ADDITIONS AND EMENDATIONS TO UNITED STATES 

 NATIONAL MUSEUM BULLETIN NO. 112. 



By William H. Dall, 



Honorary Curator of Mollusks, United States National Museum. 



With the publication of United States National Museum Bulletin 

 112 containing a summary of the shell bearing mollusca of the 

 Northwest coast from San Diego northward, with their geographical 

 distribution so far as at that time determined, it was hoped that ad- 

 ditional information would be brought out, minor errors corrected, 

 and more light thrown on the whole subject. This has usually been 

 the case when such lists have heretofore been published, and it was 

 expected that the sequel to this one would prove no exception. 



This expectation has not been disappointed and a sufficient number 

 of data have accumulated to make desirable a brief supplement to the 

 bulletin in question. Should additional material come in later, a 

 second supplement may be added at some future time. Meanwhile I 

 desire to express my thanks to the correspondents who have kindly 

 furnished information herein presented, and to hope that their useful 

 collaboration may continue indefinitely. 



After the entire bulletin was in type and the proof read in 

 November, 1920, and immediate publication expected, a delay was 

 experienced, so that actual publication did not take place until 

 February, 1921. Consequently all names in the bulletin dated " Dall, 

 1920," should read " Dall, 1921." Other changes follow : 

 Page 10. Leda acuta, add "Also Atlantic." 

 Page 16. Barbatia solida, add " San Pedro, Chace." 



Section Acar, add : Barbatia reeveana Oi'bigny, Voy. Am. M^r., p. 635, 

 1846; Conch. Icon., Area, pi. 14. fig. 60, 1844; Balboa, Calif., Dr. 

 Tremper ; Mazatlan, Lowe ; south to Payta, Peru. Scapharca multi- 

 costata, add " Balboa, Calif. Dr, Tremper," 

 Page 17. Atrina oldroydi, add " San Onofre, Calif., White." 

 Page 18. Ostrea lurida, for " vol. 12 " read " vol. 13." 



After Pectinacea, insert " Family Pectinidae." 



No, 2478— Proceedings U. S. National Museum, Vol. 63, Art. 10. 



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