$1.00 per Year. ($1.12 to Foreign Countries.) lOcts. a copy. 



Jl,l/if THE 



NAUTILUS 



A MONTHLY 



DEVOTED TO THE INTERESTS 



OF CONCHOLOGISTS. 



EDITOR: 

 H. A. PiLSBRY, Conservator Conchological Section, Academy of Natural Sciences, Philadelphia. 



ASSOCIATE EDITOR : 

 C. W. Johnson, Curator of the Wagner Free Institute of Science. 



Vol. VII. JULY, 1893. No. 3. 



CONTENTS: 



PAGE. 

 To CONCHOLOGISTS 25 



BuLiMULUs PROTEUS Broderip and its Distribution. W. H. Dall. ... 26 

 Edible Mollusks of Southern California. Mrs. M. Burton Williamson, 



University, Los Angeles Co., Cal 27 



On A New Species of Yoldia from California. W. H. Dall 29 



Notes on the Genera of Unionid.^ and Mutelid^. H. A. Pilsbry. . 30 

 Notes on the Acanthochitid,^ with Descriptions of New American 



Species. Henry A. Pilsbry 31 



MoLLUscA of Arkansas. F. A. Sampson, Sedalia, Mo 33 



Notes and News 35 



Exchanges 36 



Published by 



H. A. PILSBRY, Editor, Academy of Nat. Sciences, Philadelphia. 



C. W. JOHNSON, Manager, Wagner Free Institute of Science, Philad'a. 



Entered at Philadelphia Post-OfSce as second-class matter. 



