THE CANCROID CRABS OF AMERICA 71 



Tagus Cove; 12 fathoms; 1899; 1 young (Stanford Univ.). 



Off Hood Island; lat. 1° 21' 30" S., long. 89° 39' 45" W.; 20 

 fathoms; co. S. ; April 7, 1888; station 2812, Albatross; 1 female 

 holotype (21587). 



PORTUNUS (ACHELOUS) ORDWAYI (Stimpson) 



Plate 33 



Achelous ordwayi Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 224 



[96] (type-localities, Key Biscayne and Tortugas, Florida, and St. Thomas; 



types not extant). 

 Neptunus cruentatus A. Milne Edwards, Arch. Mus. Hist. Nat., Paris, vol. 10, 



1861, p. 326, pi. 31, figs. 2, 2a (type-locality, Antilles; type in Paris Mus.). 

 Neptunus ordwayi A. Milne Edwards, Arch. Mus. Hist. Nat., Paris, vol. 10, 



1861, p. 430; Crust. R6g. Mex., 1879, p. 217, pi. 40, figs. 2-26. 

 Poriunus aurimanus Forns in Gundlach and Torralbas, An. Acad. Cien. Habana, 



vol. 37, 1900, p. 63 (type-locality, Cuba; type in Acad. Cien. Habana). 

 Portunus (Achelous) ordwayi Rathbun, Bull. U. S. Fish Comm. for 1900, vol. 2, 



1901, p. 46. 



Diagnosis. — Chelipeds fringed with hair above. Upper outer sur- 

 face of palm smooth, iridescent. Postero-distal margin of merus of 

 swimming legs spinulous. Lateral spine of carapace in male twice as 

 long as adjacent tooth. 



Description. — Carapace narrow, covered with a short pubescence, 

 and with granulation on raised portions and near lateral and anterior 

 borders. Front prominent, the four teeth similar, narrow, subtri- 

 angular, acute or nearly so, the inner pair distinctly more advanced 

 than outer pair. Inner orbital tooth with a sharp spiniform tip, sep- 

 arated from the front by a mde and very deep sinus, and having a 

 slight hump but not an accessory denticle on its outer margin. Orbits 

 and eyes large. Antero-lateral teeth a little longer than wide, spine- 

 pointed, the first six directed forward, the others obliquely outward. 

 Lateral spine narrow, curved forward, length in adults twice or a little 

 more than twice as long as the adjacent tooth. Postero-lateral border 

 near the spine almost transverse. Epistomial spine not developed. 



Chelipeds short, a little more than twice as long as carapace, merus 

 and manus both enlarged at middle; a small curved spine at distal 

 end of outer margin of merus and a row of four spines on inner margin. 

 The carpus is armed outside mth a very small spine, and inside with 

 a long spine reaching halfway to the manus spine, which is at the 

 distal third (in the largest) or foyrth of the upper margin or the widest 

 part of the hand. The upper half of the outer face of the palm is 

 smooth, shining and iridescent, widest at its middle. Inner margin 

 of merus, distal margin of carpus and upper margin of manus and 

 dactylus with a fringe of long hair. Merus of swimming legs a little 

 longer than wide, its postero-distal margin spinulous. 



