156 Bl'LLKTIN OF THE 



Mesodon Lawi, Lewis, (p. 335.) 

 Monroe Co., East Teiines.see. Mrs. G. Andrews. Houston Co., Georgia. 



Mesodon devius, Gould, (pp. 337, 432.) 



Plate III. Fig. I. 



The genitalia are here figured. 



The typical form was found by Mr. H. Hemphill, at Freeport, Cowlitz Co., 

 Washington Territory. 



Mesodon Sayii, Binney. (p 339.) 



Plate I. Fig. A, B. Plate II. Fig. K. 



An opportunity of examining the animal of this large form of M. Sayii, 

 for which I am indebted to Dr. Lewis, shows that the genital system (PL I. 

 Fig. B) is similar to that of the typical form, excepting that the penis-sac is 

 still more developed, surpassing by three times the whole genital system in 

 length. (See Vol. I., PI. XL Fig. 11.) 



The jaw and lingual dentition are the same as in the typical Sayii. I have 

 figured on Plate I. Fig. A, the dentition of this variety. 



In the mountains of Tennessee and North Carolina is found the form called 

 var. Chiloweensis, one of which is figured in the plate referred to (PL I. 

 Fig. K). 



Aglaia fidelis, Gray. (p. 350.) 



The small form from Mount Shasta, mentioned on p. 351, which also is 

 found at the Dalles, has the same dentition and genitalia as the typical form. 

 (See PI. IV. Fig. G.) 



There is a black variety from northern parts of California still more nearly 

 allied to infumata. 



Aglaia infumata, Gould, (p. 352.) 



The animal is black with brick-red tubercles. Latitude 37° 30' is said to be 

 its southern limit. Its shell is sometimes banded. Plate IV. Fig. B, C, rep- 

 resent the species denuded of its hairs. 



Aglaia Hillebrandi, Newcojib. (p. 352.) 



Calaveras Co., California. 



