40 INDEX TO PLATES. 



PLATE LXXII. 



Fig. 1. PUPA PENTODON Say. Wood-cut of the aper- 

 ture magnified, p. 330. That at the right represents the P. 

 Tappaniana of Adams ; that at the left, the P. curvidens, 

 Gould. By error, it is referred to PLATE LXII. in the 

 text. p. 328. 



Fig. 2. PUPA VARIOLOSA Gould, p. 331. 



Fig. 3. PUPA SIMPLEX Gould. The animal to which 

 the wood-cut at the end of the text refers, is unknown. 

 p. 343. 



Fig. 4. PUPA CORTICARIA Say, p. 339. Wood-cuts 

 of the aperture magnified, p. 340. 



PLATE LXXII a. 



CTCLOSTOMA DENTATUM Say, p. 348. (Erratum in 

 text, " LXXII.") 



PLATE LXXIII. 



HELICINA ORBICULATA Say, several varieties, p. 352. 

 Lingual hooklets magnified, p. 44. 



PLATE LXXIV. 



Fig. 1. HELICINA RUBELLA, Green, p. 353. 



Fig. 2. HELICINA OCCULTA Say, p. 356. 



Fig. 3. HELICINA ORBICULATA Say, a large variety, 

 p. 352. 



Fig. 4. HELICINA CHRYSOCHEILA Binney, p. 354. 

 The lingual organ, represented at the conclusion of the 

 text, is unknown. 



