PART 1 GARTH : PACIFIC OXYRHYNCHA 93 



one-half their length. Ambulatory legs decreasing regularly in length 

 from the first to the fourth; fourth pair a little more than one-half the 

 length of the first. (Rathbun, 1893b) 



Female: Carapace with two median spines, one on the posterior part 

 of the gastric region and one on the cardiac region. Two spines on each 

 branchial region and, almost in line with these, one on each protogastric 

 lobe. Lateral margins spinulous. Surface pubescent. Rostrum slen- 

 der, spinulous on the margins, curving upwards for its distal half. A 

 prominent supraorbital spine. The first article of the abdomen carrying 

 a spine; the second article, one much smaller. Basal antennal [article] 

 very long and narrow, terminating in a spine, spinulous on the margins, 

 without a prominent tubercle. Chelipeds very weak; margins of merus 

 spinulous ; a slender spine above near the carpus ; hand granulous ; 

 fingers nearly as long as palm, in contact. Ambulatory legs slender, 

 pubescent, decreasing in length but little from the first to the fourth 

 pair; dactyls spinulous below. (Rathbun, 1893b, modified, of Anasimus 

 rostratus) 



The length of the rostrum is subject to considerable variation. The 

 11 mm specimen measured above has a well-developed rostrum of 3.6 

 mm, but an individual from station 1271-41, also a male, measuring but 

 9.1 mm in length, has a 3.6 mm rostrum also. It is a particularly 

 spinulous individual, and the tip of the rostrum is bispinate. The females 

 of the species, with their shorter rostrum and shorter legs, are difficult 

 to tell from females of Inachoides laevis. Fortunately the ranges of the 

 two species are well delimited on the open Pacific coast, although they 

 overlap in the Gulf of California. 



Material examined: A total of 1,551 specimens from 156 stations. 

 (See Table 12) From San Miguel Island and Point Santa Barbara, 

 California, to Magdalena Bay, Lower California, and from Rocky Point, 

 Sonora, to Gorda Bank in the Gulf of California. Extralimital : Panama. 



Measurements: Largest specimen, a male, length 11.0 mm, width 

 6.8 mm, rostrum 3.6 mm, cheliped 35.4 mm, merus 13.6 mm, chela 

 16.6 mm, dactyl 3.9 mm, legs 23.3, 17.2, 15.5, and 13.5 mm, respectively. 

 Ovigerous female: length 5.7 mm, width 4.0 mm. 



Color in life: Not noted. In alcohol, chelipeds and legs conspicuously 

 banded and marbled. (Crane) 



Habitat: Analysis of the 130 stations at which Erileptus spinosus 

 was taken for which data on bottom type are available reveals a primary 

 breakdown as follows : sand 55 per cent, mud 20 per cent, rock 20 per 

 ccnc, coral and coralline 5 per cent. The secondary breakdown reveals 



