370 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



view. On the anterior margin of the merus of the outer maxilliped a 

 strong, depressed spine, pointing obliquely inward. Pterygostomian ridge 

 tuberculate. 



Chelipeds of male strong; arm tuberculate above, two blunt spines or 

 tubercles on inner margin and six of the same on outer margin; wrist 

 covered with low knobs, inner margin with a row of five knobs ; hands 

 elongate, arcuate above, concave below ; fingers moderately gaping, tips 

 with edges finely crenulate, a strong tooth near base of dactyl, edge of 

 fixed finger finely denticulate part way in the gape. Legs stout, three 

 principal articles tuberculate above, especially on margins; dactyls dark 

 colored for nearly a third of their length. 



Abdomen of male very wide, last segment with concave sides. 

 (Rathbun, 1925, modified) 



The young present such a different aspect from the adult that they 

 might easily be mistaken for another species. The carapace is narrower; 

 the width may be less than the length. The body and legs, but not the 

 chelae, are everywhere covered with a furry hair. The protuberances are 

 all sharp-pointed; the rostral horns curve toward each other; the pair 

 of spines at the base of the horns are nearly as long as the horns and are 

 divergent, while the next pair is very small. (Rathbun, 1907) 



Material examined: 76 specimens from 28 Galapagos Islands stations. 

 (See Garth, 1946) 



Measurements: Male: length 37.6 mm, width including lateral 

 spines 37.3 mm, without spines 34.8 mm, rostrum 3.8 mm, width 3.8 

 mm, cheliped 40.5 mm, chela 18.5 mm, dactyl 8.2 mm, height of palm 

 5.7 mm, ambulatory legs 40, 37.5, 33.5, and 27.5 mm, respectively. 

 Ovigerous female: length 53.7 mm, width including spines 56.6 mm, 

 cheliped 60.0 mm, chela 28.9 mm. Neither is as large as the 63.6 x 65.4 

 mm male measured by Rathbun (1902b). 



Color in life: See Garth (1946, p. 391). 



Habitat: In rock pools. (Rathbun, 1924b) Rocky shore. (Garth) 

 Young invariably sponge incrusted. (Garth) 



Depth: Intertidal. A single recovery by the Velero III from 5 fath- 

 oms lends credence to Bell's original record of 6 fathoms for the species. 



Size and sex: The series includes young from 4.6 mm, males from 

 11.1 to 37.6 mm, and females from 12.3 to 60.7 mm. Of these only the 

 53.7 mm specimen measured above was ovigerous. 



Breeding: The single ovigerous female was encountered by the 

 Velero III in the month of February. 



