CRUSTACEA FROM THE FALKLAND ISLANDS. 351 
some being a uniform brown, while others long retain signs of 
a brilliant marbling, such as that suggested by Dana of purple 
patches on a yellow ground. 
Gen. Casstprnopsts Hansen. 
1905. Cassidinopsis Hansen, Quart. J. Microsc. Sci. vol. xlix. 
pp. 77, 82, 87, 90, 94, 106, 109, 128, 130. 
Hansen places this genus in his group Spheromine eubranchiate, 
with the definition, ‘“‘ Head small, narrow in proportion to largest 
breadth of thorax. Basal joint of antennule without process 
from the distal posterior angle. End of abdomen feebly 
emarginate. Uropoda similar in both sexes; endopod laterally 
expanded, very much broader and a little longer than exopod. 
Both sexes similar, without processes ; female with normal 
mouth-parts and the brood in internal pouches.” He states that 
“the type is Cassidina emarginata (Guér.), which in many 
important points—structure of plp.’ and plp.’, shape of epistome, 
mandibles, fifth joint of mavxillipeds, end of abdomen—differs 
strongly from the type for the genus Cassidina, C. typa (M.-Kdw.).” 
CASssIDINOPSIS EMARGINATUS (Guérin-Méneville). 
1843. Cassidina emarginata Guérin - Méneville, Icon. Regne 
Animal, Crust., texte, p. 31. 
1900. 3 Stebbing, Proc. Zool. Soc. London, 
p- 562 (with synonymy). 
1905. Cassidinopsis ,, Hansen, Quart. J. Microse. Sct. 
WOM, aeiixee yon CWle 
1910. * e Hodgson, Nat. Antarct. Exp. 
vol. v. p. 4. 
1911. Cassidina Ortmann, Princeton Univ. Exp. 
Patagonia, vol. 111. p. 650. 
The pigmented portion of the eyes has a conical shape, the 
narrow end foremost. Mr. Vallentin at various dates obtained 
specimens of different sizes, especially at Roy Cove, from fronds 
of Macrocystis between 2 and 4 fathoms. 
VALLENTINIA, gen. NOV. 
A member of the Spheromine eubranchiate, near to Paracercets 
Hansen, 1905, but distinguished by not having the basal joint 
of the first antenne produced into an acute process, the mandibles 
of the female not coalesced with the head, the exopod of the 
uropods much shorter and narrower than the endopod, first 
gnathopod prehensile in the male. 
VALLENTINIA DARWINIE (Cunningham). 
1871. Cymodocea darwintt RB. O. Cunningham, Tr. Linn. Soe. 
London, vol. xxvii. p. 499, pl. 59. figs. Il, Ul ae 1, 
