OF CONCHOLOGY. 191 



26. Helix Sayii, Binney, (Plate 12, figs. 5, 6, 7.) Two mu- 

 tilated specimens of monstrous size, found on Chilhowee Moun- 

 tains in Blount county, when presented to my notice seemed to 

 ■deserve to be regarded as a distinct species bearing the same re- 

 lations to IT. Sayii that H. major does to //. albolabris ; or as 

 H. Vancouverensis does to H concava. It was my intention to 

 propose these shells as a new species under the name Helix 

 Chilhoiveensis. They differ from typical H. Sayii in having a 

 cubic capacity more than five times as great, smaller or more 

 rudimentary teeth, a wider development of the reflected lip on 

 the base, and in several other less important details. The great- 

 est diameter of the most perfect shell before me is about 1.40 

 inches. Dr. Binney (Terr. Moll, ii., 187) says of M. Sayii — 

 *' Transverse diameter commonly less than one inch ; but there 

 are specimens in the Philadelphia Museum from Mr. Hyde's 

 collection, measuring one inch and three-quarters." This meas- 

 urement exceeds that of my shell, and very likely refers to spec- 

 imens indentical with it. Possibly the example of H. 7naJor may 

 afford naturalists an excuse for regarding the shell of Chilhowee 

 Mountains as distinct from H. Sayii. 



27. Helix spinosa, Lea. A somewhat common, but by no 

 means abundant species. 



28. Helix stenotrema, Fer. Common, but not abundant. 



29. Helix suppressa, Say. Less abundant than the preced- 

 ing. Hill sides. 



30. Helix thyroides, Say. Somewhat rare. 



31. Helix tridentata, Say. Found, not abundantly, in the 

 valley of the Holston. Largest diameter, according to W. G. 

 Binney, 16 mill. My largest shell measures 21 mill, excluding 

 the lip. 



32. Pupa armipera, Say. Found in the vicinity of Little 

 Kiver ? Smaller than Ohio shells. Rare. 



33. SucciNEA AVARA, Say. A small variety. Rare. 



