CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 4I 



Orbits of moderate size ; internal hiatus large. Surface of hec- 

 tognathopoda smooth ; inner margins thickly setose. Chelopoda un- 

 equal, the right being the larger ; meros spinulose above ; carpus with 

 a glossy but somewhat uneven surface, and with two teeth at the 

 inner angle, the upper one largest. Outer surface of hand with two 

 or three longitudinal sulci, deepest in the smaller hand ; ridges be- 

 tween the sulci transversely rugose. Ambulatory feet compressed ; 

 meros very slightly setose, with a singk row of small spines along 

 the superior crest and spinulose on the inferior edges ; penultimate 

 joint with two rows of spines above, beneath which there is a shallow 

 excavation; last three joints setose with long yellow hairs. 



Color reddish-white or orange in preserved specimens. Dimen- 

 sions of carapax: Length, 1.04; breadth, 1.55. 



This species is respectfully dedicated to Capt. John Rodgers, the 

 commander of the expedition, to whose interest and zeal in forward- 

 ing the researches of the scientific corps the extent and value of the 

 collections are in a great measure due. 



It was taken on Bowers Shoal, in Caspar Straits, during the sur- 

 vey prosecuted by Captain Rodgers in the steamer "John Hancock." 



Genus ATERGATIS De Haan 



52. ATERGATIS FLORIDUS ' (Linnaeus) De Haan 



Cancer Aoridus Linn.^us. 



Cancer ocyroe Milne Edwards, Hist. Nat. des Crust., i, z~^. 

 Afergatis Unridus De Haan, Fauna Japonica, Crust., p. 46. Daxa, U. S. 

 E.xploring Expedition, Crust., i, 159, pi. vii, fig. 4. 



Living .specimens are of a dark yellowish-brown color above, with 

 reticulating cream-colored blotches. Below \\hite, tinged with 

 cream color, and a little brownish in parts. E.\es leaden-blue, glossy. 

 Fingers of a dark mahogan\- color. 



Taken by the expedition at Loo Choo, among corals on the outer 

 reefs, near low-water mark ; also in Caspar Straits. 



The species also inhabits the seas of southern Ja])an and China 

 ( Dc IlaanLand the Paumotu. Society, Friendly, and Fiji groups of 

 islands (Dana). 



\-ltcrgatis ocyroe (ITcrl)st). 



