200 • PROCEEDINGS OF THE ACADEMY OP [1880. 



Carapax depressed, shining, witli transverse plicae, oblique on 

 the branchial region. Sides generally slightly arcuate, with one 

 tooth behind the orbital angle. Frontal lobes prominent, front 

 sinuate. Meros of chelipeds with transverse rugse, the inner 

 margin dentate ; carpus rugose, with an internal rounded tubercle. 

 Hand minutely granulate, a longitudinal ridge on the lower outer 

 surface, margins rounded; dactylus with the upper margin smooth. 

 Postero-distal angle of the meros of last pair of ambulatory feet 



dentate. 



Florida! {K.. S. Packard; Peab. Acad.; Brown Univ.; H. E. Web- 

 ster, Union College) ; West Indies! (S. G. Morton, H. C. Wood, 

 Jr.); Brazil! (Dr. T. B. Wilson); California! (J. L. Leconte); 

 New Zealand ! (E. Wilson); Tahiti {h.. Garrett); W. Coast Nicar- 

 agua! (J. A. McNiel, Peab. Acad.); Australia (Stm.); Mio Janeiro 

 (Heller); Madeira (Stm.). 



P. gracilis Stimpson ex Saussure. 



Metopograpsus gracilis Saussure, 1. c, p. 443, PI. II, f, 15 (1858) 

 Orapsus guadulpensis Desbonne et Schramm, Crustaces de la Guada- 



loupe, p. 48 (1867). 

 Pachygrapsus gracilis Stimpson, Ann. N. Y. Lye, x, p. 113 (1871). 

 Orapsus {Leptograpsus) rugulosus Martens, Archiv fiir Naturges- 



cliichte, xxxviii, p. 102 (1873). 



Carapax much as in P. transversus, but with no folds on the 

 cardiac region; lateral margins nearly straight, one-toothed. 

 Frontal lobes nearly obsolete ; front nearly horizontal, regularly 

 arcuate and minutely crenulate. Chelipeds and ambulatory feet 

 nearly as in P. transversus, the hand and dactylus, however, being 

 spined or toothed above. 



Florida! {A. S. Packard, Jr., Peab. Acad.); West Indies (Auct.). 



P. corrugatus Kingsley ex Martens. 



Orapsus {Leptograpsus) corrugatus Martens, 1. c, p. 107, PI. IV, f . 8 



(1872;. 



Cuia (Martens). 

 P. aetMopicus Hilgendorf. 



Orapsus {Pachygrapsus) a'thiopicus Hilgendorf, in von der Decken's 

 Reisen in Ost-Afrika, Crust., p. 88, PI. IV, f. 2 (1869). 



Ugurunga, Fast Africa (Hilgendorf). 

 P. plicatus Stimpson ex Milac-Edwards. 



Orapsus plicatus Edwards, Hist. Nat. Crust., ii, p. 89 (1837). 



Orapsus A;rff?<sw Edwards, Ann. Sci, Nat. HI, xx, p. 170 (1853). 



Pachygrapsus plicatus Stimpson, Proc. Acad. Nat. Sci. Phila., p. 102 

 (1858). 



Pachygrapsus striatus A. M.-Edw., Journal Museum Godeflfroy, iv. p. 

 82 (1873). 



