Boone, Crustacea, Cruises of ''Eagle" and " Ara," 1921-28 179 



dian tooth. The fingers are slender, not quite as long as the palm, 

 tapering, grooved, the upper right with a huge, sub-basal molar tooth, 

 the remaining teeth being a large, triangulate tooth alternated by two 

 smaller triangulate teeth, the edges interfitting. 



The ambulatories are slender; the dactyli each about one-fifth 

 longer than the related propodi, grooved ; the propodi are also grooved 

 on the outer faces. 



The natatory legs are stocky, the basis is produced into an acute 

 spine at the anterior distal angle; the merus is stocky, with two or 

 three spinules across the distal margin and one spine at the posterior 

 distal angle ; the dactyl is oval. 



Synonymy. — Cancer marinus scutiformis Seba, Museum, T. Ill, pi. 

 20, fig. 9; figured by Latreille under the name Portunus san- 

 guinolentus dans I'Encyc. Meth., pi. 272, fig. 6. 



Lupea sedae H. Milne Edwards, Hist. Nat. Crust., I, p. 455, 1834. 



Neptunus sehae A. Milne Edwards, Arch. Mus. Hist. Nat, Paris, Tome 



X, p. 329, pi. 28, fig. 2, 1861; Miss. Sci. Mex. et dans I'Amerique 



Centrale, part 5, tome I, p. 216, 1879-1880. 



Achelous sehae S. I. Smith, Trans. Conn. Acad. Arts and Sci., vol. 2, 

 p. 34, 1869.— Verrill, ihid., vol. 13, p. 380, fig. 27, 1908. 



Portunus sehae Rathbun, Amer. Nat., vol. 34, p. 142, 1900. 



Portunus (Achelous) sehae Rathbun, Bull. U. S. Fish. Comm., vol. 20, 

 part 2, p. 46, 1901.^ 



Portunus (Achelous) spinimanus Latreille. 



Plate 61. 



Diagnostic characters : Frontal teeth, including the bilobed orbi- 

 tal teeth, eight, the four frontal teeth being decidedly more prominent 

 than the bilobed orbital teeth. Carapace oval, lateral spine weak, 

 transverse areolations very prominent. Natatory legs with the pos- 

 terior distal end of the merus angled and armed with a spine and a 

 row of denticles. 



Type: Latreille 's type came from the Cayenne, also from Brazil 

 and is deposited in the Paris Museum. 



Distribution: Pelagic from the Virginia coasts southward in the 

 course of the Gulf Stream to the West Indies, the Bermudas, the Gulf 

 of Mexico and southward as far as Rio de Janeiro, Brazil. 



