place has been allotted them, in a former part of this volume (Let- 

 ter VI. p. 54 ; ) and with respect to Bulla simulata, Brand. Fossil Han- 

 ton, Fig. 61, it certainly can have no claim to be considered as a Bulla, 

 the spire being acutely pointed, the cauda produced, and the columella 

 plicated. 



The bullites of the environs of Paris appear to be divisible into four 

 species : B. ovulata, B. striatdla, B. cylindrica, B. coronata. 



XLVII. Bulimus. An ovate or oblong, subturreted shell : the open^ 

 ing entire, oblong, and longitudinal, having, in adults, an external 

 reflected margin : the columella smooth, the base entire, not spread 

 out. 



The oblong and longitudinal opening of the shell is, according to Bru- 

 guiere, the chief characteristic of this genus : Lamarck, also, adopts 

 this distinguishing mark ; and, by the assistance of other essential cha- 

 racters, has formed from the genus Bitlima, of Bruguiere, not only this 

 genus, but those of Agathina, Lymnea, Melania, Auricula, and Pupa. 



The shells of this genus are inhabited by an animal much resembling 

 that which belongs to the genus Helix. The shells of the two genera, 

 however, differ, in the opening of the Helix being wider than it is long, 

 whilst that of Bulimus is always longer than it is wide. The snail, too, 

 has a round or orbicular shell, and that of the Bulimus is oblong, conical, 

 or turriculated. The margins, in Bulimus, are separated in the upper 

 part; but in Helir, the last turn but one of the spire projects into, and 

 thereby contracts, the opening. The shells of Bulimus are distinguished 

 from those of Melania by their having no widening at the base of their 

 opening; and from those of Lymnea by their not having a distinct and 

 very oblique fold, which is seen in the shells of the last-mentioned 

 genus. Bulimus is a land shell; but, Lymnea and Melania are fresh- 

 water shells. 



I do not know of any British fossil species; but Lamarck describes ten 

 species decidedly of this genus : B. alhidus, B. citherella, B. terebellatus, 

 B. acicularis, B. nitidus, B. sextomis^ B. conulus, B. clavulus, J5, striatulus.* 



