SUCCINEA. 77 



whorls a little tabulated posteriorly. Aperture narrow- 

 ovate, acute posterioi-ly ; the columella has an indistinct 

 fold. 



Length, three-tenths of an inch ; Ijreadth, three-twen- 

 tieths. 



Geographical Distribution. As yet, this species 

 has been found only in the State of Ohio. 



Remarks. This small species is about the size of 

 »S'. avara, but is less ventricose in form, and of a more 

 vitreous structure, and more yellow cast of color. The 

 aperture especially, is far less rounded ; indeed, it is 

 more narrow than in any other American species. — [g.] 



«. SUCCINEA OREGONENSIS, LEA. 

 Plate LXVII. c. Figupe 2. 



Testa elongato-ovata, tenui, crocea, striis obsoletis re- 

 motis cincta : spira anfractibus tribus rotundatis ; sutura 

 conspicua ; apertura ovata ; columella arcuata, absque plica, 

 vitrea. 



SYNONYMS AND EEFEEENCES. 



Sitccinea oregonauis, Lea, Proc. Amer. Philos. Soc. 1S41, II. 32. 

 DESCRIPTION. 



Shell elongated ovate, tliin, of a somewhat saffron- 

 yellow color, rather coarsely, though obtusely and dis- 

 tantly striated transversely. Spire with two and a half 

 or three well rounded whorls, separated by a distinct 

 suture, the last whorl seven-eighths the length of the 

 VOL. II. 20 



