CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 57 



are broad, very slightly projecting; the posterior two angular with 

 their posterior sides six times as long as their anterior sides. Front 

 of moderate width; the interorbital breadth being more than half 

 the width of the carapax. Surface of chelopoda minutely rugulose. 

 Pincers black ; the black color of the thumb not extending on to the 

 hand ; teeth of inner margins strong. /\mbulatory feet as in the 

 typical variety of C. exaratus, but less hairy. The abdomen is also 

 as in the last mentioned species. 



Color light reddish. Dimensions of a male : Length of carapax, 

 0.43 ; breadth, 0.65 inch. 



The description is taken from a Chinese specimen. Those from 

 the Japanese islands agree more exactly with Dana's description, 

 and a comparison with the original specimens shows them to be the 

 same. 



This may finally prove to be a smooth variety of C. exaratus. 

 The specimens all show a system of rugosities upon the chelopoda 

 of the same kind as in that species, although so nearly obsolete that 

 the surface appears smooth. But the present indications, partic- 

 ularly the want of prominence in the antero-lateral teeth, lead us to 

 consider the form specifically distinct. 



It was taken by us on the coast of China, near Hongkong, under 

 stones on coarse sand, at low- water mark; also at Ousipia and 

 Kikaisima. 



76. CHLORODIUS CAVIPES ' Dana 



Chlurodins cavipcs Dana, U. S. Exploring Expedition, Crust, i, 212, pi. 

 XII, fig. I. 



In some of our specimens the superior crest of the meros in the 

 ambulatory feet is bifurcated near the outer extremity, enclosing an 

 additional small triangular cavity. 



This species approaches Act codes in form, and is one of the con- 

 necting links between the Chlorodinze and the Zozymin?e. It might 

 well be generically separated from a genus containing such forms as 

 C. ungulatus and monticulosus. 



Taken at Port Lloyd, Bonin Islands. 



Genus PILODIUS Dana 



In this genus the outer margin of the orbit is more nearly entire 

 than in any other belonging to the group. 



Lct>todius cavipes Dana. 



