308 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Color in life: Carapace light bluish gray. Chelae dusky dark brown, 

 fingers white. (Petersen) 



Habitat: Rocky shore; occasionally obtained from coral. 



Depth: Intertidal. To six fathoms. (Bell) 



Size and sex: Males are from 3.6 to 15.7 mm, females from 5.1 to 

 15.4 mm, ovigerous females from 7.4 to 14.5 mm. 



Breeding: Ovigerous females were encountered by the Velero III 

 in December, January, and February. Young to 1.5 mm are present. 



Remarks: The similarity of this species and Herbstia camptacantha 

 Stimpson, noted by Hult (1938) in connection with a 13 mm male 

 having three external antennal spines instead of the two customary for 

 H. edzvardsi, is borne out by pleopod studies which show them to be 

 more closely related than are any two mainland species and indicate the 

 probable origin of the Galapagos form. 



Herbstia pubescens Stimpson 

 Plate S, Fig. 7; Plate 34, Fig. 3 



Herbstia pubescens Stimpson, 1871a, p. 92. A. Milne Edwards, 1875, 

 p. 76. Miers, 1886, p. 49. Rathbun, 1925, p. 302. Garth, 1948, p. 

 27. 



Type: Female holotype, length 21.6 mm, width 17 mm, originally 

 in the collections of the Smithsonian Institution, no longer extant. 



Type locality: Manzanillo, Mexico; John Xantus, collector. 



Localities subsequently reported, with collectors: Panama: Guayabo 

 Chiquito; Colombia: Gorgona Island; Ecuador: La Plata Island; all 

 by the Askoy (Garth). 



Atlantic analogue: None. A Panamic species with Galapagan affin- 

 ities. 



Diagnosis: Rostrum short. Ambulatory legs without spines. Lateral 

 marginal spinules numerous. A transverse ridge on genital region. Spin- 

 ules on superior border of palm lacking in females and young males, 

 obsolescent in adult males. Male first pleopod notched at level of spermi- 

 ducal opening. 



Description: Carapace subpyriform, depressed, regions indicated, 

 medially tuberculate, laterally spinulous, posteriorly produced, and cov- 

 ered with short pubescence. Rostrum short, horns broadly triangular, 

 basal width of each exceeding length, tips curving slightly inward, median 

 interspace equal to one horn inverted. Inner superior margins of orbits 

 but little convergent anteriorly, a sharp preorbital spine; outer orbital 

 spine, together with the broadly arching interorbital tooth, forming a 



