264 CRABS OF THE FAMILY PERICERIDA—RATHBUN. 
movable joint, forms part of a row of six teeth ending at the subhepa- 
tic region. There are several irregular rows of tubercles beneath the 
lateral teeth of the carapace. 
Chelipeds slightly longer than the first pair of ambulatory legs. 
Merus with spinous margins, a ridge of strong spines above, and tuber- 
cles on the inner and outer faces. Carpus covered with tubercles, 
some of which are spiny. Hands smooth, upper and lower margins 
nearly parallel. Fingers finely dentate, showing when closed only a 
slight hiatus at the base. 
Ambulatory legs pubescent, with the meral and carpal joints flattened 
above, both margins of the upper faces with strong spines. Lower 
margins with a few small spines. Propodal joints with a few weak 
spines above. . 
Length, from base of horns, 15.5 millimeters; width, exclusive of 
spines, 13.5 millimeters; proportion, 1: .871. 
Indian Key, Fla.; H. Hemphill, 1885 (15823); one immature female. 
A somewhat worn specimen of a male not differing essentially from 
the above description was collected at Rio Formoso, Pernambuco, Bra- 
zil, by R. Rathbun, 1875-1877. 
Mithrax aculeatus (Herbst). 
Cancer aculeatus Herbst, Natur. der Krabben und Krebse, 1, p. 248, pl. x1x, fig. 104, 
1782. 
Mithrax aculeatus Milne Edwards, Mag. de Zool., 11, 1852; Hist. Nat. des Crust., I, p. 
321, 1834; (Atlas du Régne Animal de Cuvier, pl. 27, fig. 1). White, Cat. Brit. 
Mus. Crust., p. 6, 1847. Stimpson, Amer. Jour. Sci., XXIx, p. 132, 1860; Ann. 
Lye. Nat. Hist. N. Y., vir, p. 188, 1860. (Desbonne and Schramm, Crust. de la 
Guadeloupe, p. 5, 1867.) Martens, Arch. fiir Natur., xxxvill, p. 81, 1872. A. 
Milne Edwards, Miss. Sci. au Mexique, pt. 5, 1, p. 102, 1875. Miers, Challenger 
Rept., Zool., Xvit, p. 86, 1886. Aurivillius, K. Sv. Vet.-Akad. Hand.. Bd. 23,1, p. 
56, 1889. 
There are no specimens of large size in the collection. In individuals 
one and a half inches long the rostrum is no longer than in specimens 
of verrucosus of the same size. 
RECORD OF SPECIMENS EXAMINED. 
Florida: 
Indian Key (14081), Nights Key (14073), Big Pine Key (14030); H. Hemphill. 
Key West; H. Hemphill (13820), (Union College Coll.). Key West Harbor; 
Dr. E. Palmer (15810). 
Bahamas: 
Andros Island, young, fragmentary (Stearns Coll.); Abaco, U. 8. Fish Com- 
mission, 1886 (16301). 
Jamaica; T. H. Morgan, 1891. 
St. Thomas, U. 8. Fish Commission, 1884 (16191). 
San Domingo; W. M. Gabb, 1878 (4171). 
Fernando de Noronha, Brazil; R. Rathbun, 1875-77. 
This species has also been recorded from Vera Cruz. 
