394 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 



Measurements: Largest specimen, male: length 19.6 mm, width 16.6 

 mm, rostrum 3.9 mm, width 2.6 mm, cheliped 21.6 mm, chela 9.8 mm, 

 dactyl 4.5 mm, height of palm 3.2 mm, ambulatory legs ca. 22.1, 16.2, 

 15.0 and 12.5 mm, respectively. Female specimen: length 16.1 mm, width 

 12.6 mm. 



Color in life: Carapace plain tan to reddish brown ; chelipeds creamy 

 white above mottled with pink, or red marbled with white, a band of 

 bright red across base of fingers; under parts and ambulatories pale 

 cream, sometimes mottled with pink or red. (Crane, 1937) 



Habitat: Under stones at low tide. (Lockington) On sandy bottoms 

 with weed. (Crane, 1937) In tidepools and in Pocillopora coral. (Crane, 

 1947) Among rocks at foot of mangroves. (Steinbeck and Ricketts) 

 White sand and rock bottom. (Garth, 1946) Velero III specimens not 

 obtained intertidally on rocky shore were dredged on sand or coralline 

 bottom, or were cracked from coral heads. 



Depth: Shore to 13 fathoms. The lesser depth of 40 fathoms, rather 

 than the greater of 70 fathoms, should have been given as maximum for 

 the species in the Galapagos Islands (Garth, 1946, p. 405), since at 

 Tower Island the dredge was pulled outward from the shore at Darwin 

 Bay and dropped off immediately into deeper water. 



Size and sex: The present series contains young from 3.8 mm, males 

 from 5.7 to 19.6 mm, females from 5.4 to 16.5 mm, ovigerous females 

 from 11.0 to 16.5 mm. In the smallest specimen examined, a 4 mm 

 young, the lobe on the hepatic region is elliptical or crescentic and has 

 two minute spines pointing downward. In a 5.4 mm specimen the poste- 

 rior of these spines has disappeared. The anterior spine may persist in the 

 adult, where it becomes the most prominent feature of the collared lobe, 

 such supplementary projections as may be added to the upper margin 

 being secondary. The branchial lobe may have only its anterior margin 

 elevated, or it may be as distinctly rimmed as the hepatic lobe. The spine 

 between the two lobes at a lower level is a constant feature. A sharp 

 inner orbital ridge corresponding to the upper margin of the hepatic lobe 

 is present in a few specimens. When the branchial lobe is also imbricated, 

 the three structures present a remarkable sequence. The laminate crests 

 of the cheliped begin as a row of spinules in the 4 mm young. It is also 

 in the very young that the lobe on the outer margin of the basal antennal 

 article is most apparent. 



Breeding: Females with ova were found in the Gulf of California in 

 August by W. J. Fisher (Lockington), in April by the Zaca (Crane, 

 1937), from February to May by the Velero III, and in June by Wil- 



