Classification of the Thalassinidéa. 543 
is distinctly shorter than the movable finger, and there is a 
small sharp tooth on the fore edge of the carapace over the 
antenna.” 
Species : 
Type. U. stellata (Mont.), 1808. Tr. Linn. Soc. ix. A, B. 
U. littoralis (Risso), 1816. Crust. de Nice. [=U. lacustris, Costa, 
1844,= U. venitrarum, Nardo, 1847.] A, B. 
U. affinis (Say), 1817. Journ. Ac. Philadelphia, i. E. 
U. capensis * (Krauss), 1843. Stidafrik. Crust. S. 
U. hirtifrons (White), 1847. P.Z.S. PF. 
U. major (de Haan), 1849. Fauna Japonica, Crust. I. 
U. pugettensis (Dana), 1852. U.S. Expl. Exped., Crust ii, [=U. cal- 
fornica, Stimps., 1854.] HH. 
U. carinicauda (Stimps.), 1860. Proc. Ac. Philadelphia. I. 
U. subspinosa (Stimps.), 1860. aa hp I. 
U. barbata (Strahl), 1862. Mon.-Ber. Ak. Berlin, 1861. I. 
U. longipollex (Streets), 1871. Proe. Ac. Philadelphia. G. 
U. spinigera (S. I. Smith), 1871. Rep. Peabody Ac. 1869, G. 
U. Dana (Miers), 1876. Ann. & Mag. Nat. Hist. (4) xvii. [= U. hirti- 
rons, Dana, 1852.| F. 
U. rugosa (Lockington), 1878. Ann. & Mag. Nat. Hist. (5) ii. F, 
U. Sumsoni (Thompson), 1893. Proc. Roy. Soc. Tasmania, 1892, F. 
U. africana (Ortm.), 1894. Jena Denkschr. viii. v. I. 
U. furcata (Aurivillius), 1898. Bih. Svenska Ak, xxiv. iv.i. C. 
 U. spinifrons (Haswell), 1882. Proc. Linn. Soc. N.S.W. vi. F. 
Genus Gesicuta, Alc., 1901. 
Definition : “‘ Upogebiinze with the legs of the first pair 
simple, those of the second pair also simple, those of the fifth 
pair chelate, and the two branches of the last limb foliaceous, 
larger than the telson.” 
The distinctness of this genus from Upogebia is doubtful. 
According to Haswell’s figure (Cat. Austral. Crust.) the first 
leg of U. spinifrons would appear to be simple; but in his 
definition of the genus he makes no exception to the rule 
that the limb is subchelate, and in his definition of the species 
he does not allude to the point. The last leg is chelate in 
Gebiopsis Darwint, and in several other species is subchelate. 
The telson of U. Simsoni seems to be shorter than the last 
limb, but the figure given by Thompson is rather hard to 
understand, the limbs being drawn outwards from the telson. 
Alcock’s description and his figure, which is from the side, 
are also not clear on this point, but, so far as they can be 
followed, the last limb in Gebicula seems to be of a more 
primitive shape than that of Upogebia. 
Species : 
Type. G. exigua, Alc., 1901. Ind, Deep-sea Macrura and Anomala. I. 
* The remarkable fact, mentioned by Stebbing (South Afric. Crust. i.), 
that this species has gills on the last pair of legs, will probably make it 
needful to separate it as a subgenus with such others as may share the 
character, 
