ADDITIONS AND EMENDATIONS TO UNITED STATES 
NATIONAL MUSEUM BULLETIN NO. U2. 
By William H. Dall, 
Hmiorary 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 aeuta, acid “Also Atlantic.” 
Page 16. Barbatia solida, add “ San Pedro, Chace.” 
Section Aear, add : Barbatia reeveana Orbigny, Voy. Am. Mgr., p. 635, 
1846; Conch. Icon., Area, pi. 14. fig. 60, 1844; Balboa, Calif., Dr. 
Tremper ; Mazatlan, Lowe ; south to Payta, Peru. Scapharca multi- 
Gostata, 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. 
34975—23 
APR IR 1923 
issasr 
