INDEX TO PLATES 



PLATE I. 



Hkhx major Binney, p. 96. 



PLATE n. 



Helix albolabris Say, with the annual. Lingual 

 teeth, p. 102. The arrow indicates the central range; a, 

 the lateral portion, the continuation of which is placed 

 above ; b, a longitudinal series of hooks, showing their in- 

 clination forwards, p. DO. 



PLATE IIL 



Helix multilineata Say, with the animal, p. 103. 



PLATE IV. 



Helix clausa Say. Hijpopys concolor, Haldeman, 

 the minute acaridian which infests the animal of this and 

 other species, p. 107. 



PLATE V. 



Helix Columbiana Lea, p. 169. 



VOL. III. 4 



