PART 1 GARTH : PACIFIC OXYRHYNCHA 285 



In the female the rostrum shorter, one-third length of remainder of 

 carapace ; the cheliped equaling length of carapace and half the rostrum ; 

 the fingers relatively longer than in the male ; first pair of ambulatories 

 one and one-fifth times as long as carapace and rostrum. (Rathbun, 

 1907, modified) 



In an amended description Rathbun (1925) increased the number of 

 carapace spines to twenty, the extra pair being on the branchial region, 

 and removed the posterior of three spines in line from the basal antennal 

 article, as in the diagnosis above. The edges of the fingers are crenulate. 



Material examined: 5 specimens from 3 stations. (See Table 58) 

 From 5 miles south of San Benito Islands to San Jaime Bank, off Cape 

 San Lucas, Lower California, Mexico. 



Measurements: Largest specimen, male: length including rostral 

 spines 19.6 mm, width including branchial spines 13.3 mm, rostrum 5.2 

 mm, narrowest width 2.3 mm, cheliped 19.2 mm, chela 9.0 mm, dactyl 

 4.4 mm, ambulatory legs 27, 23, 20, and 19 mm, respectively. Female: 

 length 11.1 mm, width 7.1 mm. 



Color in life: Not recorded. 



Habitat: Rocky bottom. (Crane) The three stations from which 

 Hancock expeditions specimens were recovered had bottoms of rock, sand, 

 and coralline. 



Depth: 40 fathoms (Crane) to 300 fathoms. Velero specimens are 

 from 52-97 fathoms only. 



Size and sex: It is thought that all known specimens, including the 

 20.7 mm holotype, are young, since specimens of related species attain the 

 following dimensions: Rochinia crassa (Atlantic) 95 mm, R. histrix 

 (Atlantic) 41.5 mm, R. cornuta (Pacific) 50.2 mm, and R. occidentalis 

 (Pacific) 57 mm. 



Breeding: Ovigerous females of the species are unknown. 



Remarks: Although Rochinia vesicularis was originally described 

 from the Galapagos Islands, there can be no doubt that specimens taken 

 off Lower California by the Velero III and IV and in the Gulf of Cali- 

 fornia by the Zaca are this species. The male from San Benito Islands, 

 station 1119-40, was compared with the type in the collection of the 

 U. S. National Museum and agrees in every particular. 



The 18.6 mm male from San Jaime Bank, station 618-37, has the 

 requisite number of carapace spines, but some have been broken off at 

 their bases. In addition to the 20 dorsal spines, there are 4 pairs of lateral 

 spines, 3 of which are subbranchial, 1 subhepatic. 



