62 Notes on North American Crustacea. 



^cB^^simus palustris. 



Cancer palustris, Sloane ; Ilist. Jamaica. 



Gelasimus vocans, var. A, De Kay ; N. Y. Fauna, Crust., pi. vi., f. 10. 



" « Dana ; U. S. Expl. Exped., Crust, i., p. 318. 



" palustris, M.-Edw. ; Mel. Carcin., 112; pi. iv., f. 13. 



" minax, Le Conte ; Proc. Acad. Nat. Sci., Pliilad., vii. 408. 



The following characters will serve to distinguish the present 

 species from G. pugilator of all ages. The carapax is more 

 narrow^ed posteriorly, and the branchial regions are less inflated. 

 The raised lines of the anterior three-fourths of the lateral mar- 

 gins are more distinctly prominent. The inner side of the 

 greater hand is armed near its postero-inferior angle with an 

 oblique tuberculated ridge ; while the portion corresponding to 

 this ridge in G. pugilator is bluntly rounded. The outer sur- 

 face of the great cheliped is variable in character, the tubercles 

 being very minute or obsolete in some specimens from the 

 Mexican and Central American shores. 



This species lives in marshes, often at considerable distances 

 from the sea, and is never found on muddy or sandy beaches, 

 where G. pugilator abounds. It has a wide geographical range, 

 having been found at Rio Janeiro by Prof Dana, at Aspinwall 

 by the Rev. J. Rowell, at Hay ti by Dr. Weinland, on the coast 

 of Texas by Capt. Pope and Dr. Kennerly, in South Carolina 

 by Dr. Girard, at Old Point Comfort by myself, at the mouth of 

 the Potomac by Mr. Stag, and in New Jersey by Maj. Le Conte 

 and Prof. Baird. 



€rela§iiniu§ pug^ilator. 



Gelasimus pugilator, Bosc. ; Hist, des Crust., i. 198. 

 M.-Edw. ; Mel. Carcin. 113. 

 Le Conte ; Proc. Phil. Acad. vii. 408. 

 " vocans, Gould, (non Rumph). 



Found on sand or mud beaches in creeks and harbors, always 



