276 RATHBUN 



orbit deeper; surface very finely granulate, and with small punctas 

 rather distant from one another. Front very broadly rounded, its 

 w^idth at base exceeding one third the distance between the anterior 

 angles, and also exceeding the width of the eyebrow, or surface be- 

 tween the orbit and the anterior margin of the carapace. Antero- 

 lateral angles blunt, almost a right angle ; the width between them be- 

 ing slightly less than the width of the carapace a little behind that point. 

 Carapace broad behind, as compared with other species of the genus. 



Larger cheliped with merus and carpus elongate, outer surface 

 rugose, inner margin tuberculous. Palm with outer surface densely 

 tuberculous, the tubercles coarse above, diminishing from above down- 

 wards ; surface bent over superiorly to almost a horizontal position, 

 and with a sulcus subparallel to the superior margin. This margin is 

 marked by a raised line of tubercles. The inner surface of the palm 

 has a very prominent oblique ridge extending from the lower margin 

 upward and backward to a point above the middle, then turning dis- 

 tally until it joins a curved ridge which originates at the upper margin 

 near the carpus ; the oblique ridge is marked by a line of tubercles. 

 A double row of depressed tubercles at the base of the dactylus. 

 Space between this row and the oblique ridge in part finely granulous. 

 Pollex almost straight ; its prehensile tubercles in general increasing 

 in size distally. Dactylus strongly curved, reaching when closed, be- 

 yond and below the pollex ; only an occasional tubercle equaling those 

 of the pollex. Outer surface of fingers finely granulate. 



Ambulatory legs with meral joints of first three pairs dilated, those 

 of the third pair about two and a half times as long as wide, those of 

 the last pair with subparallel margins. Remaining joints slender. 

 Legs long-hairy. 



Dintensions. — Male, length 13.6 mm., anterior width 19.5, greatest 

 width 19.8, width between posterior pair of legs 10, greatest posterior 

 width (inferior) 16.5, length of propodus of large cheliped 35, length 

 of dactylus 24.9, width of propodus 12. 



Type Locality. — Indefatigable Island, Galapagos, April 12, 18S8, 

 U. S. Fish Commission steainer Albatross., 6 males (U. S. Nat. 

 Museum Cat. No. 22319). 



Additional Localities. — Nine small specimens, 6 male and 3 female, 

 were taken by the Hopkins Stanford Expedition at South Seymour 

 Island, near Indefatigable Island. James Island, April 11, 1888, i 

 male, Albatross. 



This species is readily distinguished by the very convex and smooth 

 appearance of the carapace, the great width of the front, the character 



