COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 91 



than left. Hinge J^ to % length of disk. Right valve with 17 to 21 

 rounded fasciculate ribs, often arranged in pairs ; riblets of fasciculi 

 minutely spinose when not worn smooth; interspaces as wide as ribs or 

 wider, with small riblets irregularly disposed ; fine punctate sculpture 

 covering disk. Anterior auricle moderately long, with 5 or 6 imbricated 

 riblets, wide fasciole, rounded byssal notch and ctenolium of 5 to 7 

 teeth; posterior auricle quite small, obliquely truncated, and with 7 

 or 8 oblique imbricated riblets. Left valve with fasciculated ribs more 

 angulated and usually more profusely spinose; interspaces of varying 

 width and with fine imbricated riblets irregularly disposed ; punctate 

 sculpture covering disk as in right valve; anterior auricle large, with 

 shallow byssal sinus, 9 to 11 imbricated riblets, and with small inter- 

 calary riblets often present ; posterior auricle same as that of right valve. 

 Color range including brown, red-brown, red, pink, orange and yellow; 

 interior of adult shells very glossy, with deep red-brown or red around 

 ventral margin and often red-brown, red or red-orange above; juveniles 

 having interior solid color, same as exterior. 



Reinarks'. This subspecies is distinguishable from Chlamys hastota 

 and C. hastata hericia by its rib-structure, sculpture of disk, obliquely 

 truncated posterior auricles and internal coloring; juveniles 12 mm in 

 height or less are only distinguishable by the punctate sculpture of the 

 disk. 



Geographical range: Hinchinbrook Island, Prince William Sound, 

 Alaska, to Newport Bay, California. 



Geochronological range : ?Pliocene ; Pleistocene, Recent. 



Bathymetric range: On rocks at minus tide, and in depths of to 

 40 fathoms. 



Ecological data : Found on rocks at minus tide, and in rocky, 

 sandy or muddy bottoms ; often associated with algae ; occasionally en- 

 cased in same species of sponge as Chlamys rubida (Hinds). 



Hancock Expeditions Collecting Stations: 

 SANTA BARBARA ISLANDS (southern California): 6 stations; 



12-50 fathoms, sand, mud. 

 OREGON: on shale reef at -1.6' tide, sta. 1489-42. 



Chlamys lowei (Hertlein) 1935 

 Plate 31 



Pecten (Chlamys) lowei Hertlein, 1935, p. 308, pi. 19, figs. 1,2, 7, 8. 

 "Gulf of California; Galapagos Islands. ?Catalina Island, Cali- 

 fornia." — Hertlein & Strong, 1946, p. 57. Carmen Island, Gulf 



