MUSEUM OF COMPARATIVE ZOOLOGY, 183 
branchial region. There is a medium spine on the second, third, and fifth ab- 
dominal segments, and a rudiment of one on the fourth. The abdominal pleure 
have rounded external angles. The eyes are freely movable and destitute of 
spines. The second antennal segment is armed with a prominent external 
spine. The chelipeds are robust, setose, and granulate ; the merus has a short 
superior spine and two lateral spines at the distal end; the carpus is similarly 
equipped, though on one side the superior spine is obsolescent ; the chela is 
broad and strong, the fingers excavated, denticulated on their cutting edges 
and at their tips, The merus of the first pair of ambulatory appendages has 
an external distal spine ; the carpus of all the ambulatory limbs has two longi- 
tudinal ridges, and that of the first and second pair has a spine on the upper 
border at the distal end of the joint. 
Length, 55 mm.; breadth, 18 mm.; length of carapace, 31 mm. ; rostrum, 
8 mm, 
Station, 3394. 511 fathoms. 1 male. 
Munidopsis hystrix, sp. nov. 
Jarapace setose and thickly covered with small spiny tubercles; three 
spines of special prominence on the gastric area disposed in the form of a 
triangle with apex directed backward; one on the cardiac area; two (rarely 
six) on the hind margin of the carapace; one on each branchial area. There 
is a spine at the external angle of the orbit, and the lateral margin of the cara- 
pace is spinose. The rostrum is long, lightly curved upward from the base to 
the tip, and armed with from two to five spines on each side; these spines 
are unsymmetrically arranged on the two sides. The second, third, and 
fourth abdominal segments are conspicuously two-ridged; the second seement 
has a pair of small spines on the anterior ridge, and another pair nearer the 
median line on the posterior ridge; the third segment also has a pair of spines 
on the anterior ridge, and in some specimens a third spine in the median line 
on the posterior ridge. The abdominal pleure are truncate, The chelipeds 
are long, very spiny from the proximal end of the merus to the base of the 
fingers; the chief spines of the propodus are on the upper margin of the seg- 
ment; there are two spines near the base of the dactylus. The ambulatory 
appendages are long, setose, and spinose except the daetylus joint. A spine 
over the eye, Antenne shorter than the body; a spine on the outer side of 
the first segment, one on each side of the second and third segments, and one 
on the upper side of the third segment. 
Length of ovigerous female, 47 mm. ; length of carapace, 25 mm. ; breadth, 
15 mm. ; rostrum, 8 mm. 
Station 2417. 493 fathoms. 1 male, 2 females ovig. 
‘903424, 1078 =) € 4 females (2 ovig.). 
ABD, RIO ot 7 males, 5 females (2 ovig.). 
