SUCCINEA. 69 



careous matter in the shell than in the other species. 

 When somewhat advanced in age they want the peculiar 

 transparency and deUcate periostraca common to other 

 species of the genus, and in general aspect are not un- 

 like some Bulimi. If differences are admitted, where 

 all are so much alike, this southern species is unques- 

 tionably different from any of its northern congeners. 



The shell described by Messrs. Gould and Mighels, 

 and that indicated by Dr. Sager, by name, as Sucdnea 

 campestris, is in oui' opinion not the shell described by 

 Mr. Say under that name. 



2. SUCCINEA OBUQUA, Say. 

 Plate LXVU. b. Figure 3. 



S. testa ovata, lymnse-formi, tenui, pellucida ; anfractibus 

 ternis vel quatuor convexis, ultimo anfractu magno ; aper- 

 tura ovali, obliqua ; spira brevi. 



SYNONYMS AND BEFERENCES. 



Sucdiiea avails, Say, Phil. Journ. I. p. 15, 11. p. 163. 

 KiKTLAND, Loc. cit. p. 173. 

 Fekussac, Tab. Sysl. No. 8, pi. 11, A., f. 1. 

 Lamarck, 2d edit. VIII. p. 319. 

 Sucdnea obliqua, Say, Exped. St. Petei-s, IX. p. 260, pi. 15, f. 7. 

 Adams, Shel's or Vermont, p. 6. 

 De Kay, Loc. cit. p. 31. 

 Sucdnea campestris, Gould, Iiiverieb. of Mass. p. 195, f. 126. 

 Sager, Loc. cit. p. 11. 

 Mighels, Loc. cit p. 28. 

 Sucdnea totteniana, Lea, Proceed. Amer. Philos. Soc. II. 31 - 2. 



DESCRIPTION. 



Animal. Superior tentacles blackish, their base 



VOL, II. 18 



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