THE BRACHYURA AND MACRURA OE PORTO RICO. 
87 
eroded, the regions not all demarcated. The front is well delimited from the carapace, and although 
the dentiform prolongations of the septa of the branchial channels may sometimes project beyond it, 
yet the whole of edge of buccal cavern is never in the adult seen beyond it in a dorsal view. Hepatic 
region, the side wall of which commonly forms a distinct facet, generally separated from branchial 
region by a broad notch in antero-lateral margin. The orbits are deep, and although the upper edge 
is a little emarginate, the retracted eye is completely concealed; the three sutures in the roof and outer 
wall are A'ery distinct; the floor coincides with roof of buccal cavern. Antennae loosely lodged in gap 
at the inner canthus of orbit. The antennules fold obliquely. Buccal cavern elongate; the acutely 
triangular merus of external maxillipeds is not much more than half the length of ischium measured 
along inner edge; the second segment of the exognath has the outer margin more or less curved. 
Chelipeds rather massive. Abdomen of the male consists of four or five pieces, that of female of five. 
Persephona punctata (Linnaeus). 
Cancer punctatus Lin nseus, Sys. Nat., ed. 10, i, 630, 1758 (part). 
PerSephona punctata Stimpson, Ann. Lyc. Nat. Hist. N. Y., vn, 70, 1859. 
Carapace globular, with three sharp, recurved spines, one at either end of posterior margin and 
one median just above posterior margin. On the outer surface of carapace are numerous, but not 
crowded, granules of unequal size, most of which are visible to the naked eye. Regions of carapace 
ill defined. Front broadly bidentate, and the spiniform angles of the branchial channels can be seen 
beyond it in a dorsal view. Behind tip of front the antero-lateral boundary of carapace is formed by 
the side wall of the subhepatic region, which is continuous with upper surface of carapace and bounded 
below by a line of granules, on which, near posterior end, is a tubercle; this tubercle is smaller in the 
adult than in the young, where it is dentiform. Between hepatic and branchial regions is a very 
shallow and ill-defined notch or sinus in margin. Branchial margin marked by a line of bead granules 
extending as far as the posterior margin, which is on a lower level and also granulate. Maxillipeds 
granulate. Chelipeds rather stout, about 1.5 times the length of carapace in the adult male. Arm 
cylindrical and tuberculate and granulate, more coarsely above than below, and proximally than 
distally. Wrist and hand much smoother, very finely granulate above and below, coarsely granulate 
along margins. Palm nearly twice as long as wide, flattened, and a little dilated. The fingers (at 
least the dactylus) are as long as the palm, and curved; their edges are finely denticulate and meet 
for the greater part of their length. Legs stoutish; propodus of first pair reaches to end of wrist of 
cheliped; dactyl i lanceolate and fringed with stiffish hairs. The third, fourth, and fifth segments of 
the male abdomen are fused. 
Dimensions of male: Entire length of carapace, 36.7 mm.; width, 32.2 mm. 
Mayaguez, 1 young specimen. San Juan (Gundlach). Ranges from North Cai’olina to Sabanilla, 
United States of Colombia; Gulf of Mexico. 
Genus EBALIA Leach. 
Ebalia Leach, Mai. Podoph. Brit., text of pi. xxv, 1817. 
Carapace rhomboid or pentagonal or hexagonal, usually, but not always, a little broader than 
long; its regions usually well defined and tumid, tumid portions nodular or granular; its posterior 
margin is generally a little prominent and either bilobed or with its extreme ends dentiform. In 
the orbital Avail there are, as usual, three sutures, and a gap at inner canthus; edge of roof of orbit 
considerably emarginate. The antennules fold obliquely or nearly transversely. Antennse minute 
but distinct. Buccal cavern moderately elongate; the exopodite of external maxillipeds not dilated, 
its outer edge a little curved; triangular merus of external maxillipeds about three-fourths length 
of ischium measured along inner border. Chelipeds A’ariable, usually massive; in the typical forms 
short, not much more than half again as long as carapace, and stout, with short, broad hands not 
differing much in length from the stout, compressed fingers. The abdomen of the male consists of 
three or four pieces. 
Ebalia stimpsonii A. Milne Edwards. 
Ebalia stimpsonii A. Milne Edwards, Bull. Mus. Comp. Zool., vm, 22, 1880. 
Carapace hexagonal, a trifle longer than broad; surface more even than usual in thisgenus; hepatic 
region depressed, cardiac region swollen, and surrounded by a depression; a postero-lateral lobe in 
transverse line with cardiac region; posterior border nearly straight, terminating in lobiform angles; 
surface covered Avith large, flat, croivded granules, larger on posteripr half. Front concave, emarginate. 
