CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION 87 



CORYSTOIDEA 



Genus TRICHOCERA De Haan 



133. TRICHOCERA GIBBOSULA ' De Haan 



Trichoccra gibbosula De Haan, Fauna Japonica, Crust., p. 45, pi. 11. fig. 4, 

 pi. xiii, fig. 3. 



Our single specimen is small, about one-third of an inch in length. 

 The rostrum is more projecting and the protuberances of the dorsal 

 surface of the carapax much sharper than is represented in De 

 Haan's figures. There is little doubt, however, that it is only the 

 young of the species above cited. 



Dredged from a sand}- bottom, in 30 fathoms, off the northeast 

 coast of Niphon. 



Genus KRAUSSIA Dana 



134. KRAUSSIA NITIDA Stimpson 



Plate X, Fig. 4 

 Kraiissia iiitida Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 40 [37], 185S. 



Carapax suborbicular ; proportion of length to breadth, 1:1.12. 

 Upper surface glossy and nearly smooth : obsoletely crenulate-lineo- 

 late. Interantennal front much projecting, divided into two lobes 

 by a deep median emargination or fissure ; each lobe is also nearly 

 divided in two by an excavation of less depth. -Margins of front 

 ciliated. Superior margin of orbit with a deep fissure near the 

 inner side. There are five short longitudinal impressed lines i>n the 

 anterior part of the carapax, terminating in the fissures of the front 

 and orbits. Antero-lateral margin ciliated, smooth in appearance, 

 but minute!}' crenulated, and \\ith three or four inconspicuous emar- 

 ginations indicating the normal teeth. Postero-lateral margin very 

 short and concave. Chelopoda nearl\' smooth ; hand above obso- 

 letely lineolated ; dactylus with longitudinal ridges above, somewhat 

 crenulated near the base ; a minute spine on the front of the carpus 

 and one near the summit of the meros-joint. Posterior feet with 

 long hairs on their margins. 



Color in life white ; carapax sometimes cream-colored, and often 

 streaked with flesh color. Pincers brown. Dimensions of a male: 

 Length of carapax, 0.32 ; breadth, 0.36 inch. 



^ Cancer gibbosiihis (l)c Haan). 



