1880.] NATURAL SCIENCES OF PHILADELPHIA. 223 



Sides of carapax acute, the fissures between the teeth being very 

 slight ; all of the border of the carapax finely crenulate. Chelipeds 

 •externally granulate. Carpus produced internally ; the inner sur- 

 face of the hand with a patch of granules on the inner surface. 

 Carpal joints of the ambulator}- feet longitudiually sulcate. 



Bio Janeiro I {Wilkes' Expedition); Bio Grande, Brazil! (Capt. 

 Harrington Peabody Academy). 



C gaimardi Milne Edwards. 



Cydograpsus gaimardi'Ed-w., Hist. Nat. Crust., ii,p. 79 (1837). 



Paragrapsus gaimardi 'Edw., Ann. Sci, Nat. Ill, xx, p. 196 (1853 . 



Australia (Edwards). 

 C, quadridentatus Kingsley <?•»• Milne-EiUvards. 



Paragrapsiis quadridentatus Edw., Ann. Sci. Nat., IH, xx, p 19.") 



(1853). 



Australia (Edw.). 



Sub family Plagusinse Dana.' 



Carapax flattened, antennula? longitudinally plicate, lodged in 

 sinuses of the front, and visible from above. 



Gtnus PLAGUSIA Latr., 18i)(j (restrict). 



Meros of external maxilliped well developed, as broad as the 

 ischium. 

 P. speciosa Dana. 



Cai-apax arcuate, covered everywhere with sqnamiform tubercles, 

 the inter paces being clothed with a short pubescence, these 

 tubercles Ijeing similar iu their arrangement to those of P. depressa 

 Sa}", but much more depressed than in that species. The margins 

 of the inter-antennular portion of the front is simple. Inferior 

 margin of the orbit acute, minutely denticulate. Sides of carapax 

 with two equal acute spiuiform teeth behind the angle of the orbit. 

 Feet closel}- resembling those of P. depressa., the ornamentatio» 

 being similar, but not so prominent. The hands, however, are 

 external!}- marked by six longitudinal impressed lines, the lowest 

 of them being on the inferior margin. The fingers are widely 

 gaping, the extremities deeply excavate. The dentiform process 



1 This sub family having recently been revised by Mr. Miers (Annals and 

 Magazine of Natural Ilistoiy, V, ix, pp. 147-154, February, 1878), and as 

 I agree with his determinations and ideas of specific bmits, I omit the 

 synopsis of species from this paper, merely giving a few notes on the more 

 uncommon forms. 



