98 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
The limits of the genus Thalamita are already indefinite, and, as 
Stephenson and Hudson (1957, pp. 361-2) have noted, there is no 
logical separation from Charybdis. The recent discovery of a new 
species of Thalamita with spooned tips on the hands of the chelipeds 
(T. stephensoni Crosnier—see later) complicates the generic picture 
because it exhibits one of the diagnostic features of the genus Thala- 
mitoides. Another feature, the very spinous upper surface of the 
hands of the chelipeds, is shown by the present species, although, in 
other respects (e.g., carapace width), they are not closely related. 
Until more species are discovered on the various peripheries of the 
genus Thalamita, and the degrees of intergradation or segregation of 
such species with the remainder have been determined, it seems 
preferable to leave the genus with its present wide and indefinite 
boundaries. 
Thalamita stephensoni Crosnier 
Thalamita stephensoni Crosnier, 1962, pp. 140-142, figs. 241-248. 
Matertau.—Melanesia: New Georgia, received Jan. 10, 1945, 
W. A. Bartos, 1 male—carapace only (7 mm.). 
Samoa: Pago Pago, August 1902, Alb., 1 ? male (10 mm.). 
RemArkKs.—Frontal lobes in the 7 mm. specimen are perfectly 
straight, and the external angles are sharp instead of rounded. 
The male pleopod differs from that figured by Crosnier (figs. 243- 
245) in possessing only three spines on the outer side, and one instead 
of two just behind the tip on the inner side. 
DistripuTion.—Previously only Madagascar. 
Thalamita stimpsoni A. Milne Edwards 
FIGURE 36 
Thalamita stimpsoni A. Milne Edwards, 1861, pp. 362, 367, pl. 35 (fig. 4).— 
Alcock, 1899, p. 79.—Sakai, 1939, pp. 4138, 416-417.—Stephenson and 
Hudson, 1957, pp. 356-359, figs. 2M, 3M, pls. 6 (figs. 1-3), 8R, 9I. 
MareriaALt.—Malay Peninsula: Koh Pipidon, Mar. 10, 1925, 
H. M. Smith, 2 males. 
China: AT-51, Namru-2, Taipei, Formosa, 12 mi. S. of Tau 
Hsui, seashore, Lighthouse Beach, 1 male. 
Philippines: Sta. 5144, Jolo Lighthouse, 6°05’50”N., 121°02’15”E., 
19 fm., coarse sand, Feb. 15, 1908, Alb., 1 male; Sta. 5145, Jolo Light, 
6°04’30”N., 120°59’30”E., coarse sand, shells, 23 fm., Feb. 15, 
1908, Alb., 1 male, 2 females, 1 ovig. female; Sta. 5147, Sulade I., 
5°41/40"N., 120°47/10”E., 21 fm., coarse sand, shells, Feb. 16, 
1908, Alb., 2 males; Sta. 5159, Tinakta I., Sulu Archipelago, Tawi- 
tawi, 5°11’50”N., 119°54’E., Feb. 21, 1908, Alb., 2 males, 2 ovig. 
females, 1 Sacculina infected female, 2 juvs.; Sta. 5164, Observation 
