284 



LAND AND FRESH-WATER SHELLS OP N. A. [PART I. 



where it passes upward, and joins that from the opposite side, 

 leaving posteriorly a flattened, rounded extremity, somewhat 

 prominent and glandular. Upon the centre of the extremity is 

 a longitudinal Bssure, or sinus, which is sometimes expanded, 

 and at other times closed and invisible. Secretion of mucus 

 from the extremity profuse. 



I have adopted Rafinesque's name Omplialina' for this sub- 

 genus, because the presence of the mucus pore requires a dis- 

 tinction between the following species and those of Mesompliix, 

 to which they are usually referred. Where the pore is not con- 

 sidered a generic distinction the species here grouped will be 

 considered as belonging to llesomjMx, a subgenus of Hyalina. 



Zonites kopnodes. 



Zonites kopnodes, W. G. Binn. — Shell depressed globos3, 

 wrinkled, below smooth ; spire short, depressed ; suture moderate ; whirls 



five, rapidly increasing, the last very 

 Fig. 507. ventricose and large, sometimes marked 



with coarse revolving lines ; aperture 

 large, round, peristome simple, acute, 

 ends approached, joined by a slight 

 deposition of brownish callus over the 

 parietal wall, reflected at the small and 

 deep umbilicus. Greater diam. 35, 

 lesser 28 ; height 13 mill. 



Helix lopnodes, W. G. Binney, Proc. 

 Acad, Nat. Sci. Philad. 1857, 186 ; Terr. Moll. IV, 104, pi. Ixxx, f. 

 14._Pfeiffek, Mon. Hel. Viv. IV, 346. 

 Eyalina kopnodes, Tkyon, Am. Journ. Conch. II, 248, pl. iv, f. 21 (1866). 



Found in Georgia, Alabama, and Tennessee in the Cumber- 

 land Mountains. 



A variety from Columbus, Georgia, and Franklin County, 

 Tennessee, is more de- 

 Fi<;. 508, pressed, and has longi- 



tudinal strife on the 

 upper surface like Z. 

 Isevigata (Fig. 508), 

 The lingual mem- 



_ Lingual dentition of 



Zonifes knpnndes. yar. brane IS Very brOad, Zonilea Tift], nodes. 



Fig. 509. 



' See p. 67 of ed. Binney and Tryon. 



