CRUSTACEA NORTH PACIFIC EXPLORING EXPEDITION I23 



Plagusia orientalis Stimpson, Proc. Acad. Nat. Sci. Phila., x, p. 103 [49], 

 1858. 



In this species the superior lobe of the ischium iu the secoud and 

 third pairs of walking feet is prominent and dentiform, but never 

 denticulated — at least not in any of the specimens which we have 

 seen. 



The name /'. tiibcrciilata was applied by Lamarck by mistake to a 

 specimen in which the pubescence had been rubbed off the carapax. 

 This specimen may have belonged to this species, but in the uncer- 

 tainty we have thought best to apply a new name. 



The species was found by us at the Hawaiian Islands and on the 

 outer shores of Hongkong. 



203. PLAGUSIA DEPRESSA' (Fabricius) Latreille 



Cancer dcprcssus Fabricius, Suppl., 343. Herbst, Naturg. d. Krabben u. 



Krebse, i, 117, pi. iii, iig. 35. 

 Grapsits depressus Latreille, Hist. Crust, et Ins., vi, 66. 

 Plagusia immaciilata Lamarck, An. s. vert., v, 247. 

 Plagusia depressa Latreille, Encyc. Meth., x, 147. Milne Edwards, 



Hist. Nat. des Crust., 11, 93; Mel. Carcin., p. 145. Dana, U. S. Expl. 



Exped., Crust., i, 369. 

 Pliilyra depressa De Haan, Fauna Jap., Crust., 31. 



This species in life is elegantly variegated with crimson and yel- 

 lowish. Specimens from Hongkong and Loo Choo are much 

 smoother than others. Besides these localities, it was found by Mr. 

 Squires, of the "Hancock," abundantly in Caspar Strait, some- 

 times "attached to floating wood," and by Lieut. Van Wycke, of the 

 "Porpoise," at Tomboro, or New Ireland. 



Genus ACAXTHOPUS De Haan 

 204. ACANTHOPUS PLANISSIMUS' (Herbst) Dana 



Cancer planissimns Herbst, Naturg. d. Krabben u. Krebse, in, 3, pi. lix, 



fig- 3- 

 Plagusia clavimana Desmarest, Milne Edwards, et al. 

 Acanthopiis clavimanus De Haan, Fauna Jap., Crust., p. 30. 

 Acanthopus planissimns Dana, U. S. Expl. Exped., Crust., i, 2,72- Milne 



Edwards, Mel. Carcin., p. 146. 



The following are the life colors of a specimen from Port Lloyd, 

 found by Mr. Kern : Carapax above bright red, inclining to orange, 

 with median bluish-white line, from which two bluish-white patches 



^ ? Plagusia tuberculata Lamarck. 

 ' Percnon planissimuin (Herbst). 



