THE GRAPSOID CRABS OF AMERICA. 337 



a longitudinal series on hand and dactylus. Lobe on basal joints of 

 legs armed above with a spine; anterior margin of meriis joints ir- 

 regularly dentate or spinose. 



Measurements. Male (2476), extreme length of carapace C3.5, 

 width of same 60.5, f ronto-orbital width 39.5 mm. 



Habitat. In the holes excavated by the surf on the rocky coast of 

 Table Bay (Krauss). leather common about the rocks at half tide 

 in Simons Bay (Stimpson). 



Range. Chile (Milne Edwards) : Coquimbo and Island of Juan 

 Fernandez (Porter). Also Cape of Good Hope; New South Wales; 

 Tasmania; New Zealand; Tongatabu. 



Material examined. 



Illawarra, New South Wales, Australia ; U. S. Exploring Exped. ; 

 three specimens (one female) (2379). 



Tasmania: received from Mus. Comp. Zool.; one male (2470). 



Bay of Islands, New Zealand ; U. S. Exploring Exped. ; one male, 

 one female (2360). 



Genus PERCNON Gistel. 



Acanthopus DE HAAN, Fauna Japon., Crust., 1833, p. 5 ; 1835, p. 29 ; type, A. 



ctarimana de Haan, 1835=planissimum (Herbst, 1804). Acanthopus 



preoccupied by Klug, Illig. Mag., vol. 6, 1807, for genus of Hyuienop- 



tera. 

 Percnon GISTEL, Naturg. Thierreichs, 1S48, p. 8; type, P. planissimvm 



(Herbst). 

 Lciolophus MIEKS, Cat. Crust. New Zealand, 1876, p. 4G; type, L. planis- 



simu8 (Herbst). 



Carapace extremely flat and depressed, being quite disk-like. 

 Interantennular septum narrow. Epistome almost linear. Merus 

 of external maxillipeds very small, much narrower than the ischium, 

 and disposed obliquely in repose; exognath extremely short and 

 slender. Chelipeds and legs, though in places spiny, not rugose. 

 Legs much slenderer, and though the meropodites are broad, they 

 are very thin. The appendages of the first segment of the male 

 abdomen end in a claw. 



Distribution. As Plagusia, but not in the Mediterranean. 



PERCNON GIBBESI (Milne Edwards). 



SPRAY CRAB (Jarvis). 

 Plate 103. 



Acanthopus gibbcsi MILNE EDWARDS, Ann. Scl. Nat., ser. 3, Zool., vol. 20, 

 1853, pp. ISO and 14G (type-locality, Antilles; type in Paris Mus.). 



Leiolophus planissimus MIERS, Ann. Mag. Nat. Hist., ser. 5, vol. 1, 1S78, 

 p. 153 (part). Not Cancer planissimus Herbst, 1804. 



Percnon jtlaniitsimum RATHHUN, Proc. U. S. Nat. Mus., vol. 22, 1000, p. 281 

 (part). 



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