1880.] NATURAL SCIENCES OF PHILADELPHIA. 211 



P. excelsus Heller. 



Perigrapsus excelsus Heller, Verb. Zool. Bot. Ges. Wien, 1862, p. 522. 



Novara Crust., p. 50, PI. V, f. 1 (1865). 



TaUti (Heller). 



Genus PLATYGRAPSTJS Stimpson, 1858 {Platynotus De Haan, 18.35, preocc). 



Carapax flat. Front horizontal. Sides nearly straight, with 

 two teeth behind the angle of the oi'bit. Meros of the external 

 maxilliped longer than the ischium and bearing the palpus on the 

 external angle. 



P. depressus Stimpson ex De Haan. 



Platynotus depressus De Haau, Fauna Japonica, Crust., p. 63, PI. VIII, 



f. 2 (1835). 

 Platygrapsus depressus et convexiusculus Stimpson, Proc. Acad. Nat. 



Sci. Phila., 1858, p. 104. 



Carapax depressed, smooth; front horizontal , four-lobed , mesial 

 lobes the larger; sides with two teeth behind the angle of the 

 orbit, the posterior tooth indistinct. Chelipeds smooth and 

 unarmed ; meros with the anterior margin acute ; carpus without 

 spines or tubercles ; hand with an elevated line on the lower outer 

 surface ; fingers slender, gaping. Ambulatory feet elongate. 



Japan! (no donor's name); Hong Kong (Heller); LooChoo (Stimpson). 



Tribe Sesarmini (Sub-family /SesarmincB Dana). 



Meros and ischium of the external maxillipecls crossed obliquelj- 

 by a piliferous ridge. 



Genus METASESARMA Edw (1853). 



Carapax quadrate, sides but slightly arcuate, entire ; front 

 broad, deflexed. Sub-orbital lobe large, meeting the front and 

 excluding the antennae from the orbit. Meros of external maxilli- 

 ped greatl}^ elongate, its apex rounded. 



Si/nojjsis of Species. 



Hands smooth, externally and above. roiisseauxi. 



Hand roughened above. granulans. 



Haud roughened above and externally. trapezium. 



M. rousseauxi Edw. 



Metasesarma rousseauxi Edw., Ann, Sci. Nat., Ill, xx, p. 88 (1853). 

 Arch, du Mus., vii, p. 158, PI. X, f. 1 (1854). 



Zanzibar (Edw.). 



