126 HELICEA. 



Biscayne, Florida. The variety described on page 273 is 

 figured on pi. 77, fig. 13. 



Agatina fuscata Rafinesque (vol. i. p. 50) is to be added 

 to the synonymy. 



BULIMUS SERPERASTRUS SAY vol. ii. p. 274, pi. 1. fig. 2. 



Bulimus serperastrus SAY (Binney's ed.) p. 39. 



CHEMNITZ, ed. 2, p. 82, pi. xxx. fig. 122; pi. xxxix. fig. 5, 



(1854). 



PFEIFFER, 1. c. iii. 341. 

 PHILIPPI, Icon. iii. 23, p. 97, tab. 9, fig. 6. 

 /3 Gracilior, spira elongata. 



Bulimus Liebmanni PFEIFFER. 

 Bulimus Ziebmanni REEVE. 

 y. Minor, imperfectus. 



Bulimus nitelinus REEVE. 



The above varieties are given solely on the authority of 

 PfeifTer. 



The geographical distribution of the species doubtfully 

 quoted by Gould as synonyms seem to remove the proba- 

 bility of their identity with this shell. 



BULIMUS ALTERNATUS SAY vol. ii. p. 276, pi. li. fig. 2; pi. li. a; 



pi. Ixxx. fig. 3; fig. 1? 

 Bulimus alternatus SAY (Binney's ed.) p. 39. 



PFEIFFER, Mon. Hel. Viv. ii. 221. 

 Bulimus lactarius PFEIFFER, 1. c. ii. 187; iii. 415. 



REEVE, 1. c. No. 217. 



GOULD, Ter. Moll. iii. p. 35. 

 Bulimus dealbalus BINNEY, 1. c. pars, nee Say. 



There exists a great deal of confusion in regard to this 

 and the allied species. 



Bulimus alternatus is thus described by Say : 



BULIMUS ALTERNATUS. Ovate conic, with alternate gray and 

 brownish longitudinal vittse. Inhabits Mexico. 



Shell umbilicated, ovate-conic, with longitudinal lines, subequal, 

 gray and light brownish vitta3 ; the brown is paler, almost approach- 

 ing in some instances a drab ; the white vittae consists of more or 



