66 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
The male pleopod and abdomen (figs. 23a—-c) are described in 
Stephenson and Rees (1961, pp. 423-424). This pleopod shows con- 
siderable resemblances to that of 7. trilineata Stephenson and Hudson 
(1957)(=T. demani Nobili), the differences being extra subterminal 
bristling on the outer side in 7’. trilineata where there is a relatively 
close packed elongate patch or double row. The species as a whole 
is close to 7. demani but differs in the relatively narrower lateral 
frontal lobes (one-fifth instead of one-third breadth of the medians) 
and in the median cardiac ridge of the carapace being separated 
from the mesobranchials. 
Ficure 23.— Thalamita corrugata Stephenson and Rees, 8 mm. male, Tuamotus and Societies, 
Sta. 10a—57, Bredin: a, pleopod; b, pleopod tip, upper surface; c, abdomen. (Scales=a, 
1 mm.; d, 0.5 mm.; c, 1 mm.) 
DistTRIBUTION.—Queensland and the Gilbert Is. 
Thalamita crenata (Latreille) 
Portunus crenatus Latreille, 1829, fide H. Milne Edwards, 1834, p. 461. 
Thalamita crenata (Latreille)—Alcock, 1899, pp. 76-77.—Sakai, 1939, pp. 413- 
415, pl. 84 (fig. 3)—Edmondson, 1954, pp. 267-269, figs. 39b, 40a-f.— 
Stephenson and Hudson, 1957, pp. 332-334, figs. 2Q, 3Q, pls. 2 (fig. 3), 7F, 
9C.—Sankarankutty, 196la, pp. 106-107.—Crosnier, 1962, pp. 130-132, 
figs. 220, 226-227, 232-233. 
Materiau.—Malay Penninsula: Allfrom Siam: Taleui I., Sept. 27, 
1923, 1 male (front damaged, median lobes confluent), 2 ovig. females; 
Koh Chang, Jan. 14, 1924, 1 dried male (left median and lateral 
