THE NAUTILUS. 99 



Succinea avara Say. Limington, Bowcloinham, and V T eazie. 

 Succinea aurea Lea. Weils. 



Carychium exile canadense Cl. Sidney, Fairfield, Abbott, and 

 Monticello. 



Carychium exiguum Say. Bowdoinham, Old Town, and Winn. 



ANCYLUS OBSCURUS HALBEMAN AND SPECIES REFERRED TO IT. 



BY BRYANT WALKER. 



I. 



The available information down to 1903 in regard to Halde- 

 man's species was summarized in niy paper in the NAUTILUS, 

 XVII, p. 25. The re-discovery of A. obscurus by Goodrich in 

 1913 (NAUT., XXVII, p. 92) in the South Fork of the Powell 

 River at Big Stone Gap, Wise Co., Va., has enabled the specific 

 standing of that species to be definitely determined and given 

 a basis for comparison with other forms that have been referred 

 to it. 



Through the courtesy of Miss Crystal Thompson, the Curator 

 of the Amherst College Museum, I have been able to examine 

 all of the Ancylidx in the C. B. Adams collection. This 

 material with some other in mv own collection obtained from 



/ 



different sources has enabled me to come to conclusions, more 

 or less definite, in regard to the recorded citations of Halde- 

 man's species in Florida and the West Inclias. 



The doubt expressed by Bourguignat, Tryon and Clessin as 

 to the correctness of the West- Indian citations proves to be 

 fully justified. 



In the Adams collection are two lots labeled "A. obscurus? 

 Hald." These contain three very distinct species, none of 

 which is obscurv^. They will be considered separately. 



One of these, however, is identical with a set in my own col- 

 lection received as " A. ohscurus''' from Sowerby and Fulton 

 and these again are the same as a set in the MacAndrew collec- 

 tion labeled "A chittyi Ads." from Guadeloupe. The original 



