COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 93 



verifying the existence of Chlamys lowei off southern California, Han- 

 cock expeditions collections have extended the known range about 130 

 miles farther north in the Gulf of California (to San Felipe Bay), and 

 about 500 miles farther south along the coast of South America (to 

 La Plata, Ecuador). 



Geochronological range: Known only from the Recent. 

 Bathymetric range: Recorded in 1 to 80 fathoms. 

 Ecological data: Found in rocky, sandy or muddy bottoms; asso- 

 ciated with algae, kelp, bryozoa, coral, coralline and sponge. 



Hancock Expeditions Collecting Stations: 

 GALAPAGOS ISLANDS: 13 stations; 12-80 fathoms, rock, sand, 



coral, coralline, bryozoa, nullipores. 

 ECUADOR: La Plata Island; 7-10 fathoms, rock, nullipores, sta. 213- 



34. 

 COLOMBIA: Cape Corrientes, 10 fathoms, mud, sta. 231-34; Port 



Utria, 20 fathoms, rock, sand, mud, sta. 423-35. 

 PANAMA: Medidor Island, 30-35 fathoms, coarse sand, mud, sta. 244- 



35 ; Secas Islands, "shallow water," coral, sta. 447-35. 

 CLARION ISLAND, REVILLA GIGEDO ISLANDS, MEXICO: 



Sulphur Bay; 57 fathoms, nullipores, sta. 137-34. 

 GULF OF CALIFORNIA: 15 stations; Cape San Lucas to San 



Felipe Bay; 1-75 fathoms, rock, sand, coral, coralline, sponge. 

 WESTERN LOWER CALIFORNIA: 1 mile south of San Benito 



Islands; 44-49 fathoms, sand, coralline, sta. 1250-41. 

 SANTA CATALINA ISLAND, CALIFORNIA: White Cove; 16- 



35 fathoms, mud, algae, kelp, sta. 1155-40. 



Subgenus ARGOPEGTEN Monterosato 1889 



Argopecten Monterosato, 1889, p. 20. [Proposed as a subgenus of 

 Pecten.^ Type-species: Pecten commutatus Monterosato, 1875, p. 

 6. [nan Pecten solidulus Reeve, 1853, sp. 155 (pi. 33, fig. 155), 

 designated as type-species by Monterosato; see Remarks below. 

 Synonyms for P. commutatus are: Pecten Philippii Recluz, 1853, 

 p. 52, pi. 2, figs. 15, 16 (Sicily) ; non Pecten Philippii Michelotti, 

 1839, p. 11, no. 7 (Pliocene of Lombardo-Veneta, Italy) ; Pecten 

 atlanticus E. A. Smith, 1890, p. 306, pi. 22, figs. 9, 9a, 9b (St. 

 Helena Island). Geographical range of commutatus: western 

 Atlantic, from Bay of Biscay to St. Helena Island; Mediterranean: 

 Spain, France, western Sicily, Tunisia, Algeria, Spanish Morocco; 

 ?Adriatic.] 



