CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 



93 



surface and a space externally at the base of the fingers, which ap- 

 pears as if worn smooth; setae of superior margin very long; lingers 

 somewhat cleflexed, rounded, a little gaping, deeply sulcated within, 

 externally partly granulated. Ambulatory feet, compressed, those 

 of the penuh pair longest ; superior margins of last three joints cili- 

 ated ; meros- joint with a smooth, sharp, thin superior crest. Dactylus 

 of posterior pair short, little more than half as long as that of penult 

 pair, and somewhat curved. Dimensions of carapax : Length, 0.38 ; 

 breadth, 0.6 inch. 



Of this curious species a single specimen only was obtained. It 

 is much broader than other species of the genus, and were it not for 

 its deeply toothed and ciliated antero-lateral margin and its short 

 chelipeds might well be referred to Carcinoplax. 



It was found in the port of Simoda, Japan. 



141. CARCINOPLAX EBURNEA Stimpson 



Carcinoplax cburncus Stimpson, Proc. Acad. Nat. Sci. Phila.. x, p. 94 [40], 

 1858. 



This is a very small species, of which, however, a sufBcient number 

 of examples were taken to illustrate it fully. The carapax is very 

 broad, with a hard, smooth, ivory-like surface. Proportion of length 

 to breadth, i : 1.75. Sides evenly rounded, tumid, with a slightly 

 raised horizontal marginal line or crest, the antero-lateral portion of 

 which is armed with two or three very minute, inconspicuous teeth. 

 Front broad, straight, slightly pointed at the middle. Orbits small, 

 rounded, margins entire. Subhepatic regions swollen. Palate 

 divided by a ridge on either side. Buccal area short, very broad in 

 front and narrowed behind. External maxillipeds nearly as in C. 

 longimana, except that the exognath is broader, wdth a spiniform 

 tooth, and the outer margin of the endognath is deeply concave; the 

 meros is much broader than the ischium and much produced at its 

 external apex or auricle ; finally the palpus is rather endarthroid than 

 goniarthroid. Chelipeds long and slender, with glossy surface ; meros 

 slightly hairy on the edges ; carpus small ; hand elongated with a 

 smoothly-rounded and somewhat swollen palm ; fingers slender, as 

 long as the palm, sharply dentated within, teeth small, tips hooked, 

 crossing each other. Ambulatory feet slender, w'ith hairy edges. 

 Abdomen of the male triangular, median segments soldered, margin 

 toothed at base. Abdomen of the female triangular. 



The color in life is pale brownish or yellowish ; three diverging 

 white streaks on the posterior part of the carapax; chelipeds darker; 



