56 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



PORTUNUS (PORTUNUS) ACUMINATUS (Stimpson) 



Plate 19 



Achelous acuminatus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 1871, 

 p. 112 [22] (t.ype-locality, Panama; type not extant) ; not Portunus (Portunus) 

 acuminatus Rathbun, Proc. U. S. Nat. Mus., vol. 38, 1910, pp. 538 and 

 577, pi. 49, fig. 4. 



Neptunus acuminatus A. Milne Edwards, Crust. R6g. Max., 1879, p. 219 

 (after Stimpson). 



Diagnosis. — Lateral spine nearly two-thirds as long as the antero- 

 lateral margin. Cheliped 2)2 times as long as carapace. Superior 

 spine of manus at distal fifth in male. 



Description. — Carapace 2}^ times as broad as long. The sinuous 

 branchial ridge bends gradually forward and inward from the base of 

 the lateral spine. The median pair of teeth are subtriangular, the 

 outer pair less so. Of the lateral teeth only the second and sixth 

 teeth show any reduction ; the lateral spine is very long, as long as the 

 width of the next five teeth, its carina nearly transverse, bent a little 

 forward. Chelipeds of moderate length, 2}^ times as long as carapace; 

 the spine of the carapace nearly reaches the terminal spine of the arm. 

 Spines on inner margin of arm 4 right, 5 left. Inner spine of wrist 

 subequal to proximal spine of palm; subterminal spine of palm at 

 distal fifth of upper margin. Sternum and- abdomen of male rela- 

 tively smooth and polished, terminal segment of abdomen a little 

 over two-thirds as long as sixth segment. 



Measurements. — Male (40270), total length of carapace 26.7, 

 width of same 65.4, width to anterior base of lateral spines 44.3, 

 fronto-orbital width 20.8, width of front 6.5 mm. 



Range. — Known only from Panama. 



Material examme(^.— Panama Bay; lat. 8° 38' 00" N., long. 79° 

 31/ 30" W., 16 fathoms; gn. M.; March 30, 1888; station 2802, 

 Albatross; 1 male (40270). 



Remarlis. — Stimpson's type was a young male only half an inch 

 (about 13 mm.) long; the lateral spine of the carapace was as long 

 as or even longer than in the large specimen described above, "nearly 

 two-thirds as long as the antero-lateral margin." The second, 

 fourth, and sixth teeth were somewhat smaller than the others. 

 The frontal teeth were equal; this is not true of our specimen, which 

 though larger is not mature. 



PORTUNUS (PORTUNUS) ASPER (A. Milne Edwards), new combination 



Plate 20, Figures 2 and 3; Plate 21; Plate 22, Figures 1 and 2 



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

 1861, p. 325, pi. 30, figs. 3-3c, male (type-locality. Chili; types in Paris 

 Mus.); not Neptunus xantusii A. Milne Edwards, 1879. 



Achelous transversus Stimpson, Ann. Lye. Nat. Hist. New York, vol. 10, 1871, 

 p. Ill [21] (type-locality, Manzanillo, Mexico; type not extant). 



