Foreman, of Baltimore, who seems to have found it plenti- 

 fully. It comes nearer to P. rupicola, than to any of Mr. 

 Say's species. 



PUPA MILIUM. 



Plate III. fig. 23. 



P. testa minutissima, ovali, castanea ; anfractibus quatuor convexis, oblique stria- 

 tis ; apertura cordata, dentibus sex, compressis armata, quorum duobus labio affixis. 



Shell minute, of a globosely-oval form, color a light-chest- 

 nut; whorls four or somewhat more, obviously wrinkled 

 obliquely, rather convex ; apex bluntly rounded ; suture deep ; 

 aperture half the width of the last whorl, heart-shaped, the 

 apex being at the left posterior angle ; the transverse margin 

 is nearly direct ; the outer lip is scolloped by an indentation 

 of the lip ; the remainder of the margin is regularly arcuated ; 

 lip white, slightly everted ; throat with six teeth, two of which 

 are on the transverse lip, equidistant ; one, with a tubercle at 

 its base, is on the middle of the columella, and nearly at right 

 angles with the preceding, and is the largest ; a fourth is on 

 the indenture of the outer lip, directed between the two on 

 the transverse lip ; and two smaller ones, more retired within 

 the shell, are equidistant between the two last-mentioned ; 

 umbilicus large and deep. Length less than ^ of an inch ; 

 breadth ^ of an inch. 



This is the most minute species I have yet seen ; even 

 more so than P. exigua. In size and outline it may be com- 

 pared with P. vertigo, DRAP., (Vertigo pusilla of other 

 authors) of Europe ; but that is a reversed shell. The teeth 

 are all distinct, long, compressed, and very sharp. I first 

 discovered it at Oak Island, Chelsea, on a warm, damp day, 

 in November, 1839, crawling upon fallen leaves, in company 

 with Bulimus lubricus. Professor Adams has since found it 

 in Vermont. It, doubtless, has a wide range, but its minute- 

 ness renders it difficult to be detected. 



