198 SMITHSONIAN MISCELLANEOUS COLLECTIONS 



dilatation of the last two joints of the external maxillipeds. The 

 abdomen, as described for H. mertensii, is in some points different 

 from that of H. dentatus and H. cavicauda, in which two species it is 

 more nearly as described for Dermaturiis. Although the greater 

 part of the abdomen in the male is soft and coriaceous, yet the seg- 

 ments can be traced, and each segment is indicated by a small, round, 

 indurated piece on each side. The female abdomen is unsymmetri- 

 cal, as in Lithodes, with its segments on the left side a little indu- 

 rated, corneous, and smooth. 



This genus is peculiar to the Northern Pacific Ocean. 



308. HAPALOGASTER DENTATA ' (De Haan) Stimpson 



Lomis dentata De Haan, Fauna Japonica, Crust., 219, pi. xlviii, fig. 2. 

 Hapalogaster dcntaia Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 245 

 [83], 1858. 



The flat lanceolate acicle or movable scale of the external antennae 

 is regarded as a spine in De Haan's description. The median frontal 

 tooth is subspiniform in the adult, but broader and blunter in the 

 young. The color in life is dark reddish brown. 



It is extremely abundant on the shores of Hakodadi Bay, Island 

 of Jesso, inhabiting weedy and stony shores just above low- water 

 mark. It also occurs at Simoda. 



PAGURIDEA 



Genus CENOBITA Latreille 



309. CENOBITA PURPUREA Stimpson 



Cenobita purpurea Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 245 [83], 

 1858. 



Carapax convex, strongly swollen or tumid just behind the front, 

 which is contracted. The surface of the anterior or gastric region 

 is sparsely granulated anteriorly ; posteriorly the granules become 

 more numerous, sharp, and setigerous. " Branchial regions not much 

 projecting, their lateral margins nearly straight. Eyes much pro- 

 jecting, minutely granulated above, and with the apex sharply pro- 

 jecting, forming a right angle. Ophthalmic scales sharp, not 

 denticulated. Feet moderately hairy on the edges, and thickly hairy 

 below toward their extremities. The upper surfaces of the feet are 



^ Lomis dentata De Haan. 



