$1.00 per Year. ($1.12 to Foreign Countries.) 10 cts. a copy. 



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. XII. 



DECEMBER, 1898. 



No. 8. 



CONTENTS: 



PAGE 



DESCRIPTIONS OF NEW SPECIES AND VARIETIES OF AMERICAN ZONI- 



TID^; AND ENDODONTID^:. By Henry A. Pilsbry, . . .85 



ANODONTA IMBECILLIS, HERMAPHRODITIC. By Dr. V. Sterki, . 87 



SAN DIEGO, CALIFORNIA, AS A COLLECTING GROUND. By F. W. Kelsey, 88 



NEW SPECIES OF BIFIDARIA. By Dr. V. Sterki, . . 90 

 NOTE ON THE GENERIC NAMES OF Two GROUPS OF ACHATINID/E. 



By C. F. Ancey, 92 



A NEW UNIO FROM TEXAS. By Berlin H. Wright, . . 93 



RECENT PUBLICATIONS RECEIVED, . . 93 



NOTES AND NEWS, . . 95 



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-Office as second-class matter. 



