1888.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 379 



P.pusilla Mueller does not differ essentially from the species of Vertigo 

 except in being sinistral, and so it simply keeps its place among them. 



The following figures from the work of Mr. W. G. Binney may be of 

 use to collectors, though better ones, it is hoped, will in future be sup- 

 plied in a more extended discussion of the Pupidce; 



Fig. 



Fig. 2. 



Fig. 3. 



Fig. 5. 



Fig. 



Fig. 1. Vertigo gouldii. 



Fig. 2. Vertigo californica. 



Fig. 3. Vertigo roweUii. 



Fig. 4. Vertigo corpulenta. 



Fig. 4. 



Fig. 6. 



Fig. 5. Vertigo bollesicina, last whorl en- 

 larged. 

 Fig. 5a. Vertigo boJlesiana. 

 Fig. 6. Vertigo fioridana. 



Lastly, I venture to add the request that specimens of Pupa may 

 be forwarded to me. I shall be obliged for any and everything m 

 this line, even if sent for examination and determination only ; in the 

 latter case, the specimens will be promptly returned. The locality and 

 sender will in descriptions be conscientiously acknowledged in every 

 instance. 



EXPLANATION TO PLATE XLII. 



Diagrams exhibiting the arrangement of the lamella? of the aperture 

 in Vertigo : 



Fig. 1. Outline of the aperture and teeth of Vertigo antivertigo Draparnaud ; Eu- 

 ropean. 

 Fig. 2. Aperture of Vertigo pen todon Say ; American. 

 Fig. 3. Aperture of Vertigo gouldii Binney ; American. 



