84 SMITHSONIAN MISCElvIvANEOUS COLLECTIONS 



than below ; on the lower surface they are most regular and nearly 

 continuous, being interrupted only at the median groove. Anterior 

 margin of meros-joint with two strong curved teeth near the denti- 

 form outer angle, and six or eight small tuberculiform teeth toward 

 the base ; four small tubercles on the surface above and between the 

 large teeth. No teeth on the outer side of the meros. which is only 

 squamose. Carpus strongly squamose and pubescent ; a strong 

 spine at the summit and three small ones on the outer surface. 

 Hand with five spines above and two or three costje on the outer 

 surface ; fingers strongly grooved, the ridges between the grooves 

 smooth and glossy. Ambulatory feet pubescent; penult and ante- 

 penult joints grooved; penult joint of natatory feet with no spines 

 on its posterior margin, terminal joint with the sharp tip projecting 

 considerably beyond the margin. 



Colors in life : Above, obscured by the pubescence, blackish and 

 whitish mottled; below, bluish; mouth and parts adjacent, reddish; 

 pincers with black blotch at the middle, tips white. Dimensions of 

 the male: Length of carapax, 1.5; breadth, 2.48 inches. 



De Haan's T. arcuatns is perhaps the young of our species, but 

 the hands are described as smooth below. 



Found abundantly in sheltered bays near Hongkong, China, on 

 muddy bottoms, in 4 to 6 fathoms ; it also occurred in Caspar Straits 

 and at Simoda, Japan. 



128. THALAMITA CRENATA Riippell 

 Plate X, Fig. 6,6a 



Thalamita crcnata Rf ppEll, Krabben des rothen Meeres, p. 6, pi. v. fig. 2. 

 Milne Edwards, Hist. Nat. des Crust., i, 461 (?). 



Carapax glossy, free from pubescence except toward the margins. 

 Crest of basal joint of antennae not projecting beyond the frontal 

 margin. Outer surface of hand smooth. In some of our speci- 

 mens, as in those of Riippell, there are a few spines on the posterior 

 border of the penult joint of the natatory feet. Color in life dark 

 green above, paler below ; pincers dark red, with yellowish teeth. 



Taken in a seine from a small muddy creek in Napa Harbor, Loo 

 Choo, where it seems to be abundant ; also found at Hongkong. 



There are evidently two species confounded under the name T. 

 crenata, and we are somewhat in doubt as to which species the name 

 should be applied. Riippell's figure certainly represents the smoother 

 species, rather than that called T. crenata by Dana, which latter, 

 however, may not improbably be the T. crenata of Milne Edwards, 



