47 



347 



the niaxillipeds nearly vertical. The maxilliped is shaped much as in the type 

 species T. anomalipes Miers (Ann. Mag. Nat. Hist. (5), VIII, pi. XIV, fig. 2 b, 1881), 

 but the propodus is as wide as long. 



Chelipeds short, equal; merus with a superior subterniinal spine; wrist smooth 

 and bare except near the inner angle, where it is sharply granulate and hairy. 

 Palms higher than long, granulate, granules arranged only partly in rows, lower 

 edge bordered by a row of prominent sharp tubercles continued half way on the 

 thumb. Dactylus spinulous above. Fingers narrowly gaping. 



Second leg much larger than the first and third , which are subequal ; upper 

 margin of merus of second leg spinulous. 



Margins of chelipeds and legs and also the pterygostomian regions long-hairy. 

 Margins of sternal segments and of abdomen furrj^. 



Third and fourth segments of c? abdomen fused, and also the fifth and sixth. 

 The terminal segment projects between the tips of the dactyli of the two outer 

 niaxillipeds. The appendages of the first segment are much longer than the abdomen 

 but do not project beyond it; their extremities being doubly recurved, forming 

 together a figure 8. 



Length of c? 9 mm., width 12-6 mm., width across front and orbits 5 mm., 

 greatest width of front 28 mm. 



Type locality. — N. of Koh Kut, 10 fath.; I. 23: 1 d*. 



This species differs from T. anomalipes Miers (Op. cit., p. 261, pi. XIV, fig. 2) 

 in its narrower carapace, shorter, stouter claws and smaller third leg. 



Thaumastoplax chuenensis Rathbun. 



Thaumastoplax chuenensis Rathbun, Proc. Biol. Soc. Washington, XXII, 113, 1909. 



Fig. .34. Thaumastoplax chuenensis, type cf. "l-S mm. wide. 



Fig. 35. 



Thaumastoplax chuenensis, 



type d", 4-8 mm. wide: 



a, maxilliped; b, chela. 



Differs from T. orientalis in a little narrower carapace, about one and one-third 

 times as broad as long, with the gastric region sharply outlined, the cardiac region 

 less distinctly so, the branchio-hepatic groove faint; antero-lateral margin less angled; 

 fronto-orbital distance greater, one-half width of carapace; front widest at its lower 



