SUCCINEA. 81 



8. SUCCINEA NUTTALLIANA, LEA 



PLATE LXVII. a. FIGURE 1. 



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

 spira anfractibus tribus, conicoconvexis ; sutura impressa : 

 apertura ovata ; columella arcuata, tumida, baud sinuata. 



SYNONYMS AND REFERENCES. 



Succinca nuttalliana, 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 lines of 

 growth ; composed of about three tumid whorls, forming 

 a conical spire, the last whorl constituting nearly the 

 whole shell ; suture well marked : aperture nearly two- 

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

 front, the posterior angle being also somewhat rounded 

 by the abrupt curvature of the lip ; columella very 

 gently curved, the region being 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 8. ovalis found in the region of the Hudson and 

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



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