CRUSTACEA FROM THE FALKLAND ISLANDS. 369 
(of Mr. Vallentin’s collection). The Hyalella was also “found in 
a freshwater stream some miles distant from Stanley,” where 
‘this species appeared to be fairly common.” 
Fam. AORID&. 
_1899. Aoride Stebbing, Ann. Nat. Hist. ser. 7, vol. iv. p. 211. 
Gen. Lemsos Bate. 
1857. Lembos Bate, Ann. Nat. Hist. ser. 2, vol. xix. p. 142. 
1906. »  Stebbing, Das Tierreich, vol. xxi. pp. 594, 737. 
1909. », Walker, Tr. Linn. Soc. London, vol. xii. p. 337. 
GOOF » Chilton, Subantarctic Is. of N. Zealand, p. 646. 
LeMBOS FUEGIENSIS (Dana). (PI. IX.) 
1853-55. Gammarus fuegiensis Dana, U.S. Expl. Exp. vol. xiii. 
p-. 954, pl. 65. fig. 8 a—-h. 
1862. Mera fuegiensis and M. fuegeensis Bate, Catal. Amph. 
Brit. Mus. p. 194, pl. 35. fig. 4. 
1906. Lembos fuegiensis Stebbing, Das Tierreich, vol. xxi. p. 600. 
1909. Lembos kerguelent Walker, Tr. Linn. Soc. London, vol. xii. 
p- 337, pl. 43. fig. 6. 
1909. (¢) LZ. kerguelena Chilton, Subantarctic Is. of N. Zealand, 
p-. 646, text-figs. 12 a, 0. 
In 1906 this species remained obscure, Dana having described 
and figured it only in the femalesex. While naming it fwegiensis 
as if it belonged to Tierra del Fuego, he assigned it to the “ Feejee” 
Islands. Now that Mr. Vallentin has obtained a male and a 
female specimen together from the Falkland Islands, I feel 
pretty sure that the “‘ Feejee” Islands was not the original locality, 
but assigned through some lapse of memory as the rendering of 
JSuegiensis, yet the distribution must be extensive, since Walker 
records the species from the Indian Ocean. 
The male differs from Lembos kergueleni (Stebbing), taken 
from a considerable depth at Kerguelen Island, by the hand of 
the first gnathopod, which has a differently sculptured palm, and 
also by the second joint of the second gnathopod, which is here 
not a broadly expanded oval as in the other species. The expan- 
sion, however, is also absent from the specimen which Chilton, in 
1909, identified with Z. kerqueleni, but that identification seems 
to me very doubtful, since the male here figured is apparently 
adult, to judge by the antenne and gnathopods, and the size 
slightly larger than that of the accompanying ovigerous female. 
It scarcely needs observing that the expansion of the second joint 
of the second gnathopod, though it occurs also in Hurystheus 
exsertipes, is a very unusual feature. In the present species the 
second joint is not expanded either in the gnathopods or in any 
of the perzeopods. 
The eyes are small and round. The first antenne have a long 
peduncle and longer flagellum, first joint of peduncle rather 
