CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 59 



somewhat distantly arranged in longitudinal rows ; fingers sulcate, 

 the ridges tuberculated at base. The exposed upper surfaces of the 

 ambulatory feet are granulose and thickly pubescent. 



Colors : The upper surface is variegated with purple-brown and 

 buff. Fingers reddish-brown. Hand in the male a broad encircling 

 band of brown near the bases of the fingers. Dimensions of a male : 

 Length of carapax, 0.29 ; breadth, 0.44 inch. Of a female : Length,. 

 0.33 ; breadth, 0.5 inch. 



This species differs from P. pubescens in the broader abdomen 

 of the male, the extremity of which is bluntly rounded. From P. 

 pilumnoides it differs in the absence of denticulation at the superior 

 edge of the meros joint of the feet. 



Found on madrepores, drawn up from a depth of i or 2 fathoms,, 

 in a bay on the outer side of Hongkong Island. 



Genus CYMO De Haan 



The crabs of this genus are easily recognized by their depressed,, 

 suborbicular form and rough, hairy surface, which is almost always 

 obscured by sordes. They have some affinity to the Trapezics in 

 general appearance and in their habits. The two known species are 

 always found together, and are common on coral everywhere in the 

 warmer latitudes of the Pacific Ocean. 



79. CYMO MELANODACTYLUS De Haan 



Cymo mclanodactyliis De Haan, Fauna Japonica, Crust., p. 22 (no 

 descr.). Dana, U. S. Expl. Exped., Crust., i, 225, pi. xiii, fig. i. 



This species is of a dirty buff color, the eyes purplish-brown, the 

 fingers black. 



The characters of the front, etc., mentioned by authors as distin- 

 guishing this species from C. andrcossyi are unreliable on account 

 of their variation. In fact, it would seem impossible to separate the 

 two species from characters derived from the carapax alone. The 

 chelopoda, however, afford some good distinctive marks. In C. 

 melanodactyliis the granules of the outer surface of the hand are 

 arranged in longitudinal rows, those of the middle row and of a row 

 near the upper edge being larger than the others ; those of the rows 

 near the upper edge subspiniform and sharp. There are generally 

 numerous red granules on the upper surface of the hand, but none 

 on tlie outer surface, as in C. andreossyi. The fingers are black, 

 with the basal half strongly granulated. 



Found on madrepores hooked up in a bay on the east side of 

 Hongkong Island ; also at the Bonin Islands. Dana reports it 

 from the Fijis. 



