CRUSTACEA NORTH PACIFIC EXPLORIXG EXPEDITION I99 



mostly smooth and glabrous, except toward their edges and extrem- 

 ities, where they are sharp-granulated or short-spinulose. The 

 larger hand is thus granulated, the granules being very small, with 

 sharp black apices ; they are numerous above and on the fingers, but 

 sparsely distributed on the outer surface. The dactyli of the ambu- 

 latory feet are spinulose and liairy ; those of the right side are some- 

 what flattened, but not angular. In the third foot of the left side 

 the carpal joint is produced at the inferior angle; and the last two 

 joints are depressed externally, but not flat, and have a smooth 

 punctate surface ; the dactylus is convex and spinulose within. The 

 processes from the coxaj of the fifth pair of feet in the male are very 

 much produced, that on the right one being longest and e(|ualing in 

 length the fourth pair of feet. 



This species is of a deep purple color, inclining to blue, rarely dark 

 olive. The posterior part of the carapax is lighter, with four longi- 

 tudinal mahogany-colored stripes, the two inner ones forming" a lyre- 

 shaped mark. Teeth of the inner surfaces of the fingers white. 

 Length of the animal, 4 inches; length of the carapax, 1.5; of the 

 gastric or anterior region, 0.96; breadth of the front. 0.31 ; greatest 

 breadth, across branchial regions, 0.87 inch. 



It differs from C. pcrlata, as figured by Alilne Edwards in the 

 illustrations to the "Regne Animal," and as described by De Haan, 

 in the smooth external surface of the last two joints of the third foot 

 on the left side, and in its more hairy feet. The apex of the left- 

 hand male organ, or coxal process of the last pair of feet, is scarcely 

 truncated, as described by De Haan for C. perlata, but is deeply ex- 

 cised on the outer side of the apex, as if a square piece had been 

 cut out. 



Found in considerable numbers at the Bonin Islands, on the sides 

 of the hills surrounding Port Llo\d. It was ahso taken at the Ama- 

 kirrima Islands by Mr. Squires. 



310. CENOBITA RUGOSA Milne Edwards 



Cciidbitti rugosa Mii.xr, Kdwards, Hist. Nat. des Crust.. 11, 241. DeIIaan. 



I'aiina Jap., Crust., p. 2i_'. Da.na, L'. S. l-'x])!. I*..\i)i>(i.. Crust., 1. 471, 



pi. .\.\.\, tig. I. 

 Ccnobita clyfcuta ()\vi:n, Zool of Bocdicy's Voy., p. 85, pi. x.w. tiij. i. 



( )f an olive color in life, .\nterior ])art of carapax with four 

 brownish spots. A longitudinal median line of bnnvn on the second 

 joint in each foot. The front of the larger hand and the outer siu'- 

 face of the third foot of the left side are pale red. 



Taken 1)\- us at the I'.onin Islands and at Tahiti. 



