110 PROCEEDINGS OP THE ACADEMY OP 



found among other shells. This class of shells is apparently scarce 

 in the regions explored. 



Ancylus Haldemani, Bourgy. ? 



Ilolston River. No specific name was suggested for this shell 

 in my previous paper. It may possibly be A. obscurus, Hald.; if 

 so, the two names are probably synoii3'ms. 



4 



LAND SHELLS. 

 Helix arborea, Say. 



Blount and Monroe Counties. Very scarce. 

 Helix clausa, Say. 



Blount County. Among forty specimens was one having all 

 the features of H. 3Iitchelliana, Lea. 



Helix demissa, Binney. 



The typical form is scarce. The few I have secured are small 

 and pale. The larger shell of this group, which in my previous 

 paper I treated as a variety of ligera, is proportionally a little 

 more elevated and decidedly yellow. Mr. W. G. Binney, I am in- 

 formed, regards it as a variety of demissa. It is apparently as 

 distinct from the typical demissa as sculptiliss, Bland, is from in- 

 dentata Sa}\ This consideration induces me to reclaim for the 

 larger shell the name acerra, hesitatingly suggested in my previous 

 paper. I have a single specimen in no respect distinguishable 

 from the typical demissa except by two teeth, within, as in 

 gularis. 



Helix gularis, Say. 



In my endeavors to find young specimens of this species among 

 the numerous shells sent b} r Miss Law, I am constrained to regard 

 as such the small depressed shells which in my former paper I re- 

 ferred to suppressa. The shells hitherto regarded as suppressa 

 differ so essentially from undoubted specimens of that species from 

 Pennsylvania that I cannot unite them. Among the shells of this 

 type from Miss Law appear to be three varieties of gularis differ- 

 ing in size, form, and elevation. A fourth form is more polished 

 and subglobose, with the umbilicus entirely closed. It may be 

 hereafter separated as a distinct species. 



Helix hirsuta, Say. 



A common species accidentally omitted in former papers. 



