92 PROCEEDINGS OF THE NATIONAL MUSEUM VOL. 120 
Basal antennal joint: Much shorter than orbit, bearing short 
inconspicuous crest composed of fused granules. 
Chelipeds: Typically equal in females and with right stouter than 
left in males. Anterior border of arm bearing two spines and tubercle, 
or three spines. Wrist with usual spines, that on inner margin being 
unusually long, about two-fifths length of palm. 
Hands coarsely granular on upper surface, under surface with 
squamiform markings (sometimes faint). Upper surface with indis- 
tinct inner and outer carinae, each bearing a spine somewhat distal to 
center and terminal tubercle. Outer surface with indistinct upper 
and distinct central and lower carinae, uppermost being the most 
granular. Fingers short, stout. 
Fifth leg: Merus short (length about twice breadth). Propodus 
without posterior spines. 
Male first pleopod: Short, stout, tip flared. No subterminal arma- 
ture on inner side (paratype) or only single sharp bristle showing from 
under row (holotype). Outer subterminal armature an_ elongate 
sparse row of long, thin, forwardly directed bristles concentrated just 
behind tip. Under surface with transverse row of two to four short 
sharp bristles just behind membrane, and general but sparse distribu- 
tion of long forwardly directed bristles continuous with those of 
outer side. 
Remarxs.—Differs from T. poissonit markedly in the form of the 
male pleopods. In T. poissonii the tip is recurved, and the outer 
subterminal armature consists of long stout spines almost at right 
angles to the appendage. 
The differences in the general facies are: Chelipeds are more granular 
and spinous with clearly recognizable carinae on outer surface of hand; 
frontal lobes have characteristic sinuous outlines; and propodus of the 
fifth leg is without spines. 
The male pleopod greatly resembles that of JT. sezlobata, but this 
species differs obviously in its 4-lobed front. 
DisTRIBUTION.—Previously Japan. 
Thalamita quadrilobata Miers 
Thalamita quadrilobata Miers, 1884, pp. 539-540, pl. 48 (figs. B, b). Alcock, 1899, 
pp. 84-85.—Stephenson and Hudson, 1957, pp. 349-350, figs. 2G, 3G, pls. 4 
(fig. 4), 8M, OF. 
Marertau.—Philippines: Nearougas I., shore, coral head, Feb. 10, 
1908, Alb., 1 female. 
Melanesia: An-ki, Malaita, Solomon Is., Apr. 23, 1929, Herre 
collection, 1 ovig. female. 
Palau Is.: Palau Is., Oct. 13, 1933, Herre collection, 1 ovig. female. 
