174 Bulletin, Vanderhilt Marine Museum, Vol. II 



The natatory legs have the four proximal joints stocky, the merus 

 armed at its inner and outer distal angles each with a spine ; the pro- 

 podus laminate, widening distally, the dactyl oval, fringed with setae. 

 Dr. Verrill states that the Bermuda specimens have the merus of the 

 swimming legs armed with five or six small, acute spinules on the 

 posterior lateral margin. 



Synonymy. — Lupa gihhesii Stimpson, Ann. Lye. Nat. Hist. N. Y., vol. 

 7, p. 57, 1862. 



Achelous gihhesii Stimpson, op. cit., p. 22, 1860. — S. I. Smith, Ann. 

 Kept. U. S. Comm. Fish and Fisheries for 1882, p. 349, issued 

 1884. — Smith, op. cit., for 1885, p. 30, issued 1886. — Kingsley, 

 Proc. Phila. Acad. Nat. Sci. for 1879, p. 398.— A. E. Verrill, 

 Trans. Conn. Acad. Arts and Sci., vol. 13, p. 389, 1908. 



Neptunus gihhesii A. M. Edwards, Arch. Mus. d'Hist. Nat. Paris, vol. 



10, p. 326, pi. 31, fig. 1, la, lb, 1861.— Miss. Sci. Mex. et Amer. 



Centrale, p. 213, 1879. 

 Portunus (Achelous) gihhesii M. J. Rathbun, Amer. Nat., vol. 34, p. 



140, 1900; Bull. U. S. Fish. Comm., vol. 20, pt. 2, p. 140, 1901. 



Portunus (Achelous) ordwayi Stimpson. 



Plate 58, fig. B. 



Name: Professor Stimpson named this species in honor of Albert 

 Ordway, who as a student of Dr. Louis Agassiz, wrote an import- 

 ant monograph of the genus Callinectes (Journ. Boston Soc. Nat. 

 Hist., vol. 7, p. 567). This species is also known as the "silvery 

 clawed crab" because of the iridescent, silvery area on the outer face 

 of the claw. 



Diagnostic characters: A smooth, iridescent, silvery area on the 

 outer surface of the cheliped. A curious mask-like figure on the me- 

 dian part of the carapace, formed by the areolations. 



Type : The type material came from Florida and St. Thomas. 



Distribution : Known from Cape Hatteras, N. C, southward in the 

 Gulf Stream, throughout the Bermudas and West Indies to Bahia, 

 Brazil. Pelagic. 



Color: According to Dr. A. E. Verrill: "Specimens with the cara- 

 pace 32 to 38 mm. long, taken April, 1901, in Castle Harbor, were in 



