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VOL. XV, 
ie PROCEEDINGS OF THE NATIONAL MUSEUM. 263 
- When the hairs are removed, the surface is speckled with small pur- 
ple spots. 
Length of carapace, with rostrum, 28; width, with spines, 30; without 
spines, 24; length of cheliped, about 26 millimeters. 
Three males and one young female were collected at Abaco, Baha- 
mas, by the U.S. Fish Commission steamer Albatross, 1856 (16299). 
This species is very distinct from any hitherto described. Like spino- 
sissimus, aculeatus, and cornutus, it has spines on the manus, but it is 
readily distinguished from those species by the stout lateral spines, the 
dense pubescence, and the short legs. 
Mithrax hemphilli, sp. noy. 
Plate XXXvil, fig. 2. 
Carapace oblong-triangular, covered with strong tubercles and gran- 
ules. Regions distinct. The largest tubercles are arranged as fol- 
lows: One on either side of the median line on the frontal region; a 
transverse row of four on the gastric; two on the median line of the 
mesogastric, the posterior one being the larger; one on the genital 
region; a line of three across the cardiac forming a transverse curve 
concave to the front; behind these, one on the median line; about 
seven strong tubercles on the branchial region, those most posterior 
being spinous; four spinous tubercles on the intestinal region forming 
a transverse curve concave to the posterior margin. The two tubercles 
at the extremities of this curve are continuous with a line of granules 
which border the posterior margin. The two central protuberances of 
the marginal line are small tubercles. Besides the strong tubercles of 
the carapace, there are numerous smaller tubercles and granules, scat- 
tered or clustered about the larger tubercles. There is a row of gran- 
wles just within and parallel to the posterior margin of the mesogastric 
region. 
Rostrum rather long for the genus, but not so long as in acuticornis, 
divided by a U-shaped sinus, each horn bearing two or three minute 
denticles on its outer margin near the tip. Preocular tooth long, acu- 
minate. The two sinuses of the upper orbital margin small, V-shaped. 
Antero-lateral teeth four, stout, conical, pointed, and so embossed 
with granules about their sides that their margins have more or less 
the appearance of being denticulate. There is a spiny tubercle in the 
sinus between the second and third teeth, also a spine near the margin 
of the branchial region just back of the last antero-lateral tooth, which 
forms the angle of the carapace. 
The basal joint of the antenna is armed with four spines and teeth. 
There is a long slender spine at the anterior outer angle, and farther 
back a broad triangular tooth which forms part of the orbital margin. 
At the base of the movable joint is a prominent spiniform tooth, visi- 
ble in a dorsal view. Just below the sinus between the two marginal 
teeth is another small tooth, which, with the one at the base of the 
