524 MICHIGAN SURVEY, 1905. 



UNAUTHENTICATED AND DOUBTFUL SPECIES. 

 POLYOYRA PALLIATA ALBA (Currier). 

 Listed, but without description, by Currier in his catalogue of 1868, where 

 it is stated that it is in "my cabinet." I have been entirely unsuccessful 

 in locating this form. It is not now in the Currier collection, which is in the 

 possession of the Kent Scientific Museum of Grand Rapids. Nor has it 

 been found by any of the other collectors of the state. 



POLYQYRA THYROIDES BUCCULENTA (Gld.) 



Cited by DeCamp. The citation from my own collection in my catalogue 

 of 1894 was based on specimens received from DeCamp so labeled and ac- 

 cepted without due care. All of DeCamp's specimens are now in my pos- 

 session and prove to be Polygyra alholabris maritima. The form must there- 

 fore be dropped as a member of our fauna. 



SUCCINEA HIQQINSI Bid. 



Judging from the original figure and description, it seems questionable 

 whether this is more than a dentate variety of S. retusa Lea. A similar 

 form of the European S. putris L. has been noticed by Baudon. No den- 

 tate specimens of Succinea from Michigan have been seen and the edentu- 

 lous form doubtfully referred in prior hsts to this species should be placed 

 elsewhere. It follows that the species should be dropped from the Michigan 

 list. 



SUCCINEA CAMPESTRIS Say. 



The obviously erroneous citation of this species by Sager and Miles was 

 caused, so Dr. Miles states in his report to the Census, by following Gould's 

 error, in the first edition of the Invertebrata of Massachusetts, of referring 

 S. ohliqua to campestris. 



SUCCINEA AUREA Lea. 



Cited by DeCamp, whose specimens, now in my possession, are young 

 retusa. 



PUPA DECORA Gld. 



Cited by DeCamp from Kent county, but his specimens proved to be the 

 types of a new species. Vertigo morsei Sterki. 



HELICELLA VIRQATA (DaCosta). 

 A single dead specimen of this species said to have been collected at Flint 

 was in the Lathrop collection (See Naut. VI, p. 125). 



VERTIGO PUSILLA Muller. 

 A specimen of this European species was recently dis- 

 covered in a vial of Cochlicopa luhrica from Lansing, sent 

 by Dr. Manly Miles to the Philadelphia Academy of Natural 

 Science more than thirty years ago. The vial had not 

 been opened during that time. As this species has never 

 been recorded from this country, it is in all probability a 

 stray specimen that was inadvertently mixed with the 

 Michigan shells. It is characterized by its sinistral shell 

 and peculiar arrangement of the apertural folds. The ac- 

 companying figure of the specimen in question made by 

 Mr. Vanatta will enable it to be identified should it ever 



Fig. 169. V. pusilla. 

 (Vanatta.) X22 . 



occur agam. 



