SUCCINEA. 81 



8. SUCCINEA NUTTALLIANA, LEA 



Plate LXVU. a. Figuke 4. 



Testa ovato-lanceolata, fragili, lucida, cornea, striata: 

 spira anfractibus tribus, conico-convexis ; sutura impressa : 

 apertura ovata ; columella arcuati, tumida, baud sinuata. 



STNONTMS AMD EEFEKENCES. 



Succinea nuttalliaTia, Lea, Trans. Amer. Philos. Soc, N. S. IX., 4. 

 DESCRIPTION. 



Shell, lanceolate-ovate, thin and fragile, of a dull 

 horn-color, somewhat rudely undulated by the hnes of 

 growth ; composed of about three tumid whorls, forming 

 a conical spire, the last whorl constituting nearly the 

 whole shell ; suttire well marked : aperture nearly two- 

 thirds the length of the shell, ovate, broadly rounded in 

 front, the posterior angle being also somewhat I'ounded 

 by the abrupt curvature of the Up ; columella very 

 gently curved, the region bemg somewhat gibbous ; no 

 fold on the columella, but in the region of the spire it is 

 slightly sinuous. 



Geographical Distribution. Brought from Lewis's 

 River, Oregon, by Thomas Nuttall, Esq., and also by the 

 United States Exploring Expedition. 



Remarks. This shell so closely resembles the speci- 

 mens of *S'. ovalis found in the region of the Hudson and 

 the Mohawk, that it may not be possible to point out anj 



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