Fam. LySraNASSID&. 
1874. Lysianasside Buchholz, Zweite D. Nordpolarf. vol. ii. 
p. 299. 
1913. bighs Chevreux, Deuxiéme Exp. Antarct. francaise, 
p- 87. 
Gen. TRYPHOSITES Sars. 
1891. Tryphosites Sars, Crust. Norway, vol. i. p. 81. 
1906. Pi Stebbing, Das Tierreich, vol. xxi. p. 77. 
SNe _ Sexton, Ann. Nat. Hist. ser. 8, vol. vii. p. 510. 
1912. 54 Chilton, Tr. Roy. Soc. Edinb. vol. xlvili. pt. 2, 
p- 469. 
To receive the new species here referred to this genus, its 
definition must be a little modified, by withdrawal of the state- 
ment that the postero-lateral angles of the third pleon segment 
are acutely upturned, nor does the shape of the hand in the 
second gnathopod precisely conform with that in the type species, 
Also the inner ramus of the second uropod is not constricted. 
TRYPHOSITES CHEVREUXI Stebbing. (Pl. IIT.) 
Abstract P. Z.S. 1914, p. 30. (April 28.) 
The third pleon segment, instead of having the postero-lateral 
corners upturned with a smooth concave margin above, has the 
lower half of the postero-lateral margin convex and cut into 
a serration of nine little teeth. Thus the species is sharply dis- 
tinguished both from 7”. longipes (Bate & Westwood) and from 
Hoplonysx stebbingi Walker, 1903, which Chilton in 1912 transfered 
to V'ryphosites, with the remark, among others, that it “ appears 
to be very close to 7’. longipes of northern seas, differing chiefly 
in having the perzopoda shorter and stouter and the eyes in- 
distinct.” Walker lays some stress upon “the absence of a 
depression ” dorsally in the fourth pleon segment. Such a de- 
pression is sometimes masked by the telescoping of the segment. 
In the new species the depression is very marked. 
Eyes obscure or absent. Both pairs of antennee strongly 
resembling those of 7’. Jongipes. Accessory flagellum in first pair 
of the male 7-jointed, principal with 16 joints, some of which 
carry small calceoli. Flagellum of second pair not so long as the 
body, with 32 joints, several of the alternate ones carrying cal- 
ceoli, decreasing in size on the distal portion. Mouth-organs in 
close agreement with those of 7’. longipes. 
The gnathopods differ from those of the two earlier species in 
scarcely anything but the hand of the second pair, which is not 
Proc. Zoou. Soc.—1914, No. XXIV. 24 
