90 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



Geographical range: Gulf of Alaska to Santa Barbara, California. 

 (Records south of Santa Barbara doubtful.) 



Geochronological range: Pliocene, Pleistocene, Recent. 



Bathy metric range: Minus tide to 80 fathoms, possibly deeper. 



Ecological range: Found on rock, shale, sand or mud bottoms. 

 Shell usually encased in same species of symbiotic sponge as Chlamys 

 rubida ; barnacles frequently present on left valve, also of same species as 

 found on C. rubida. 



Chlamys hastata pugetensis (Oldroyd) 1920 



Plate 30 



Pecten islandicus pugetensis Oldroyd, 1920, p. 136, pi. 4, figs, 5, 6. 

 ". . . off San Juan Island, Puget Sound." 



Pecten (Chlamys) islandicus pugetensis Oldroyd. Dall, 1921, p. 19. 

 San Juan Island.— Oldroyd, 1924a, p. 55, pi. 12, figs. 4, 5. [Pre- 

 vious record cited.] 



Pecten (Pecten) hastatus Sowerby variety pugetensis Oldroyd. Grant & 

 Gale, 1931, p. 168. ?Middle Pliocene: southeast of Pico Canyon, 

 Los Angeles County. Living: Puget Sound. 



Pecten pugetensis Oldroyd. Gregg, 1938, p. 118. "Craig, Prince of 

 Wales Island, Alaska, to Newport Bay, Orange County, California. 

 I have fossil specimens, presumably Pliocene [Pleistocene], which 

 were taken at Deadman Island, San Pedro, California." 



Pecten islandicus pugetensis Oldroyd. Eyerdam, 1938, p. 125. "Hinchin- 

 brook Island, Alaska (coll. Norberg). Former range: San Juan 

 Island. Extended range: About 1000 miles northward." 



Pecten (Chlamys) hericius pugetensis Oldroyd. Proc. Conch. Club So. 

 California, 1944, no. 35, p. 5, figured on same page. Craig, Prince 

 of Wales Island, Alaska, to Newport Bay, Calif. (Gregg). 

 Holotype: Stanford University. 

 Type locality : San Juan Island, San Juan Group, Puget Sound, 



Washington. 



Original description: Shell much smaller than the typical C. 



islandicus. Sculpture coarser in proportion to the size. Shell more elong- 

 ate and the ribs spinose. Ribs 17, with a very fine one in the interspaces. 



Length, 29 ; height, 31 ; diameter 1 1 ; hinge line, 16 mm. 



Type locality off San Juan Island, Puget Sound. 12 specimens were 



obtained, two from the dredge, and ten from rocks on shore. 



Additional description: Shell rather small, averaging 33 mm in 



height ; higher than long and moderately convex, right valve more so 



