I have made out some of Mr. Say's species with certainty, 

 and have become satisfied with regard to others in my pos- 

 session, that they were unknown to him. Two or three of his 

 species I have not yet seen, or have failed to identify them. 



It is hoped that the accompanying figures may put an end 

 to further doubts as to the species which they represent ; and, 

 by the aid of conchological friends, I may hereafter be ena- 

 bled to present figures of the remaining un-illustrated species. 

 I would especially request of those who have species not here 

 described, that they would favor me with the loan of them, or 

 send me descriptions or figures of them. 



PUPA CORTICARIA. 

 Plate III. fig. 19. 



P. testa, albida, sub-cylindracea, obtusa ; anfractibus quinque ; apertura sub-orbic- 

 ulari ; labio dente unico prope angulum externum 3 sub-dentato ad angulum inter- 

 num ; labro revoluto. 



" Odostomia corticaria. Shell dextral, cylindrical, obtuse 

 at the apex ; whorls five, not perceptibly wrinkled or striate. 

 Aperture sub -orbicular, lip reflected ; a single tooth on the 

 pillar lip, near the outer angle ; inner angle with an angular 

 projection resembling a second tooth, sometimes obsolete. 



" Length about a tenth of an inch. 



" Very common under the bark of trees near the earth, and 

 resembles Turbo muscorum of authors." (SAY, in Nicholson's 

 Encyclop. (Amer. ed.) article Conchology, pi. IV. fig. 5.) 



The shell, when fresh, is transparent, and of a spermaceti- 

 color ; but it is usually found opaque and chalky. All the 

 specimens I have seen were from Ohio. Mr. Earle, however, 

 in his " Catalogue of Massachusetts Land Shells," enumerates 

 this as a native. The shell, which has hitherto borne this 

 name in the Society's Cabinet, is PUPA contracta. Mr. Say 

 compares it with T. muscorum, of Montagu, not Linnaeus, 

 (P. umbilicata, DRAP.,) to which it does not bear a very strong 

 resemblance. He states it to be very common under the bark 

 of trees ; but it certainly is very rare in collections. 



