268 GRABS OF THE FAMILY PERICERIDA!—RATHBUN,. 
Merus joint of exterior maxillipeds deeply cut at the antero-internal 
angle. 
Basal joint of antenna with a small tooth at the base of the movable 
joint. Spine at external angle, long, more advanced than the preeocu- 
lar spine, ineurved. There is a smaller spine farther back on the mar- 
gin. Remaining joints long with long hairs on the margins. 
There are two subhepatic tubercles, and an irregular longitudinal 
line of four granules on the vertical face of the subbranchial region. 
Chelipeds a little longer than the first pair of ambulatory legs, 
pubescent like the carapace. Upper margin of merus tuberculous. 
Carpus with one or two faint tubercles on the posterior end of the 
upper surface. Manus in the male with upper and lower margins 
almost parallel, slightly contracted near the fingers. There is a small 
tooth at the base of the dactyl. Fingers gaping at base. Ambulatory 
legs with the joints flattened above; margins beset with long hairs. 
Color in alcohol, reddish brown; chelipeds lighter. Fingers pinkish 
red for their proximal half; tips white. 
Length of largest specimen 18.8; greatest width, 16.5; width at post- 
ocular teeth, 11.2 millimeters. 
Found with Mithrax cinctimanus in sponges at Andros Island, Baha- 
mas, by Mr. Frederick Stearns, 1888. 
This species in its shape and antero-lateral teeth most nearly resem- 
bles cinctimanus, but it is more oblong, more convex, and is also readily 
distinguished by the absence of sulci on the branchial regions, and by 
the flattened joints of the ambulatory legs. 
Mithrax cinctimanus (Stimpson). 
Mithraculus cinetimanus Stimpson, Amer. Jour Sci., Xx1x, p. 1382, 1860; Ann. Lye, 
Nat. Hist. N. Y., vit, p. 186, 1860. A. Milne Edwards, Miss. Sci. au Mexique, 
pt. 5, 1, p. 112, pl. xxu11, fig. 3, 1875. Kingsley, Proc. Acad. Nat. Sci. Phila., 
XXXI, p. 389, 1879. Aurivillins, K. Sv. Vet.-Akad. Hand., Bd. 23, 1, p. 59, 1889. 
Mithrax afinis (Desbonne and Scramm, Crust. de la Guadeloupe, p. 10, 1867). 
Mithrax cinctimanus Miers, Challenger Rept., Zool., xv11, p. 87, 1886. 
XECORD OF SPECIMENS EXAMINED: 
Florida: 
Cape Florida (15084), Carysport Reef (18897), Rodriguez Creek (14429), Salt Pond 
Key (14439), Eastern Dry Rocks (14487); Dr. E. Palmer. Harbor Key and 
Plantation Key (Union College Coll.). Key West; H. Hemphill (13830), 
(Union College Coll.), U. 8. Fish Comm. (16194). 
Andros Island, Bahamas (Stearns Coll.). 
Jamaica; T. H. Morgan, 1891. 
St. Thomas and Curacao; U. 8. Fish Comm., 1884 (16195, 16196). 
Found also in the Gulf Mexico. 
Mithrax braziliensis, sp. nov. 
Plate xxxvVI, fig. 2. 
Carapace a little broader than long, ovate, slightly convex, without 
sulci. Regions faintly defined. There is a short line of indistinct flat- 
tened tubercles extending back from each rostral lobe, and two or three 
