CRUSTACEA FROM THE FALKLAND ISLANDS. 367 
body is much less conspicuously dentate than in any other 
described species of the genus, having a medio-dorsal tooth 
extended backwards only on the second, third, and fourth pleon 
segments, this tooth being flanked on the third segment by a 
very small pair of additional teeth, which may be present also on 
the second segment but were not perceived. The mouth-organs, 
both gnathopods, uropods, and telson, are in close agreement 
with those described and figured by Chevreux for P. fissicauda, 
15 mm. in length. In the first maxille, however, there is only 
one seta on the narrowly oval inner plate, and few sete on the 
single-jointed palp. The inner margin of the inner plate of the 
second maxille could not be made out. The fifth joint in the 
first gnathopods is not longer than the sixth, but in the other 
species the difference in length appears to be very slight. In the 
fourth pereeopods the second joint has a convex hind margin, not 
a sinuous one as in the species compared. The telson does not 
reach the end of the third uropods, and each of its long narrow 
lobes has three or four spines along its outer margin with two 
unequal spinules at the apex. The flagellum of the first antennz 
is composed of fourteen joints, that of the second is more slender 
with nine joints; in both pairs the joints in general being con- 
siderably longer than broad. Hach of the two specimens mea- 
sured 2°5mm. The one dissected contained numerous eges, and, 
whatever allowance is made for variability, I think it would be 
scarcely reasonable to regard this matron, a tenth of an inch long, 
as belonging to the same species as a congener over thirty times 
her bulk. 
Locality. Stanley Harbour, in seaweed at low water of spring 
tide. 
Fam. TALITRID&. 
1906. Valitride Stebbing, Das Tierreich, vol. xxi. pp. 8, 523, 735. 
1913. a G. M. Thomson, Tr. N. Zealand Inst. vol. xlv. 
p. 243. 
Thomson is ‘inclined to reduce Zalitrus, Talitroides, Orches- 
toidea, Talorchestia, and Parorchestia to Orchestia.” But to play 
the part of Saturn swallowing his children, he should have chosen 
Talitrus in preference to Orchestia. Calman in 1912 agrees with 
him in questioning the independence of Vulitroides. 
Gen. TAuorcHestrA Dana. 
1852. Talorchestia Dana, Amer. J. Sci. ser. 2, vol. xiv. p. 310. 
1906. . Stebbing, Das Tierreich, vol. xxi. p. 543. 
1907. ee Chevreux, Mém. Soc. Zool. France, vol. xx. 
p- 495. 
TALORCHESTIA SCUTIGERULUS (Dana). 
1853-5. Orchestia scutigerula Dana, U.S. Expl. Exp. vol. xiii. 
p- 863, pl. 58. fig. 2. 
1862. es Me _ Bate, Catal. Amph. Brit. Mus. 
p- 26, pl. 4. fig. 7. 
