PUPA EXIGUA. 

 Plate III. fig. 20. 



P. testa minutissima, albida, oblongo-ovata, sub-acuminata ; anfractibus quinque 

 convexis; labio per-obliquo, prope angulum internum dentato; columella sub-den- 

 tata ; labro revoluto. 



" Shell dextral, tapering, oblong, with minute grooved lines ; 

 apex obtuse ; whorls five ; suture deeply impressed ; labium 

 bidentate, superior tooth situate rather beneath the middle of 

 the lip, inferior tooth small, placed on the columella ; labrum 

 mutic reflected, not flattened ; umbilicus distinct. 



" Length more than one twentieth of an inch. 



" This is the smallest species I have seen. Its aperture re- 

 sembles that of P. (Cary'chium) corticaria, but the superior 

 tooth of the labium of that shell is situate much nearer to the 

 superior termination of the labrum than the corresponding 

 tooth of this diminutive species. It is probably a CARY'CHIUM." 

 (SAY. Journ. Acad. Nat. Sc. II. 375.) 



Mr. Say found it near Philadelphia. Professor Adams has 

 obtained it near Middlebury, Vt., and it has been collected 

 in various regions in Ohio, by Dr. Kirtland, Dr. Ward, and 

 Mr. J. G. Anthony. A few specimens have been found under 

 moist boards in Cambridge. 



It is remarkable for its minuteness, its tapering form, and 

 its very oblique, oval aperture. The similarity between it and 

 the Turbo cary'chium, of Montagu (Test. Brit. 339. SuppL 

 pi. XXII. fig. 2,) which is the Cary'chium minimum of Leach 

 and Pfeiffer, is almost perfect. 



PUPA CONTRACTA. 

 Plate III. fig. 22. 



P. testa alba, ventricosa, obtusa ; anfractibus quinque convexis ; apertura sub-tri- 

 angulari, expansa ; labio dente magno excavate ; labro revoluto, sinuato ; dente 

 altero in faucibus profundo. 



" Shell dextral, short, sub-ovate, white ; apex obtuse ; 

 whorls five ; umbilicus distinct ; aperture irregularly orbicular, 

 complete, the lamina of the labium being elevated above the 



