OXTSTOMATOUS AND ALLIED CRABS OF AMERICA 'J I 



spine. A small protogastric spine. The carapace is convex trans- 

 versely and has no dorsolateral margin; it is covered with fine sub- 

 acute granules, and on its anterior half with straight hairs some of 

 which are long and recurved. There is no trace of an orbital cavity, 

 the vertical region in its place extending from the basal rostral spine 

 to the antennal spine. Ocular peduncles stout, constricted at mid- 

 dle; cornea occupying nearly one-third of its length. Basal article of 

 antennular peduncle dilated at proximal end, two next articles 

 slender, subequal, the base of the last one not reaching extremity of 

 rostrum; the longer flagellum is nearly as long as the last article of the 

 peduncle. The antennal flagellum is a little longer than carapace. 



Figure 17. —Homologenus rostratus: Ventral view of anterior portion, enlarged. After A. Milne Edwards. 



Chelipeds of moderate size, not longer than carapace, spinous and 

 finely hairy; propodus armed with six or seven spines below, fewer 

 above; carpus 8-spined; fingers deflexed, unarmed, occludent margins 

 in contact. First three pairs of ambulatories very long, extremely 

 slender and almost cylindrical; nierus with a few spines above, in- 

 cluding a terminal one, and some shorter spines below. Fourth pair 

 slenderer and much shorter; its propodus has, not far from its base, 

 a long spine directed distad within which the dactyl plays. Male 

 abdomen oval; in male and female a strong spine on second and 

 third segments; a pair of small, lateral spines on segments 3, 4, and 

 5 in male. 



Color. — Vinaceous-pink. 



Measurements. — Female (11389), length of carapace to tip of 

 rostrum 15.6; mdth exclusive of spines 10.7, length of second ambu- 

 latory 32.6 mm. 



Range. — Eastern Atlantic; Bahamas to Leeward Islands; 580 to 

 683 fathoms. 



Material examined. — See table 20, page 72. 



