THE NAUTILUS. 



is frequently present, as also a minute angular lamella, 

 teeth are porcelain-white in color. 



49 



All the 



1-6, VERTIGO MODE3TA MICROPHASMA. 7, VERTIGO ALLYNIANA. 



8, V. A. XENOS. 



Length of type 2.6; diameter to lip edge 1.5; length of aper- 

 ture 0.9 mm. ; whorls 5. 



Type: Cat. No. 2740 of the writer's collection. Paratypes in 

 the Academy of Natural Sciences of Philadelphia, California 

 Academy of Sciences, Southwest Museum, United States 

 National Museum, and the private collections of Mr. George H. 

 Clapp and others. 



