CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 219 



peduncle of the anteniKe ; peduncles rather stout; cornea scarcely 

 dilated. Acicle long, hairy, and reaching beyond the eyes. On the 

 margin of the second sternal segment, between the bases of the outer 

 maxillipeds, there are two sharp teeth or spines. The right cheliped 

 is very large, reaching much beyond the extremities of the ambu- 

 latory feet; ischium-joint with a long, sharp spine at the inner apex; 

 carpus a little longer than broad at its anterior extremity and some- 

 what longer than the palm of the hand ; hand flattened above ; fingers 

 shorter than the palm and ornamented above, along their inner mar- 

 gins, with a closely set series of tufts of setae directed inward. There 

 is a deep notch in the outline of the hand at the outer base of the 

 dactylus. The left cheliped is about one-half as wide as the right, 

 and reaches beyond the base of the right dactylus. In the armature 

 of the surface the chelipeds are much alike ; the surface of the 

 meros-joint is unarmed, but sparsely clothed with short series of 

 hairs arising from slight transverse squamiform ridges ; the anterior 

 margin of the meros is armed above with comb-like teeth, three in 

 the left, six in the right cheliped ; carpus and hand spinous and 

 densely covered with pubescence arising to the tips of the spines. 

 These spines cover the whole upper surface of the carpus ; they are 

 strong, sharp, about 1/15 inch in length in adult specimens. On the 

 right hand they form a median and two marginal rows ; on the left 

 hand one median row continued on the immovable finger, one row 

 on the outer margin, and a few scattered at the inner base. Between 

 the spines there are small setiferous tubercles. 



The ambulatory feet are slender, sparsely hairy in transverse 

 fascicles, and armed with one or two spines on the superior edge of 

 the carpus ; dactyli long and slender, longer than the penult joint, 

 not twisted, and sparsely armed with short, stifl:' hairs ; terminal un- 

 guiculi very short. Dactylus of the right ambulatory foot of the 

 first pair longer than the carpus of the right cheliped. Feet of the 

 fourth pair very broad, compressed, long-ciliated above ; dactylus 

 very short, scarcely overreaching the tip of the process of the penult 

 joint or hand. Color orange, minutely mottled on the body ; feet 

 barred above with dark red. Length, about 3.6 ; length of carapax. 

 0.8; breadth of front (between bases of outer antennae). 0.4: length 

 of great cheliped. 2.3 inches. 



This species, contrary to the usual practice among hermit crabs, 

 never leaves the habitation (a small shell) it has first selected. In 

 the enlargement of its domicile (carcina-cium ) to suit its own 

 growth, it is assisted by a little architect, a hydroid polyp (Hydrac- 

 tinia sodalis Stm.). about half an inch in length, which in consider- 



