Crustacea on the coast of JVew England. 



259 



different localities would show a complete gradation between the 

 extremes of coloration. 



The following table of measurements shows the variation in the 

 proportions of the cara])ax due to age, and the complete correspond- 

 ence in the proportions of specimens of similar size from Bermuda 

 and Key West, on the one hand, and Lower California and Peru, on 

 the other. In order to show more clearly the relative proportions of 

 the carapax, the measurements in the last three divisions of the table 

 are given iirst in millimeters and then in the unit of the length of 

 the carapax. In regard to the height of the front, which is not given 

 in the table, it may be mentioned that it is absolutely higher in the 

 largest specimen from the Bermudas than in either of the specimens 

 from La Paz. 



a, Provincetown, Mass. b, Brazil (C. P. Hartt). c, Bermuda (G. Brown Goode). 

 d, Key West, Fla. (received from Dr. Harrison Allen), e, La Paz, Lower California (J. 

 Pedersen). / Callao, Peru (P. H. Bradley). 



The geographical distribution of the species is, perhaps, sufficiently 

 indicated by the localities given above in the synonymy. 



Pachygrapsus transversus stimpson. 



Grapsus traiisversus Gibbes, Proc. Amer. Assoc. Adv. Sci., 3d meeting, p. 181 (17), 



1850 (Florida ; said to belong to " Pachyr/rapsus if that be adopted.") 

 Pachygrapsus transversus Stimpson, Ann. Lye. Nat. Hist. New York, vii, p. 64 (18), 



1859; Amer. Jour. Sci., II, xxvii, p. 446, 1859; Ann. Lye. Nat. Hist. New 



York, X, p. 113, 1871. 

 Smith, Report Peabody Acad. Sci. Salem, 1869, p. 91, 1871 (Pacific coast Central 



America). 

 Trans. Conn. Acad.. Vol. IV. 34 May, 1880. 



