THE CANCROID CRABS OF AJVIERICA 263 



Off Gallards Bank, Porto Rico; tangent of Murillo de Cabo Rojo, 

 E. SE. % E., 9K miles; 10 fathoms; Co. S.; temperature 26.3° C; 

 January 26, 1899; station 6076 (148), Fish Hawk; 1 female (24272). 



Fernando Noronha, Brazil; 1876-1877; R. Rathbun, Hartt Ex- 

 plorations; 2 males (40625). 



Other records. — St. Bartholomew (Odhner) ; Guadeloupe (Desbonne 

 and Schramm); Fernando Noronha (Pocock). 



Genus GLYPTOXANTHUS A. Milne Edwards 



Glypiozanthus A. Milne Edwards, Crust. R^g. Mex., 1879, p. 263; type, G. 



erosus A. Milne Edwards = Adoea erosa Stimpson, 1859. 

 Adaea Odhner, Goteborg's K. Vet. Handl., Fjarde Foljden, vol. 29, No. 1, 



1925, p. 35 (part). 



Near Adaea. Body thick, the lateral margin continued anteriorly 

 downward and forward to the angle of the buccal cavity; suborbital 

 region deep. Antero-lateral margin distinctly separated from the 

 postero-lateral, having a strong tooth or lobe at the lateral angle. 

 Surface, in American species, deeply eroded, above and below and 

 on the appendages, except the dactyls of the ambulatories -which 

 are rough with granules and sharp spinules. The frontal lobes are 

 rounded and deflexed to a line below the level of the orbits. Orbits 

 deep and almost round. Basal antennal article wide and wedged 

 between front and lower margin of orbit. Inner distal angle of 

 merus of maxilliped deeply cut. Fingers pointed. Ambulatory 

 legs strong; they with the chelipeds when retracted fit close together. 



Middle America; West Africa; Cape Verde Islands; Red Sea. 



KEY TO THE AMERICAN SPEQES OF THE GENUS GLYPTOXANTHUS 



A^ Cardiac elevation without long transverse furrows. Both lateral and median 

 mesogastric punctae. 

 B*. Vermiculations very rough, intervening furrows narrow. 5 L convex. 



Outer areole of 2 M independent anteriorly erosus, p. 263. 



B^. Vermiculations smooth, intervening furrows wide. 5 L flat. Outer 



areole of 2 M entirely independent labyrinthious, p. 266. 



A'. Cardiac elevation with two long transverse furrows. Mesogastric punctae 



median only. Outer areole of 2 M confluent with epigastric area 



vermiculatus, p. 266. 



ANALOGOUS SPEQES OF GLYPTOXANTHUS ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



erosus labyrinthicus 



GLYPTOXANTHUS EROSUS (Stimpson) 



Plate 107 



Actaea erosa Stimpson, Ann. Lye. Nat. Hist. New York, vol. 7, 1859, p. 51 [5] 



(type-locality, Florida; type not extant). 

 Xantho vermiculatus Desbonne and Schramm, Crust. Guadeloupe, 1867, p. 27 



{teste A. Milne Edwards). 

 Olyptoxanthus erosus A. Milne Edwards, Crust. Reg. Mex., 1879, p. 254, 



pi. 43, figs. 3 and 3a; pi. 44, figs. 4-4c. 



