OF CONCHOLOGY. 



189 



a diameter of nearly one-third of an inch, and a fraction over 

 seven whorls. Dr. Binney and W. G. Binney ascribe to cajjsella 

 a diameter of one-fifth of an inch and a fraction over six 

 ■whorls. Notwithstanding the discrepancy, I am constrained for 

 the present to regard my shells as being possibly a variety of 

 capsella. Dr. Gould's shells were probablv immature. 



Helix concava, Say. A not very abundant species. Found 

 mostly in the valley of the Holston. My largest specimen is 

 0.81 inch in diameter. The shells of this species from near 

 Concord are remarkable for their large size. 



7. Helix demissa, Binney. 



8. Helix Downteana, Bland. About a dozen specimens in 

 all were at various times taken from under a log near Philadel- 

 phia, Monroe county. Not found elsewhere. 



9. Helix elevata, Say. A very abundant species. 

 Banded specimens are not uncommon. 



10. Helix exoleta, Binney. Rare, 



11. Helix FALLAX, Say. Abundant in the hilly regions of 

 Monroe county. 



12. H. FULIGINOSA, Griffith. Found in Blount county, and 

 near Concord. Rare. My largest specimen is nearly \\ inch 

 in diameter (= 31| mill.) Mr. W. G. Binney ascribes the diam- 

 eter 26 mill, to this species. 



13. Helix gularis, Say. A very abundant species. 



14. Helix Hazardi, Bland. A rare species; less abundant 

 than H. spinosa, Lea. 



15. Helix interna, Say. A somewhat rare species. 



16. Helix intertexta, Binney. A somewhat rare species, 

 not so fully developed as in Ohio and New York. 



17. Helix introferens, Bland. A single specimen mingled 

 with a. Mugeli, the larger specimens of which it resembles in 

 form, size and color, is all I have. It has a more constricted 

 aperture than Rugeli ; the umbilicus is wide at the termination 

 of the last whorl, but more contracted within than in small speci- 

 mens of H. fallax of about the same size. I find only a faint 

 callous thickening on the pillar lip within and near the margin 

 of the aperture by exploring it with a small tenaculum. Greater 

 diameter (excluding the reflected lip) 12 mill. =0.46 inch. This 

 is less than is given in W. G. Binney 's " Land and Fresh Water 

 Shells," but much greater than I find in doubtful specimens sent 

 to me by other correspondents. 



