THE CANCROID CRABS OF AMERICA 257 



Range. — EjQown only from the type-specimen (female) from off 

 Hood Island, Galapagos Islands; lat. 1° 21' 30" S.; long. 89° 39' 45" 

 W.; 20 fathoms; Co. S.; April 7, 1888; station 2812, Albatross (21578). 



ACTAEA RUFOPUNCTATA NODOSA Stimpson 



Plate 105, Figures 1-2 



Actaea nodosa Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1860, p. 203 [75] 

 (type-locality, Tortugas, Florida; type not extant). — A. Milne Edwards, 

 Nouv. Arch. Mus. Hist. Nat., Paris, vol. 1, 1866, p. 266, pi. 17, figs. 6-6c. 



Actaea rvfopunctaia var. nodosa Miers, Challenger Rept., Zool., vol. 17, 1886, 

 p. 122. — A. Milne Edwards and Botjvier, Mem. Mus. Comp. Zool., vol. 

 47, 1923, p. 316. 



Actaea rufopunctata nodosa Rathbun, Bull. U. S. Fish. Comm., vol. 20 for 1900, 

 pt. 2 (1901), p. 33. 



Actaea rufopunctata Odhner, Goteborg's K. Vet. Handl., Fjarde Foljden, vol. 29, 

 No. 1, 1925, p. 60 (part). 



Diagnosis. — Carapace nodulous, nodules high and formed by dis- 

 tinct granules. Internodular depressions hairy. Anterior meso- 

 gastric nodule small. Nodules 1 F not fused with frontal margin. 



Description. — Carapace broad, ovoid, its extreme length not quite 

 three-fourths, but more than two-thirds its extreme breadth; its 

 surface broken by deep and broad grooves into numerous (about 

 twenty-seven, excluding those around the orbits and the front) very 

 convex lobules, which are covered very closely with large vesiculous 

 granules; grooves filled with a dense short felt, with longer hairs some- 

 times interspersed, against which the lobules stand out hke islands. 

 Exposed surface of carpal and propodal joints of chelipeds and l?gs 

 lobulated in same style as carapace. Front strongly deflexcd, but 

 somewhat prominent and rather sharply bilobed. The tumid supra- 

 orbital margin broken by two cross grooves and separated from lower 

 margin of orbit by a fissure. Antero-lateral borders cut into four 

 rounded lobules of nearly equal size by deepish fissures. Outer angle 

 of basal antennal joint in contact with inner angle of lower edge of 

 orbit. Edges of legs and of arm fringed with coarse hair. Lower 

 outer surface of hand with granules arranged in lines. Fingers blunt- 

 pointed, hollowed out at tip. 



This subspecies or variety or form which inhabits the Atlantic is 

 distinguished from the principal or typical form which inhabits the 

 Pacific and Indian Oceans by the reduction of the small anterior 

 median nodule of the mesogastric region. It may extend to the 

 middle of the adjacent protogastric nodule, while in typical rufo- 

 punctata it extends as far as, or farther than, the end of that nodule. 

 The frontal nodules (1 F) are not fused with the margin of the front. 



Measurements. — Female (15010), length of carapace 16, width 22.7 

 mm. Female (Stimpson), length 16.25 mm. (0.64 inch), width 24.63 

 mm. (0.97 inch). 



7985&— 30 18 



