PART 1 GARTH : PACIFIC OXYRHYNCHA 255 



California Academy of Sciences material: One specimen from one 

 station. 



Hopkins Marine Station material : 32 specimens from 5 stations. 



Provincial Museum material: 8 specimens from 4 stations. 



From Bajo Point, Nootka Island, west coast of Vancouver Island, 

 British Columbia, to San Carlos Point, Lower California, Mexico. 



Measurements: Male specimen: length 46.5 mm, width 33.7 mm, 

 rostrum 10.5 mm, width 9.3 mm, cheliped 88 mm, chela 42 mm, dactyl 

 20.6 mm, ambulatory legs 55, 45, 41, and 37 mm, respectively. Female: 

 length 23.9 mm, width 15.9 mm. 



Color in life: Dull, usually gray or tan with more or less red on 

 chelipeds and walking legs. (Way) Dark red carapace, with lighter col- 

 ored bands on legs. Chelipeds bright red. (Hart, 1930) 



Habitat: Shallow water on rock at Parry Bay. (Hart, 1930) Pro- 

 tected outer coast; rocky shores; low-tide horizon, under rock. (Ricketts 

 and Calvin) Usually encrusted with bryozoans. (Way) The carapace of 

 larger specimens is usually covered with an encrustation of sponges, tuni- 

 cates, barnacles, etc. (Hart, 1940) 



Depth: Shore to 50 fathoms. The deeper record of 55 fathoms, San 

 Juan Islands (Way) is substantiated by a single dredging in 60-62 

 fathoms, San Juan Channel, by the Hydah. 



Size and sex: Aside from the 46.5 mm male measured above, the 

 Hancock series consists of young from 3.5 mm, males from 6.0 to 22.5 

 mm, and females from 6.5 to 23.9 mm, ovigerous females from 11.5 to 

 21.0 mm. Young of 5.5 mm are invariably characterized by an hepatic 

 spine of equal length to the postocular tooth, which has not yet assumed 

 its cup-shaped form and frequently presents a serrate anterior margin. 

 The resemblance to Pugettia dalli is remarkable ; however, in that species 

 the postocular tooth is always removed from the eye, whereas in Scyra 

 acutifrons it is adjacent to it. The young are proportionately more slender 

 than the adults and, with their greater spinulosity, suggest the young of 

 Mithrax (Mithrax) spinipes. 



Breeding: Ovigerous females were found off southern California in 

 every month but March, July, and September, in northern California in 

 March, and in Washington in July (Way) and August. A female from 

 Santa Rosa Island in April had pre-zoeae in the process of hatching. 

 Weymouth (1910) found egg-bearing females at Monterey in June. 



Remarks: The measured specimen, while not as large as the 52.6 

 mm male of which dimensions are given by Rathbun (1925, p. 196), is 

 so much larger than the balance of the Hancock series as to dwarf them 



