64: Notes on North American Crustacea. 



PlagMsia says. 



Plagusia dejjressa, Say ; Jonr, Acad. Nat. Sci. Piiilad., i. 100. 

 " sayi, De Kay ; N. Y. Fauna, Crust., p. 16. 



« M.-Edvv.; Mel. Carcin., 145. 



*' squamosa^ Gibbes; loc. cit. 182. 



This s]>ecies is distinguished from P. sqiiatnosa in having a 

 series of six prominent tubercles ari-anged in the form of an arc 

 across the gastric region. The corresponding tubercles may be 

 traced in P. squamosa, but tliey are neither as prominent, nor 

 so regularly arranged in an arcuated form. Another distin- 

 guishing characteristic may be found in the greater breadth of 

 the superior lobe at the bases of the second and third ambula- 

 tory feet, which is regularly quadridentate. 



The differences pointed out by Milne-Edwards will not serve 

 as characters, since our species is no less tuberculose than P. 

 squamosa. 



Our specimens are from Key Biscayne, Florida. 



Pachygrai^siBs transTersus. 



Grapsus transversus, Gibbes; loc. cit. 181. 

 Leptograpsns rugulosus, M.-Edvv.; Mel. Carcin., 138. (?) 



Scarcely to be distinguished from P. innotatus {Goniograp- 

 sus innotatus, Dana), but the carapax is somewhat more con- 

 vex. The protogastric lobules are suflficiently distinct in full- 

 grown individuals. The " corrugated area on the crest " of the 

 hand, described by Gibbes, is sometimes obsolete. 



Found among the Florida Keys by Wurderaann and White- 

 hurst, and on the coast of Texas by Wurdemann. 



