EXPLANATION OF PLATES OF VOL. IIL 443 



XLII. Fij:^. 1 . Zonitcs demissus. 

 Fig. 2. Mesodon jejuna. 

 Fig. 3. Stcnotrcma hirsutum. 

 Fig. 4. stenotrcma. 



XLIII. Pomatia Buffoniana : a Mexican species omitted from this volume. Sec 



Vol. II. 

 XLIV. Fig. 1. Stenotrema spinosura. 



Fig. 2. Edgarianum. 



XLV. Fig. 1. Polygyra Texasiana. 

 Fig. 2, 3. Triodopsis inflecta. 

 XLVI. Hemitrochus varians, var. f, rj, 6. i. 



