36 INDEX TO PLATES. 



PLATE LIV. 



BULIMUS ZEBRA M u 1 1 e r . Common forms, young and 

 old. The large variety, with the animal, intended for 

 PLATES LIL, LIIL, have been omitted, p. 271. 



PLATE LV. 



BULIMUS FASCIATUS Miiller. A solid, nearly color- 

 less variety, described by Mr. Say as Achatina solida, 

 young and old. p. 266. 



PLATE LVI. 



BULIMUS FASCIATUS. Varieties, p. 268. 



PLATE LVII. 



BULIMUS FASCIATUS. The variety described as Acha- 

 ina crenata, by Swainson. p. 268. 



PLATE LVIII. 



BULIMUS VIRGULATUS Ferussac, p. 278. 



PLATE LIX. 



GLANDINA TRUNCATA Say, p. 301. With the animal. 

 Extremity of the lingual organ, magnified, p. 297. A por- 

 tion of the organ still more largely magnified, p. 303. 



PLATE LX. 



GLANDINA TRUNCATA Say. Ordinary forms, p. 301. 



