166 BULLETIN OF THE 
the only male specimen obtained), coxa tuberculate on the lower face, the fol- 
lowing segments armed with strong spines, fingers excavated within, slightly 
gaping, penicillate, cutting edges entire. Ambulatory appendages very long, 
second and third pairs of about equal length and longer than the first pair; 
all of them armed, like the chelipeds, with spines; the spines tend toward a 
regular arrangement in longitudinal rows, and the spaces between the spines 
are smooth and naked, i. e. nearly free from spinules, tubercles, or sete. 
Second segment of abdomen composed of a single calcified plate, marked by 
a deep hollow on each side of the middle ; the other segments of the abdomen 
are of a leathery, semi-membranaceous consistency, and are made up of five 
longitudinal rows of plates, viz. one median row, flanked by a row on each 
side, the latter in turn bounded externally by a marginal series; whole sur- 
face of abdomen verrucose. 
Length of carapace, including rostrum, 84 mm.; breadth, 78 mm.; breadth 
between the antero-lateral angles of carapace, 34 mm.; length of last ambula- 
tory appendages, 242 mm.; merus, 76 mm.; carpus, 36 mm.; propodus, 64 mm.; 
dactylus, 47 mm. 
In the female the right chela is larger than the left, and the prehensile edges 
of the fingers are furnished with blunt teeth. The abdomen is asymmetrical, 
the apex turned to the right, the marginal plates absent from the left side; the 
right side bears but one ovigerous appendage (the first). The abdomen nearly 
conceals the basal segments of the thoracic legs, which in the male are almost 
entirely exposed. 
Station 3371. 770 fathoms. 1 male, 1 female ovig. 
The egg measures 2 mm. in diameter. 
Lithodes panamensis, sp. nov. 
Carapace subpyriform, of about equal length and breadth; gastric and 
branchial regions very convex ; a deep depression on each side at the anterior 
limit of the branchial areas, and another between the gastric and cardiac areas. 
Rostrum cylindrical, terminating in three spines or teeth, one of which is me- 
dian, the other two lateral; a long horn, slightly upcurved, is given off from 
the lower side of the proximal end of the rostrum. The whole surface of the 
carapace is rough with low warty protuberances ; the gastric region bears two 
pairs of spines, the anterior pair separated by a greater interval than the pos- 
terior pair. Two small spines on each branchial area, and two on the intes- 
tinal region. The orbit is bounded externally by a prominent spine, and 
there are five more spines on the lateral border of the carapace, viz. one at the 
antero-lateral angle, one on the hepatic region, and three on the branchial. 
Besides these there is a rudimentary lateral spine near the anterior limit of the 
branchial region, The posterior margin of the carapace is tuberculated, not 
spinose. The third segment of the antennular peduncle is equal to the first 
segment in length, and considerably longer than the second segment. The 
