BULIMUS. 287 



The foot is short, thick, distinctly divided into two seg- 

 ments, the anterior of which is bilobcd, and projects, 

 when the animal is in motion, considerably in advance of 

 the head. Eyes oval, situated on the back, near the 

 l^ase of the tentacles. Its motions are very sluggish. 

 It carries the shell directed horizontally, which is so 

 transparent that the viscera of the animal may be seen 

 through it. 



Shell elongated, tapering at both ends, white, trans- 

 lucent, shining ; apex rather obtuse ; whorls five to six, 

 conTex, very oblique, with transverse striae ; suture dis- 

 tinct, impressed ; aperture obliquely oval, white, with a 

 prominent plait on the columellar margin, about midway 

 between the extremities of the lip, and a slightly promi- 

 nent fold near the junction of the lip with the umbilical 

 extremity of the shell ; lip thick, reflected, flattened ; 

 umbilicus perforated. 



Length one-fifteenth, breadth one-fortieth of an inch. 



Geographical Distribution. Common in all the 

 Northern and Middle States. It has also been found in 

 Ohio and Arkansas. 



Remarks. The extreme minuteness of this shell has 

 doubtless prevented its being noticed in many localities 

 where it exists. It probably inhabits a very wide range 

 of territory. The plane of the aperture is not so nearly 

 parallel with the axis as in the preceding species. It 

 has been said to resemble Carycliium minimum of Miil- 

 ler ; but neither the figure nor description, as given by 



