218 PROCEEDINGS OF THE ACADEMY OF [1880 



S. sulcata Smith. 



Sesarma sulcata Smith, Trans. Coun. Acad., ii, p. 156 riSTO). 



Corinto, Nicaragua ! i .J. A. McNiel, Peab. Acad. 



S. taeniolata Miers ej; White MS. 



Sesarma tceniolata White MS., Miers, Proc. Zool. Soc., London (1877), 

 p. 137. 



Philippines! (Dr. Wilson, with White's label). 



S. tetragona Milne-E.lwards ex Fab icius. 



Cancer tetragonon Fabriciiis, Suppl. Ent. Syst., p. 341 fl798). 

 Grapautt tetragonon Latr., Hist. Crust, et Ins., vi, p. 71 (1803-4). 

 Sesarma tetragona Edw., Hist. Nat. Crust., ii, p. 73 (1837). 



Zanzibar (Hilgendorfj to New Caledonia (A. M.-Edw.). 



S. trapezoida Milne-Edwards. 



Sesarma trapezoida Edw., Hist. Nat. Crust., ii, p. 74 (1837). 



Locality unJcnown. 

 S. ungulata Milne-EdwarJ?. 



Sesarma ungulata Edw., Ann Sci. Nat. IK, xx, p. 184 (1853). 



Celebes (Edw.). 

 S. vestita Stimpson, 



Sesarma vestita Stimpson, Proc. Acad. Nat. Sci. Phila., 1858, p. 106. 



Japan (Stimpson). 

 S. villosum A. Milne- Edwards. 



Sesarma villosum A. M.-Edw., Bulletin, 1. c, p. 31 (1869). 



Samoan Is. (A. M.-Edw.). 

 S. violacea Herklots. 



Semrma violacea Herklots, op. cit., p. 10, PI. I, f. 9 (1851). 



West Africa! (Du Chaillu). 



Genus ARATTJS M.-Edw., 1853. 



Carapax trapezoidal, elongate, narrow behind, sides straight^ 

 entire ; front deflexed, verj- broad. External maxillipeds as in 

 Sesarma. Ambulatory- feet compressed, the dactyli very short- 



A. pisoni Milne-Edwards. 



Sesarma in»o»{ Edw.. Hist. Crust., ii, p. 76, PI. XVI, f . 4-5 (1837). 

 Ar a tus 2^isoni Fidw., Ann. Sci. Nat., Ill, xx, p. 187, 1853. 



Carapax transversely arcuate, the branchial regions obliquely 

 plicate. Front vertical, its margin two-lobed. Meros of cheli- 

 peds triquetral, the margins denticulate^ the anterior one slightl\- 

 expanded distally. Carpus externally granulate. Hands every- 

 where granulate, the fingers ornamented with pencils of stiff 

 black hairs. 



Florida! (H. E. Webster, Union College); West Indies! (many 



collectors and localities); West Coast of Nicaragua! (J. A. 



McNiel, Peab. Acad); Bio Janeiro (Heller i ; Praya, Brazil 



(Martens). 



