84 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Range. — Known only from the type lot of specimens. 



Material examined. — Off Key West, Florida; lat. 24° 25' 45" N., 

 long. 81° 46' 00" W.; 45 fathoms; coral; temperature 75° F.; Janu- 

 ary 15, 1885; station 2318, Albatross; 1 male holotype, 2 females 

 paratypes (15043). 



PORTUNUS (ACHELOUS) DEPRESSIFRONS (Stimpson) 



Plate 41 



Amphitrite depressifrons Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 

 1859, p. 58 [12] (tjq^e-localities, South Carolina and Florida Keys; types 

 not extant). 



Achelous depressifrons Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, 

 p. 223 [95]. — A. Milne Edwards, Arch. Mus. Hist. Nat., Paris, vol. 10, 

 1861, p. 342; Crust. R6g. Mex., 1879, p. 230, pi. 40, figs. 4 and 4a.— Verrill, 

 Trans. Conneeticut Acad. Arts and Sci., vol. 13, 1908, p. 391, text-fig. 36, 

 pi. 20, fig. 3. 



Neptunus {Achelous) depressifrons Miers, Challenger Rept., Zool., vol. 17, 1886, 

 p. 181. 



Portunus {Achelous) depressifrons Rathbun, Bull. Lab. Nat. Hist. State Univ. 

 Iowa, vol. 4, 1898, p. 276. — Hay and Shore, Bull. Bur. Fisheries, vol. 

 35, 1915-16 (1918), p. 430, pi. 33, fig. 7. 



Diagnosis. — Lateral spine or tooth very little longer than those in 

 front of it. Upper half of outer surface of palm granulate between 

 the carinae. Upper margin of movable finger fringed with hair. 

 Postero-distal margin of merus of swimming legs entire. 



Description. — Size medium, shape suboblong, owing to the great 

 fronto-orbital distance, the small lateral spine and the narrow in- 

 conspicuous front. Pubescence of carapace short and fugitive, 

 granulated lines and patches low. Teeth of front small, triangular, 

 those of inner pair a little the smaller and usually a little more ad- 

 vanced than those of outer pair. Inner tooth of orbit simple, a little 

 behind line of front; fissures ending in V-shaped emarginations ; 

 inner lower tooth broad, well advanced. Antero-lateral teeth sharp- 

 pointed, directed mostly forward, fourth and sixth teeth somewhat 

 reduced, second not uniformly so; ninth or lateral tooth similar to 

 the others in shape and curvature and very little longer. Posterior 

 angles below the granulated marginal line bluntly angled. 



Chelipeds stout, 2]^ times as long as carapace. Merus broad, 

 armed with 5 or 6 spines on inner margin and one small distal spine 

 at end of outer margin; an outstanding fringe of short hair on inner 

 surface below marginal spines. Inner spine of carpus full twice as 

 long as proximal spine of palm; outer spine small. Upper carina of 

 manus strong, reaching nearly to finger and ending in a large ascend- 

 ing spine; a smaller spine at extremity of margin; a fringe of hair 

 projects downward from the inner lower edge of the carina. A 

 strong ridge through the middle of the palm forms an oblong upper 



