6 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 23 



Cyclopecten pernomus (Hertlein) : 330 miles north (in Gulf of 

 California only) ; 500 miles south; first records for the Gala- 

 pagos Islands and for Guadalupe Island, Mexico (180 miles 

 west of Lower California). 

 Chlamys lowei (Hertlein) : 130 miles north (in Gulf of California 

 only) ; 500 miles south; first conclusive record for Santa 

 Catalina Island, California. 

 Chlamys (Argopecten) circularis (Sowerby) : first Recent records 



for Galapagos Islands. 

 Chlamys (Leptopecten) latiaurata (Conrad) : first record for 



Gulf of California. 

 Chlamys (Leptopecten) velero biolleyi (Hertlein & Strong) : 800 



miles north and 700 miles south. 

 Pecten sericeus Hinds: 480 miles north and 500 miles south. 

 Pecten (Oppenheimopecten) vogdesi Arnold: 300 miles north. 

 The first two of the following extensions of range are based on 

 specimens in the present author's collection, the last three on Albatross 

 material in the U. S. National Museum. 



Cyclopecten (Delectopecten) vitreus (Gmelin) : first record for 

 Clipperton Island (670 miles off southwestern Mexico) ; 

 previously recorded in eastern Pacific only from off southern 

 Chile. 

 Chlamys (Leptopecten) velero (Hertlein) : 570 miles north. 

 Cyclopecten bistriatus (Dall) : 50 miles north and 880 miles south. 

 Cyclopecten liriope (Dall): first record from Galapagos Islands; 

 previously recorded only from type locality in Gulf of Pana- 

 ma. 

 Cyclopecten (Delectopecten) zacae (Hertlein) : 570 miles north. 

 Data: Although the most relevant data for those Hancock stations 

 cited are given in this paper, further data, such as latitudes, longitudes 

 and dates, can be found in the following volumes of the series of papers 

 published by the Hancock Foundation under the title Allan Hancock 

 Pacific Expeditions. 



Dredging stations: 1 through 23 and 1-33 through 1502-42: vol. 

 1, no. 3. Bottom samples (indicated by BS preceding station number) : 

 1 through 587: vol. 6, no. 1. 

 600 through 651 : vol. 6, no. 3. 

 652 through 667 : vol. 6, no. 4. 

 1001 through 1053: vol. 6, no. 1. 



