332 32 



There must, therefore, remain some doubt as to the identity of the two forms until 

 the Pinnotherids of eastern Asia are better known. 



Our specimen, a female, has a thin and yielding skin, which is speckled with 

 fine black dots. Posterior margin a little concave. Orbits subcircular, invisible in 

 a strictly dorsal view; eyes black. Width offrent and orbits nearly one-third width 

 of carapace. 



Chelipeds stout, about as long as carapace; palms increasing in width distally, 

 about one and a half times a long as fingers; the latter are stout, the dactylus bears 

 an oblique tooth on its basal half, which fits in closing between two smaller teeth 

 on the pollex. 



Legs slender, especially the last pair, third pair longest, second and fourth 

 pairs subequal, first pair shortest; merus of third pair longest, second next, first and 

 fourth subequal; carpus of third pair longest, second pair next, others subequal; 

 third propodus longest, second and fourth subequal, first a little shorter; dactylus 

 of fourth pair distinctly longest, third pair next, first and second subequal. 



Mangrove swamp. Lem Ngob; XIL 23, 24, 27 ; 1 ? ovig. 



Besides the character of the endognath P. alcocki differs in having the fourth 

 pair of legs decidedly longer than first or second pairs. 



Pinnotheres lanensis Rathbun. 



Pinnotheres lanensis Rathbun, Proc. Biol. Soc. Washington, XXII, 109, 1909. 



Allied to P. parvulus Stimpson, but diff'ers from it chiefly by the shorter dac- 

 tylus of the endognath. 



A very small species, the single specimen taken (an egg-bearing female) measuring 

 approximately 24 mm. long and 2"7 mm. wide. The skin is very soft and thin so 

 that the shape as well as the size is difficult to determine with accuracy. There is 

 however, an antero-lateral angle or shoulder, and the anterior margin between these 

 angles is not strongly arcuate. The front is so much deflexed and incurved that 



the orbits are far from visible in dorsal view. The eyes 

 are distinctly pigmented. 



Last two segments of endognath mitten-shaped, the 



dactylus small and attached about half way back on the 



propodus and reaching about to its terminal fourth. 



Chelipeds considerably stouter than legs. Palm about 



one and a third times as long as fingers, widening 



Fig. 14. Pinnotheres lanensis, distally. Fingers stout, tips incurved, pollex wider at 



type?, 2-7 mm wide: bagg than dactylus. 



a, niaxi ipe , , c le a. qj. ^j^^ j^^^^ ^^^ second pair is a little longer than 



the first, its last three articles each very slightly longer than in the first pair. Third 



pair longest, last three articles each much longer than in second pair, dactylus twice 



as long as in second pair. Fourth pair subequal to first, its dactylus equal to that 



of third, propodus equal to that of second pair, carpus shorter than in any other pair. 



