8G 



24. Vertigo ovata, Say. 



25. " simplex, Gould, sp. 



26. Ferussact'a suhcylindrica, Linn. sp. 



27. Succinea rusticana, Gould. 



28. " Nuttalliana, Lea. 



29. " Oo'egonerisis, Lea. 



30. OnchideUa Garpenteri, W. G. Binney. 

 3L '•' horealis, Dall. 



32. Carycldum exigtmm, Say, sp. 



In the foregoing list several species will be recognized as common 

 European forms, namely, Limax agrestis, Conulas fulvus, Fervssacicv 

 subcylindrica, and in the opinion of some conchologists the following 

 American and European species are also identical : — 



AMERICAN. EUROPEAN. 



Microphysa minutissima, Lea, = pygmoea, Drap. 



Vertigo ovata, Say, = antivertigo, Drap. 



" simplex, Say, = edentula, Drap. 



Oarycliium exiguum, Say, = minimum, Miill. 



As, however, there is a little uncertainty on these points, I prefer 

 for the present to use the earliest American names. 



The seven species just mentioned occur also in the eastern parts of 

 Canada, and with the five following find a place in the Ottawa lists : 

 Hyalina arhorea, Hyalina milium, Hyalina Binneyana, Patula stri- 

 atella, Patula asteriscus. There are thus twelve species out of thirty- 

 two common to Ottawa and Vancouver Island. The remaining twenty 

 species are all purely western forms, with the single exception of 

 Pupilla corptdenta, which is recorded from Nevada and Colorado. 



