OXTSTOMATOUS AND ALLIED CRABS OF AMERICA 55 



over the surface, generally in groups of three or four, of unequal 

 lengths. Surface of carapace beneath the setae densely granulated; 

 granules not prominent; sulci defining areolets of moderate depth. 

 Anterolateral margin as long as posterolateral, regularly curved and 

 armed with five small spines, not including that at angle of orbit. 

 Front lo^v-triangular ; margin somewhat arched, and continuous with 

 the superior margin of orbit, which forms a low projection opposite 

 the juncture of the cornea of the eye with its peduncle. Dactyls of 

 ambulatory feet setose and have black, much-curved unguiculi. 



Color. — More or less reddish or crimson; setae of a light golden 

 color. 



Measurements.— Me\e (68316), length 20.4, width 27.2 mm. Fe- 

 male (68314), length 16.5, width 21.8 mm. 



Habit. — Stimpson says ^ of the last pair of feet, "not prehensile, 

 since the animal does not cover itself with a foreign body like the 

 Dromiae; and they fill, apparently, no office in the economy of the 

 animal, except when in place, they fill up neatly the chink between 

 the carapax and the stouter walking feet." 



Eange. — West coast of Mexico to Galapagos Islands. 



Material examined. — See table 15, page 56. 



Genus ACANTHODROMIA A. Milne Edwards 



Acanthodromia A. Milne Edwards, Bull. Mus. Comp. ZooL, vol. 8, p. 31, 1880 

 (type, A. erinacea A. Milne Edwards). — Bouvier, Bull. Soc. Philom. Paris, 

 ser. 8, vol. 8, p. 56 [23], 1896. — Alcock, Journ. Asiat. Soc. Bengal, vol. 68, 

 p. 134, 1899; Catalogue of the Indian decapod Crustacea in the collection 

 of the Indian Museum, fasc. 1, p. 36, 1901. — Ortmann, in Bronn's Klassen 

 und Ordnungen des Thier-Reichs, vol. 5, pt. 2, Arthropoda, p. 1155, 1901. — 

 A. Milne Edwards and Bouvier, Mem. Mus. Comp. ZooL, vol. 27, p. 22, 

 1902. 



Differs from Dynomene in having the carapace longer than broad, 

 convex, closely covered with spines instead of hairs. 

 Caribbean Sea; Andaman Sea; 75 to 150 fathoms. 



ACANTHODROMIA ERINACEA A. Milne Edwards 



Plate 12, Figures 5, 6 



Acanthodromia erinacea A. Milne Edwards, Bull. Mus. Comp. Zool., vol. S, 

 1880 (type localities, off Guadeloupe, 150 fathoms; type in M. C. Z.). — 

 Bouvier, Bull. Soc. Philom. Paris, ser. 8, vol. 8, p. 56 [23], fig. 18-21, 1896.— 

 A. Milne Edwards and Bouvier, Mem. Mus. Comp. ZooL, vol. 27, p. 23, 

 pi. 3, fig. 5-15; pi. 4, fig. 1-4; text fig. 7, 8, 1902. 



Diagnosis. — Long spines predominate in dorsal aspect. Upper 

 margin of orbit sHghtly concave. A single smooth tubercle on fourth 

 and on fifth abdominal segment ; terminal segment triangular. 



» Op. cit., p. 240 [112]. 



