HELIX. 



n 



submarginal line as in H. allernala, and terminating in a flattened, 

 broad, spade-like extremity like the Zonites. When in motion 

 none of the animal protrudes beyond the shell behind (looking 

 from above) — before there is but little visible, about as long as 

 the diameter of the last whirl ; the breadth of the animal before 

 the shell is about one-half the same diameter. 



Lingual membrane with 86 rows of 24 — 1 — 24 stout, short 



Fig. 13l. 



Liui'iKil deiituion of Helix ruinbij-linuUnnii. 



teeth each ; centrals with a triangular base surmounted by a 

 conical point ; laterals of same shape ; uncini bidentate. 



Cat. No. 



No.ofSp. 



Locality. 



Cumberland Mts. 



From whom received. 



Remarks. 



W. G. Binnev. 



Helix temiastriata, Binney. — Shell flattened, the upper surface 

 acutely carinated ; epidermis liglit liorn-color ; whirls seven, narrow, in- 

 creasing in width very gradually from the apex to the aperture; striated 

 with fine, prominent, distinctly separated, curved lines ; aperture angular, 

 depressed, contracted ; peristome ahove the carina acute, helow a little 

 reflected ; base suhconvex, smooth ; umbilicus open, moderate in size, 

 exhibiting two or three volutions. Greatest transverse diameter about 

 half an inch. 



Found hitherto only in the eastern part of Tennessee, whence a single 

 specimen was brought by Mr. Haldeman. This pretty species is described 

 with some reluctance from a single specimen, as it may be considered 

 doubtful until another be found, whether it may not be a foreign shell 

 introduced by mistake among Tenne.-isean shells. It is quite flat on the 

 upper surface, rising a little towards the apex ; the whirls, which are dis- 

 tinctly marked, are beautifully striated with delicate prominent curved 

 lines, which are crowded towards the apex, and separated by a distinct 

 interval on the outer whirl ; they terminate on the edge of the carina, 

 which is a little plaited by them, the base below being smooth. The 

 aperture is narrow, and marked by an angle at the carina. The lip below 

 the carina has a distinct, though narrow reflection. The umbilicus is 

 moderate, conical, and rather deep, exhibiting about three volutions. la 

 Lamarck's arrangement it would be a CarocoUa, 



