THE BRACHYURA AND MAORURA OF PORTO RICO. 
13 
its inner angle. Lateral teeth two, broad, lobate, obtuse; in large specimens a third very small tooth 
or tubercle behind the second. 
There are two forms of the male in this species. In one the appendages of first segment of abdomen 
are strong and twisted, tip bilobed, inner lobe thinner and longer than outer. In the second form the 
appendages are weaker and not twisted, the tip less spreading. In the first form, the chelipeds are 
very unequal, the left always slender and weak, the right large and heavy. Both chelipeds tuberculate 
and pubescent. Carpus covered with irregular laminiform lobes; manus surmounted by a double 
crest of same. Width of right manus at its distal end equals one-half length of carapace. Pollex very 
short. Dactylus strongly bent down, overlapping pollex at tip. Left manus a little more than one-third 
width of right, enlarging but little toward the long and rather narrow fingers. In the second form of 
the male the right manus is about twice the width of left and its fingers are also long and slender. In 
the female the hands are more nearly equal. The second ambulatory leg is about twice the length of 
carapace; the first reaches about the middle of propodus of second; the third reaches about middle 
of dactylus of second. The meri are rough with squamose tubercles, and have two longitudinal grooves 
on upper surface and one on anterior surface. The anterior margin terminates in a blunt rectangular 
tooth in the second and third pairs; in the first pair this tooth is produced outward toward the carpus. 
Posterior margin of the dact-yli concave as a whole, but nearly straight for the proximal two-thirds. 
Dimensions of male, form i: Length, 6.6 mm.; width, 7.6 mm.; length of second ambulatory leg, 
14 mm.; length of merits, 4.4 mm.; carpus, 2.2 mm.; propodus, 3.6 mm.; dactylus, 3.2 mm. Male, 
form ii: Length, 11 mm.; width, 13.2 mm. 
Off St. Thomas, 20 to 23 fathoms, station 6079, Fish Hawk , 1 male, form i, and 1 young female. 
From off Cape Hatteras to the Gulf of Mexico, 24 to 60 fathoms. 
Palicus sica (A. Milne Edwards). 
Cymopolia sica A. Milne Edwards, Bull. Mus. Comp. Zool., vm, 29, 1880 (part). 
Palicus sica Bathbun, Proe. Biol. Soc. Wash., xi, 97,1897. 
Carapace granulate, many of the granules forming clusters on the more elevated regions. Front 
with four small tuberculiform teeth, the median the most prominent, separated from each other bv a 
deep triangular notch and from the lateral teeth by very broad shallow sinuses. The tooth of the 
.superior orbital border nearest preorbital is arcuate; the next narrower, also obtuse. The median 
suborbital lobe is subtriangular and much less advanced than inner lobe. The lateral margin of cara- 
pace bears three small thickened teeth. Just above posterior margin a sinuous line of tubercles. First 
segment of abdomen with a narrow Carina on either side behind the postero-lateral angle of carapace. 
Second carinated throughout its width, the carina much longer in center. Third segment carinated, 
but much less sharply. A carina on sternum, in a line with suture between second and third abdom- 
inal segments, extends well outwardly, but not so far posteriorly as the second abdominal. These 
canine form horizontal plates, visible in a dorsal view, excepting that of the third abdominal segment 
in the male. Chelipeds slender and feeble. Ambulatory legs of moderate length, the third very little 
. shorter than second, the first very slender and reaching about midway of carpus of second; merus 
of second pair long and comparatively narrow; of second and third pairs with longitudinal rows of 
spinules, and a deep groove on anterior half; anterior distal angles subrectangular. 
Length of adult female, 9.8 mm.; width, 13.5 mm. The width varies from 1.25 times its length 
in small specimens to 1.39 times its length in large ones. 
Mayagiiez Harbor, 97 to 120 fathoms, station 6067, 1 young male. From the Gulf of Mexico and 
Florida Keys to Barbados and Grenada, 60 to 117 fathoms. 
Family GECARCINIDtE Milne Edwards, 1837. Land Crabs. 
Carapace dorsally very convex, especially dilated over and in front of the branchial regions, with 
the antero-lateral margins usually entire and strongly arcuate. The front is of moderate width and 
strongly deflexed. The orbits and eye-stalks are of moderate size. The third maxillipeds have the 
fifth joint articulated at the front outer or near the front inner angle or at the apex of the fourth, 
which sometimes completely conceals it. The chelipeds in the adult male are powerful, usually 
unequal. The seventh joint in the walking legs is nearly always granulated and armed with longi- 
tudinal rows of spines. The pleon of the male usually covers the whole space between the bases of 
the last pair of walking legs. 
