THE SPIDER CRABS OF AMERICA 159 



one rounded, not at all notched for the reception of the palpus; this 

 last is short and stout, almost concealed by the merus. The third, 

 fourth, and fifth segments of the male abdomen are coalesced. 

 Contains only one species. 



MOCOSOA CREBRIPUNCTATA Stimpson 



Plate 49, figs. 3 and 4 



Mocosoa crebripunclata Stimpson, Bull. Mas. Comp. Zool., vol. 2, 1871, p. 

 128 (tj^pe-locality, off French Reef, Florida, 15 fathoms; holotype not 

 extant). — A. Milne Edwards, Crust. R6g. Mex., 1878, p. 137. — Rathbun, 

 Proc. U. S. Nat. Mus., vol. 17, 1894, p. 65. 



Diagnosis. — Eyes immovable. Merus of outer maxillipeds not 

 notched at inner angle. Rostrum sub triangular, subtruncate. 

 Carapace lumpy. 



Description. — Carapace very convex antero-posteriorly, naked, 

 punctate and uneven; two prominences between the eyes, three on 

 the gastric region of which the posterior 

 is mesogastric, one large, bituberculate 

 protuberance on the cardiac region, one 

 on each hepatic, and three on each branch- 

 ial region. Of the three branchial protu- 

 berances the most anterior is the largest; 

 the two posterior are in a transverse line, 

 the outermost being marginal and bearing 

 a small ttibercle at the posterolateral angle 

 of the carapace. Rostrum deflexed, slightly 

 emarginate. The regular curve of the eye 

 socket is interrupted by a very shallow, 

 posterior tooth, which does not project 

 outwardly and is scarcely evident in dorsal fig.59.-mocosoacrebripunctata, 

 view; no preocular spine. Subbranchial "^"-^ (18129), maxiluped. the 



^ , ^ CARAPACE 13 7 MM. LONG. 



region granulate. 



Chelipeds stout, longer than carapace; merus cylindrical, sparingly 

 granulate; carpus subglobular. Manus slightly compressed, widen- 

 ing distally; propodal finger very short, stout, bent downward; 

 dactylus longer, very deep at base, much deflexed; fingers spoon- 

 shaped, when closed leaving a narrow slit, cutting edges dentate. 

 Legs short, thick; merus armed with a few short blunt spines or 

 tubercles arranged in two rows along upper surface; dactylus as long 

 as preceding article, curved and gradually tapering. 



Color. — Body of a strawberry color; upper surface of carapace 

 iridescent. (Stimpson.) 



Measurements. — Male (18129), length of carapace 7, posterior 

 width 6.2, hepatic width 5.4, approximate length' of cheliped 9, 

 of last ambulatory leg 4 nun. Female (immature), holotype, length 

 of carapace 0.2 inch (5 mm.) , width 0.17 inch (4.3 mm.). (Stimpson.) 



