HELIX. 251 



shells, obsolete or diminished to a mere point in older 

 ones ; within the aperture on the outer lip, are one or 

 two lamelliform, elongated, nearly parallel teeth, one 

 near the base, the other more central. 



Greatest transverse diameter nearly three-eighths of 

 an mch. 



Geographical Distribution. The only localities I 

 am acquainted with which furnish this species, are East 

 Tennessee and North Alabama. Mr. Say records it as 

 found in Ohio and Pennsylvania, and it is placed upon the 

 catalogues of Dr. Kirtland and Dr. De Kay. I am 

 induced to suppose that they have, by error, taken Helix 

 suppressa, Say, to be the present species. 



Remarks. The identification of this species and of 

 IT. suppressa, Say, has long been a desideratum. Speci- 

 mens of a small shell, with a small and rounded, but pro- 

 found umbilicus, and with two internal teeth, exist in 

 almost every cabinet. In some particulars each resem- 

 ble ffelix gularis, Say, in others, Helix suppressa. Say ; 

 and as the resemblance preponderates in favor of one or 

 the other, they are known by one or the other name. 

 They do not, however, agree entirely with Mr. Say's 

 description of either ; and hence some conchologists have 

 supposed that he described from varieties only ; but I 

 have recently received specimens, collected by Mr. Hal- 

 deman in East Tennessee, which, as well as others in the 

 cabinets of Mr. Lea and Dr. Jay, correspond perfectly 

 with H. gularis. They are larger than the common speci- 



