178 GEOLOGY AND PALEONTOLOGY OF THE WEST INDIES. 



Paratypes. The paratypes are from the same locality as the holo 

 type: a, male, Cat. No. 2260; 6, female, Cat. No. 2262; c, male, and 

 d, female, Cat. No. 2263; all in Mus. Phila. Acad. Nat. Sci. 



Measurements. Length of carapace of holotype on median line 34.3 

 mm., width of carapace 45.2 mm., width of front 13.2 mm., width 

 between outer angles of orbits 25.3 mm. 



The following is a description of this species : 



The regions are surrounded by deep furrows and are more or less sub- 

 divided. The epigastric lobes are separated from the protogastric, and the 

 crescentic urogastric lobe from the mesogastric; the hepatic lobe is separated 

 from the dentate lateral border, while the branchial region is divided into an 

 epibranchial lobe, which incloses the penultimate lateral spine, a mesobran- 

 chial lobe, which is divided in three, and a metabranchial lobe which is 

 separated partly from the cardiac region by a sharp, thumb-nail impression, 

 while it is anteriorly confluent with that region by a narrow connecting eleva- 

 tion; cardiac region truncate behind and longitudinally grooved in its anterior 

 two-thirds ; the elevation occupying the intestinal region is continued laterally 

 across the branchial region; the frontal region is separated from the edge of 

 the front by a shallow depression. The surface of the carapace is rough, 

 except in the furrows and on the epigastric lobes, the roughness consisting of 

 (1) subacute, somewhat imbricating, white-tipped tubercles, most evident 

 on the sides and posterior half, and (2) a mixture of blunter tubercles and 

 erosions on the middle of the anterior half. Antero-lateral teeth 5, thick, 

 subconical; the first one, at the outer angle of the orbit, is small, little advanced; 

 first interspace the greatest of all; fourth tooth largest, third tooth next in 

 size, fourth and fifth curved. Above the posterior margin a row of fine bead 

 granules. The marginal lobes of the front are bordered by 12 or 13 granules, 

 the lobes are more advanced at the inner angles, the outer angles are slightly 

 advanced, but not isolated, intermediate space concave, median sinus 

 V-shaped. Margin of orbit granulate, upper margin raised, edge biemar- 

 ginate, the notches continued backward in a furrow; a larger notch below the 

 outer angle; lower margin more advanced than upper, furnished with 2 stout, 

 granulated teeth, one of which is within the outer angle and the other at the 

 inner angle, next to the antennal segment. This segment touches with its 

 outer angle the bent-down edge of the front; it has a longitudinal granulated 

 ridge. A piece of the eyestalk shows a few small granules above at the base. 



The chelipeds are unequal, the smaller palm about four-fifths as high as the 

 larger. Merus very broadly triangulate, not much longer than the distal 

 width, outer surface sparsely covered with sharp granules and tubercles; 

 upper margin with 3 spines, the distal one much the largest. Carpus rough 

 with short spines; the spine at the inner angle is large and bears a spinule on 

 its posterior margin. Manus armed with spines on the outer surface except 

 near the fingers, the spines arranged mostly in 6 or 7 irregular rows. The 

 lower edge of the propodus is sinuous, the distal half of the finger being 

 strongly deflexed; the dactylus is longer than the upper margin of the palm; 

 fingers with a few irregular teeth, a large tooth at the base of the dactyl in 

 the larger chela; fingers not gaping; dactylus spinulous on the basal third of 

 its upper margin; the dark color extends the full length of the prehensile 

 edges, but elsewhere in the larger chela it spreads over all but the very base of 

 the dactylus, in the smaller chela not so far; on the fixed finger the color 

 extends about three-fifths the length on the lower edge. The anterior surface 

 of the merus of the ambulatory legs and the posterior surface of the last leg 

 are granulate, the upper margin spinous; remaining joints of legs not visible. 



