168 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Chelipeds: arms cylindrical, very long, smooth, with some small 

 tubercles at the base; carpus [not carapace] bearing a crest on its external 

 surface; hand nearly as long as the carapace, smooth, compressed; its 

 margins sharp-edged ; ringers short, leaving a gap between them at the 

 base ; the extremity of the fingers toothed at their external margin ; the 

 movable finger bearing at its base a sharp tubercle. Legs slender, long, 

 dactyli arched and pointed at their extremities, with stiff hairs at their 

 internal margin; propodi compressed; carpi nearly depressed, channeled 

 on their internal surface. 



Abdomen of seven [not five] articles; the penultimate long, and 

 carrying at each side a small tubercle. (Saussure, modernized as to 

 terminology) 



Material examined: 84 specimens from 30 stations. (See Table 28) 

 From Scammon Lagoon, west coast of Lower California, and Tepoca 

 Bay, Gulf of California, Mexico, to Taboga Island, Panama. San Jose 

 Island, Gulf of California, Mexico, California Academy of Sciences, 

 1921 expedition, 1 male. 



Measurements: Male: length 18.7 mm, width including spines 19.0 

 mm, width without spines 16.0 mm, rostrum 1.4 mm, width 2.6 mm, 

 cheliped 16.8 mm, chela 7.4 mm, dactyl 3.2 mm, height of palm 2.4 

 mm, ambulatory legs 16.4, 16.0, 15.0, and 13.8 mm, respectively. Largest 

 specimen, male: length 22.1 mm, width including spines 20.1 mm, with- 

 out spines 18.0 mm. Female: length 21.7 mm, width including spines 

 19.4 mm, width without spines 17.8 mm. 



Color in life: Whitish. (Saussure) Carapace ochraceous buff except 

 for a large patch of dark brown on either side of intestinal region; 

 marginal teeth purplish ; orbital teeth white ; hairs set in sockets of Beryl 

 green. Cornea light brown, eyestalk ivory. Chelipeds mottled dark yellow- 

 green and white; fingers dark green proximally, warm buff distally. 

 Ambulatory legs with meri cream buff encircled with a yellow-green 

 band; carpi, propodi, and dactyli yellow-green proximally, cream buff 

 distally. Pterygostomian region and outer maxillipeds mottled dark green 

 and white. Abdomen and sternum red-orange and white. (Petersen, of a 

 female from the Gulf of California) 



Habitat: Sandy beach with scattered rocks at extreme low tide. 

 (Boone) Under a stone in three feet of water, decorated with large 

 grains of sand and bits of shell and weed. (Crane) Of the 26 recoveries 

 for which data on substratum are available, 7 are from rock (presumably 

 the 7 shore stations), 10 from sand, 4 from sandy mud, and 7 from 

 organic bottom (coral, nullipore, coralline). 



