MUSEUM OF COMPARATIVE ZOOLOGY. 143 



tliis puzzling group are better understood, a description of Z. Lawi may be 

 given. 



Zonites placentnla, W. G. Binn. (not of Slmttlewortli), Terr. Moll. U. S., V. 124, 

 Fig. 44, not descriptioti. 



Mountains of Tennessee and Xortli Carolina. 



There is a variety in which is a heavy internal callus or plate like teeth 

 within the aperture. 



This species furnished the lingual membrane described in Vol. V. as that of 

 Z. capseUa. 



Zonites fulvus, Mull. (p. 125.) 

 The dentate form sometimes has radiating rows of teeth, as in multidentatus. 



Zonites Stearnsi, Bland, (p. 130.) 



This species from the ribbed form of its jaw must be considered a Microplnjsa 

 (see belowj. 



Zonites cuspidatus, Lewis, (p. 113.) 



Plate II. Fig. C. 



This form, previously referred by me to a variety of Z. cerinoideus, may l)o 

 considered a distinct species, or a form of gulwis. It is not a variety of ceri- 

 noideus (see p. 111). The internal tooth-like processes within the aperture 

 strongly curved one towards the other form almost an arched space. The um- 

 bilicus is closed. 



Found by Miss Law in Monroe Co., Tennessee ; by Mrs. Andrews on Roan 

 Mountain, Mitchell Co., North Carolina. 



Zonites maoilentus, Suuttl. 



Plate II. Fig. B. 



Formerly I referred this to Z. lasmodon, but having received specimens from 

 near Shuttleworth's original locality, I am convinced of its being distinct. The 

 original description is given in Vol. III. p. 20. 



It is found in the mountains of Tennessee and North Carolina. 



Zonites lasmodon, Thillips. (p. 131). 



The caudal mucus pore is erect, not the simple longitudinal slit as in 

 Z. suppressus (see Fig. on p. 128). 



