THE CANCROID CRABS OF AMERICA 285 



ing transversely inward on the carapace; this portion is accented by 

 furrows behind and before. The antero-lateral margin is considerably 

 divided and subdivided into teeth and denticles or crenules whose true 

 relations are indicated by the three broad fuiTows which divide the 

 margin into four parts. The first lobe, which is confluent and in line 

 with the orbital angle, is transversely oblique and is divided into four 

 or five denticles followed by a small bidentate lobe ; the second lobe is 

 divided into a large subacute triangular tooth with a denticle on 

 each slope followed by a small bidentate lobe; the third projection is 

 the largest, dentiform, and has 2 or 3 denticles on its outer margin; 

 last tooth narrow, simple. Front bilobed, lobes with concave 

 margins, median sinus a narrow slit. Inner orbital angle blunt, 

 inner margin of orbit raised and separated by a furrow from the 

 frontal region; the two suborbital teeth small, the outer one lobiform, 

 the inner one narrow, acute, much less advanced than the tootk 

 above it. 



Merus of outer maxilliped broader than long, distal margin slightly 

 oblique, arcuate; outer lobe more advanced than inner. Chelipeds 

 coarseh^ granulate; merus roughly denticulate above and with a 

 strong rectangular subdistal tooth; carpal tooth stout; palms elongate, 

 much exceeding fingers; a groove on outer surface just below upper 

 margin. The dark color extends the whole length of the fingers along 

 the prehensile edges, but only two-thirds the distance on outer edges; 

 a strong tooth at base of major dact}^. A furry covering on the 

 dactyls of ambulatory legs except in the lateral furrows. 



Measurements. — Male (32842), total length of carapace 45, width 

 of same 62.3, fronto-orbital width 22, width of front 13.4 mm. Male 

 holotype, length of carapace 75, width of same 100 mm. (A. Milne 

 Edwards). Male, Puerto Priamides, length of carapace 75, width 

 109 mm.; length of right palm through middle 73, width 35, thickness 

 23 mm. ; length of left palm through middle 64, width 29, thickness 

 18 mm.; length of right movable finger from top at articulation to 

 tip, 65, of left ditto, 53; right fixed finger broken, length of left from 

 base of sinus to tip, 40 mm. 



Range. — Uruguay to Patagonia. 



Material examined. — 



URUGUAY.— Cabo Santa Maria; F. Felippone; 1 male (32842). 



East of Cabo Santa Maria; lat. 34° 50' S., long. 52° 20' W.; 58-65 

 athoms; Undine; 1 male (Buenos Aires Mus., 16658); carapace 94 

 mm. wide; photographs sent by M. Doello-Jurado. 



Off Mar Chiquita; lat. 37° 50' S., long. 56° 00' W., 1 male (Buenos 

 Aires Mus., 17635); carapace 97 mm. wide; photographs sent by M. 

 Doello-Jurado. 



ARGENTINA.— Mar del Plata: August 7, 1918; 1 female (60824); 

 received from Buenos Aires Museum. Twenty-five fathoms; March, 



