28 STALK- AND SESSILE-EYED CRUSTACEA 
Mauritius, throughout the Indian Ocean, on the Coasts of China, Japan, 
and Australia, and at the Fiji Islands. 
THALAMITA. 
Thalamita, Latr. (part) Regne Animal de Cuvier (ed. 2) iv, p. 33, 
(1829) ; M. Edw. (part) Hist. Nat. Crust. i, p. 457, (18384); Dana, U.S. 
Explor, Exped. xii, Crust. part i, p. 280, (1852) ; A. M. Edw. Archiv. 
Mus. Hist. Nat. x, p. 854, (1861). 
Carapace almost quadrilateral, and very wide. Frontal margin very 
large, occupying with the orbits nearly the whole width of the carapace. 
Latero-anterior margins forming nearly a right angle with the front, 
with only four or five teeth. Basal joint of the external antenne very 
large, flagellum excluded from the orbit. Median suture of the 
sternum extending over the three last segments. Anterior legs armed 
with spines. Fifth pair of legs with a spine upon the inferior margin 
of the thigh. 
29. Thalamita sima. 
Thalamita sima, M. Edw. Hist. Nat. Crust. i, p. 460, (1834); A. M. 
Edw. Archiv. Mus. Hist. Nat. x, p. 359, (1861). 
Thalamita arcuatus, De Haan, Faun. Japon. Crust. p. 43, pl. ui, 
fig. 2, and pl. xii, fig. 1, (1835). 
Carapace clothed with short hairs, and with prominent naked trans- 
verse lines. lLatero-anterior margins five-toothed, the fifth tooth 
slightly longer than the rest. Front four-toothed, the two median 
teeth very wide, and separated by a very narrow median fissure, the 
two lateral much smaller, with the front margin arcuate. Basal joint 
of the external antenne with a smooth, entire ridge. Anterior legs 
robust; arm with transverse squamiform lines, its anterior margin 
with two or three spines. Wrist with three spines, the inner very long 
and acute. Hand with five spines above, three on the outer and two 
on the inner margin, outer surface longitudinally costate. Penultimate 
jomt of the natatory legs smooth, not denticulated below. Length 
about 1 im.; breadth nearly 13 in. (A. M. E,). 
New Zealand (Coll. Brit. Mus.). 
This is a common and widely distributed species; it ocenrs in the 
Red Sea, Indian Ocean, and on the Chinese, Japanese and Australian 
coasts, 
