COMPLETE GRAU : PECTINIDAE OF THE EASTERN PACIFIC 5 



Since they have been corroborated, all references in this paper can 

 be relied upon except, of course, any that may have become the victims 

 of undetected typographical errors. 



In conclusion the author wishes to quote a remark which seemed 

 singularly apropos at the time this paper was completed. Philip P. Car- 

 penter prepared a report on the mollusks of the west coast of North 

 America for the 1856 meeting of the British Association for the Ad- 

 vancement of Science, and in the opening section of the report he com- 

 mented, "As human life is so short, and those who have the inclination 

 for scientific pursuits have generally so little leisure, it is a serious evil 

 when so large a proportion of that little has to be devoted to the labour 

 of making out the errors of predecessors." The author agrees, but as an 

 observation rather than a complaint, with due regard for the accomplish- 

 ments of his predecessors, and with the hope that future workers will 

 not too often find the necessity for "making out the errors" in the fol- 

 lowing pages. 



HANCOCK PACIFIC EXPEDITIONS RESULTS 



Intensive collecting in the eastern Pacific by the Hancock expeditions 

 has contributed greatly to our knowledge of the Pectinidae native to the 

 region. Twenty-six of the previously described species were found, many 

 of them represented by series illustrating stages of growth, ecological and 

 individual variations, geographical range and bathjTnetric range. 



The seven new species described in this paper are listed below. Ex- 

 tensions of geographical range were established for eight species, and are 

 listed in approximate mileages ; four other extensions of range were 

 based on material not collected by the Hancock expeditions, and they are 

 listed after the above nine. 

 New Species: 



Cyclopecten benthalis (southern California) 



Cyclopecten zephyrus (southern California) 



Cyclopecten acutus (western Colombia) 



Cyclopecten exquisitus (Galapagos Islands; Callao, Peru, to north- 

 ern Gulf of California) 



Cyclopecten barbarensis (southern California) 



Pecten (Oppenheimopecten) galapagensis (Galapagos Islands) 



Pecten (Oppenheimopecten) hancocki (Cocos Island, Costa Rica) 

 Extensions of Geographical Range : 



Cyclopecten catalinensis (Willett) : 45 miles north; first records 

 for Gulf of California. 



