PART 1 GARTH : PACIFIC OXYRHYNCHA 429 



bisulcate longitudinally by blunt ridges and armed along superior margin 

 with a series of strong, short spines not concealed by the thick hair ; the 

 proximal spine of the row out of line and situated on the posterior sur- 

 face instead of on the margin and a conspicuous feature in the legs of the 

 first three pairs ; lower limb of merus narrower than in T. puella and 

 with thickened margin ; both margins fringed with hair. Superior margin 

 of carpus thick, arcuate, inferior margin unilobate. (Rathbun, 1925, 

 modified) 



Material examined: 143 specimens from 37 stations. (See Table 91) 

 From Puerto Refugio, Angel de la Guarda Island, Gulf of California, 

 and Puerto San Carlos, Sonora, to Tangola Tangola Bay, Oaxaca, 

 Mexico; Clarion and Socorro Islands, Revilla Gigedo Islands. 



Measurements: Largest specimen, male: length 15.8 mm, width 

 15.3 mm, rostrum 1.8 mm, width 2.0 mm, cheliped 22.3 mm, chela 12.0 

 mm, dactyl 6.5 mm, height of palm 4.7 mm, of gape 1.6 mm, ambula- 

 tory legs 17.4, 14.7, 12.5, and 10.9 mm, respectively. Largest female: 

 length 13.1 mm, width 11.5 mm. 



Color in life: See color notes for the subspecies, Thoe sulcata 

 panamensis. 



Habitat: In coral (Pocillopora ligulata). (Crane) On sponge mass 

 below 0.0' tide level. (Steinbeck and Ricketts) Eight of the 36 Velero 

 stations were coral, with 24 stations ordinary rocky shore collecting at 

 low tide. Serpulids. 



Depth: To 2.5 fathoms. (Crane, 1937) Apart from recoveries from 

 coral, all Hancock expeditions specimens were obtained intertidally. 



Size and sex: Males are from 4.5 to 16.0 mm, females from 4.7 to 

 13.8 mm, ovigerous females from 8.5 to 13.8 mm, and young from 3.6 

 mm. The smallest specimens were cracked from coral and resemble 

 Hemus in the lamellate extension of the inferior margins of the meri of 

 the walking legs. 



Breeding: Ovigerous females were encountered by the Velero III 

 in the Gulf of California in March, at Clarion Island in January and 

 March, and off southern Mexico (Oaxaca) in March, and by William 

 N. Smith II at Tiburon Island in June. 



Remarks: The Hancock series of Thoe contains an even more 

 impressive array of specimens than the 28 plus 67 obtained by the Zaca 

 on which Crane (1947, p. 71) based her reduction of T. panamensis 

 Nobili to a subspecies of T. sulcata Stimpson. Included are specimens 

 from critical areas, such as the Gulf of Tehuantepec (Tangola Tangola) , 

 not represented in the Zaca collections. However, the additional evidence 



