CRUSTACEA OF THE MERGUI ARCHIPELAGO. 79 
state of the fourth antero-lateral tooth, but entirely agreeing 
in all other characters. 
The shape of the male abdomen is also characteristic of 
T. Dane. : 
The Leyden Museum contains specimens of Thalamita Dane 
from Amboina, Waigiou, Timor, Ceram, and Padang; and it 
has also been recorded from Auckland by Heller, from Hong- 
kong and Java by Stimpson and Milne-Edwards, and from 
Mozambique by Hilgendorf. 
55. THALAMITA CRENATA, Latr. 
Portunus crenatus, Latreille, Collection du Muséum. 
Thalamita crenata, Riippell, Krabben des Rothen Meeres, 1830, p. 6, 
Taf. i. fig. 2; Milne-Edwards, Hist. Nat. des Crustacés, p. 461 ; Stimpson, 
l.c. p. 37; Alph. Milne-Edwards, Archives du Muséum Hist. Nat. 1861, 
t. x. p. 365, and Nouv. Arch. du Muséum Hist. Nat. 1873, t. ix. p. 166; 
Hilgendorf, Monatsber. k. Akad. d. Wiss. Berlin, 1878, p, 800. 
One male specimen was collected at King Island. 
The distance between the last antero-lateral teeth measures 
60 millim. Thalamita crenata is sharply defined and distin- 
cuished from the preceding species by the absence of longitudinal 
crests and granulations on the outer and inner surfaces of the 
hands, which are very convex and nearly wholly smooth. As 
regards the shape of the cephalothorax, and more especially the 
shape of the frontal lobes, these two species, however, almost 
completely agree with one another. 
Thalamita crenata is represented in the Leyden Museum by 
specimens from the Red Sea, from the island of Nossy-Faly, 
near Madagascar, fron the Moluccas, Banda, Waigiou, Timor, 
and Macassar; also by specimens from the shores of Padang, 
Sumatra. 
This species is, moreover, recorded from the coasts of China, the 
Loo-Choo Islands, Pondicherry, Java, the Nicobar Islands, and 
Mozambique. It seems, therefore, to be distributed throughout 
the whole Indo-Pacific Region from the Red Sea and Mozam- 
bique as far as the shores of China and the Marquesas group. 
Genus Gontosoma, Alph. M.-Hdw. 
56. Gontosoma cruciFEeruM, Fabr. (Pl. V. fig. 1.) 
Portunus crucifer, Fabricius, Suppl. Entom. Syst. p. 364. 
Thalamita crucifera, Milne-Edwards, Hist. Nat. Crustacés, i. p- 462. 
