BULLETIN OF THE UNITED STATES FISH COMMISSION. 
88 
Chelipeds covered with granules like those on carapace; ambulatory legs slender, covered with 
smaller granules. Inferior surface of body also granulous. 
Dimensions of female: Length, 6.5 mm.; width, 6 mm. 
Mayaguez Harbor, 22 to 33 fathoms, station 6064; and 4 to 6 fathoms, station 6065 (Fish Hawk). 
Bahama Banks; west Florida, 29 fathoms; Barbados, 7 to 50 fathoms. 
Genus LITHADIA Bell. 
Lithadia Bell, Trans. Linn. Soc. London, xxi, 305, 1855. 
Carapace subrhomboidal, with cardiac region produced posteriorly, lateral margins produced 
over bases of legs; surface very uneven, branchial and cardiac lobes elevated, hepatic region much 
depressed; the subhepatic region forms a distinct and oblique facet; surface rough with granules or 
tubercles. Front produced, narrow, upturned, orbits small; a considerable space between edge of 
lower wall of orbit and free edge of buccal cavern. The merus of external maxillipeds is much more 
than half the length of ischium measured along inner edge. Outer margin of second segment of 
exognath nearly straight. Chelipeds rather short and heavy. Abdomen of both sexes with five 
segments. 
Lithadia pontifera Stimpson. 
Lithadia ponti/era Stimpson, Ann. Lyc. Nat. Hist. N. Y., x, 115, 1871. 
Spelxopliorus triangulus A. Milne Edwards, Bull. Mus. Comp. Zoo!., vui, 23, 1880. 
Carapace one-sixth broader than long in male, one-fifth broader than long in female, widest at 
anterior lateral angles. Branchial protuberance divided into two — one part connected by a ridge with 
anterior lateral tooth, the other by a thicker ridge with posterior lateral tooth. A median tuberculated 
ridge extending from frontal region to cardiac, interrupted at center of carapace. Between cardiac 
and branchial region on either side is a deep, narrow cavity, bridged over by the meeting of a projec- 
tion from posterior branchial protuberance. The hepatic region is not very protuberant above and 
bears a short longitudinal ridge. Entire upper surface granulated. Protuberances of carapace smaller 
than usual, but prominent, and covered with tubercles or granules much larger than those on the 
depressed parts. Anterior lateral tooth (that on branchial region forming antero-lateral angle of body) 
is very large and prominent, and there is a smaller triangular tooth in front of it, pointing downward. 
Between this latter and the triangular hepatic tooth is a deep sinus. Subhepatic tooth very prominent 
and tuberculated. Posterior lateral tooth obtusely rounded. Posterior margin thinner than anterior 
and lateral margins on account of the deep excavation around cardiac region; intestinal region bilobed, 
but the lobes do not form dentiform projections, the posterior outline being nearly straight when 
viewed from above, though interrupted at middle. The front has a deep sinus at middle and is some- 
what bimarginate. Epistome very short. External maxillipeds granulated. Chelipeds flattened; 
arm with an outer dentate crest; hand cristate outside and with a short and prominent line of tubercles 
on inner side near wrist. Ambulatory legs granulate and tuberculate, tubercles acorn-shaped. Sternum 
of male granulate, abdomen sparsely so and bearing an appressed backward-pointing spine at proximal 
end of penultimate segment. Abdomen of female densely tuberculate. 
Dimensions of male: Length, 6.5 mm. ; width, 7.5 mm. Female: Length, 11 mm. ; width, 13.1 mm. 
Off Culebra, 15} fathoms, station 6087, 1 male. Barbados (type locality); Key Largo, Florida, 
among corallines, low tide; off Cape Fear, North Carolina, 15 fathoms; Charlotte Harbor, Florida, 11 
fathoms, and Sand Key, Florida, 125 fathoms (A. Milne Edwards). 
This species, as well as Speloecqihorus elevatus, can hardly be separated from Lithadia. S. elevatus 
approaches the nearest to Spelceophorus nodosus, the type of Spelceophorus, which is perhaps not a valid 
genus. 
Genus SPELCEOPHORUS A. Milne Edwards. 
Spelceophorus A. Milne Edwards, Ann. Soc. Entom. France (4) v, 148, 1865. 
Carapace wide, triangular, or pentagonal, moderately convex, with the lateral borders prolonged 
above the bases of the legs. Posterior margin wide and having two deep and smooth cavities, one 
on each side, which open on the outside by two large oval orifices and are excavated far into the 
carapace; a suture line above and between the two openings perhaps represents the true posterior 
margin. Exognath of outer maxillipeds obtuse and shorter than the endognath. Chelipeds short 
and stout. Abdomen with five segments. 
