THE BARNACLES (CIIIHIPEDIA) CONTAINED IN THE 

 COLLECTIONS OF THE U. S. NATIONAL MUSEUM. 



By Henry A. Pilsbry, 



Special Oiiriilor of Ihe Jh'itarttnoil. of Mollusca, Acddemi/ of Xnlitrnl Sciences of PJiUn- 



(MpJiia. 



INTRODUCTION. 



The collection of Cirripedes in the United States National Museum 

 contains material derived from many sources. The most extensive 

 series was received from the United States Bureau of Fisheries, and 

 is due to the work of the steamers AlhatroKS and J^/'.sk /latc/i dur- 

 ing the past twenty-five years or more in both Atlantic and Pacific 

 waters. A considerable series of European forms was included in 

 the .Jeffrey's collection of mollusks purchased by the United States 

 National Museum, most of them preserved dry. Smaller accessions 

 from many localities, chiefly American, are the gifts of friends 

 of the Museum. From these- several sources a good representation of 

 the shore and pelagic forms of both Atlantic and Pacific coasts has 

 been obtained, with a rich though doubtless incomplete fauna of the 

 deep-water cirripedes of the east coast, and a much less complete col- 

 lection of those of the west. 



The present paper deals with the pedunculate cirripedes and tlic ses- 

 sile family Verrucida? only. All species represented in the National 

 Museum are mentioned or described, and incidentally all known 

 species of the United States and adjacent waters are treated mono- 

 graphicalh', though descriptive matter relating to well-known forms 

 is restricted to ke^^s for the determination of species." Up to this time 

 only about a dozen species of pedunculate cirripedes have been recorded 



"The i)resent paper should he used iu connection with the writer's reports on 

 Hawaiian and West American Cirripedes, Bulletin of the U. R. Fisii Commission, 

 XXVI, pp. 179-204, which also deal with material in the National Museum. 

 Species discussed in those reports are mentioned herein only when additional mate- 

 rial has come to hand. 



4715— Bull. 60—07 1 



