286 HELICID^. 



Remarks. This species belongs to a somewhat 

 numerous group found in the tropics, ■wherever the ba- 

 nana and other Musacese flourish ; some of -which have 

 the columella truncated, and are arranged under the 

 genus Achatina, like A, octona, though by their natural 

 affinities they are clearly associated. The banana and 

 plantain have, by transj^lantation, become naturalized 

 throughout the tropics ; and it is highly probable that 

 many shells found with them, which have received differ- 

 ent names merely because they have been found in local- 

 ities far remote from each other, are really identical. 

 This shell is considerably smaller and more rapidly taper- 

 ing than A. octona, which has its columella somewhat trun- 

 cated, and has not as yet been found on this continent. 



9. BULIMUS EXIGUUS, Sat. 



Plate LIII. Fighee 1. 



B. testa minutissima, alba, fusiformi, sub-acuminata ; 

 anfractibus quinque vel sex, obliquis, convexis ; apertura 

 obliqua ; columella dente albo ornata ; labro albo, reflexo. 



SYNONYMS AND EEFEEENCES. 



ft- 



Pupa exigua, Say, Journ. Acad. II. 375. 



GouiJ>, Boston Journ. III. 398, pi. 3, f. 20. 



Inverlebrata, 191, f. 120. 

 De Kay, New York Report, 31 ; Fauna, 49, pi. 4, f. 46. 

 Adams, Vermont Moliusea, 8. 



DESCRIPTION. 



Animal colorless ; tentaculse stout, hyaline, one-third 

 the length of the foot, the upper pair alone developed. 



