216 A MANUAL OF AMEKICAN LAND SHELLS. 



Z. intertextm (Terr. Moll., V, Plate II, Fig. L) has about 61-1-61 teeth 

 on its lingual membrane; there are 12 j)erfect laterals. Another 

 specimen has 45-1-55, with 12 laterals. 



Zoiiitcs subplaniis, Binkey. 



Shell flattened, planulate above and beneath ; epidermis brownish or 

 smoky horn color, shining ; whorls 5i, those nearest the 

 apex striated transversely with very minute and delicate 

 wrinkles; suture distinct, not much impressed; aperture 

 transverse, not expanded, the plane of the aperture mak- 

 ing nearly a right angle with the plane of the base of the 

 shell ; peristome simple, thin, acute ; base flattened, um- 

 bilical region a little impressed ; umbilicus small, round, 



zonites subpianus. ^nd dccp, uot exhibiting the volutions. Greater diameter 



20, lesser 16°^'" ; height, 6'°'". 



Helix suhplana, Binney, Bost. Journ. Nat. Hist., iv, part i, cover, p. 3 (1842) ; iv, 

 241 (1842) ; Terr. Moll., ii, 229, pi. xxxiii.— Pfeiffer, Mon, Hel. Viv., i, 112.— 

 W. G. BiNNEY, Terr. Moll., iv, 110. 



JTi/alina suhi^lana, Tryon, Am. Jouru. Conch., ii, 250 (1866). 



Zonites subpianus, W. G. Binney, L. & Fr.-W. Sli., i, 288 (1869); Terr. Moll., v, 107. 



A species of the Cumberland Subregion, having been found in East- 

 ern Tennessee and Lawrence County, Kentucky. It has also been 

 found in Western Pennsylvania, in the mountains. An extremely rare 

 species, until recently found by Mrs. G. Andrews in Mitchell and Mc- 

 Donald Counties, North Carolina. 



The only American species which this shell can be said to resemble 

 is Z. inornatuSj which in size and color is quite like it, and at first sight 

 may be taken for it. It diflers from it in the following particulars : The 

 upper and lower surfaces are both more flattened and the outline is a 

 more perfect circle ; the number of whorls in specimens of the same 

 size is greater by nearly one volution ; the surface of the whorls is 

 rounded; the last whorl expands but very little towards the aperture; 

 the base is broader, less indented, and very flat; the umbilicus is 

 rounder and better defined ; and the aperture is not thickened within 

 by a white, testaceous deposit; upper whorls striate. 



A variety with almost black shell is found. 



Lingual dentition as in Z. inornatus (see Ann. N. Y. Ac. Sc, I, Plate 

 XIV, Fig. J). Teeth 37-1-37. 



Genitalia unobserved. 



i 



