116 . LAND AND FRESH- WATER SHELLS OF N. A. [PART II. 



lines, forming grooves between them. Spire concave ; aperture large, em- 

 bracing a considerable portion of the body whirl, within bluish-white ; lip 

 a little thickened internally, and of a red or brown- 

 ish color, vaulted above ; umbilicus large, exhibiting 

 the volutions. Length one-fourth of an inch ; breadth 

 one-half of an inch. Animal aquatic, dark ferrugi- 

 nous, with very numeroias, confluent, pale yellowish 

 points ; teutacula long, setaceous, with confluent 

 points ; foramen on the left side. 



That ingenious naturalist, Mr. C. A. Lesueur, found 

 this species of a miich larger size in French Creek, 

 near Lake Erie ; breadth three-fourths of an inch 

 nearly ; color almost black, purplish-red within the 

 mouth. 



Lister (^Cochlea trium orbium, Lister, Conch, tab. 



Planorhis trieolvl?. csl, f. 46) figures this shell pretty accurately, and it 



is referred to in Graelin's edit, of Syst. Nat. p. 3615, 



as alhella, but it is certainly not that species. (Petiver, Gazophyl. pi. cvi, 



f. 17.) 



This is an inhabitant of the Middle and Northern States, and is very 

 common in many districts. I have found it in Pennsylvania, New Jersey, 

 Delaware, Maryland, Falls of Niagara, Upper Canada, and in the vicinity 

 of Council Blufl" on the Missouri. Dr. Eights sent me specimens from 

 Albany, New York, and Mr. Jessup gave several from Cayuga Lake. Lister 

 gives two pretty good figures of this shell, and quotes Virginia as the 

 native locality. Muller, Gmelin, and Dillwyn incorrectly referred to 

 Lister's figures as Helix ulhdl a ; \>ui the latter author, in his edition of 

 Lister, agrees with us in considering them as representations of the present 

 species. {Say.) 



Planorhis trivohis, Sat, Nich. Ency. pi. ii, f. 2 (1817, 1818, 1819) ; Am. 



Conch, pt. 6, pi. liv, f. 2 (1834) : Binxey's ed. p. 44, pi. Ixx, f. 2 ; pi. 



liv, f. 2.— DeKat, N. Y. Moll. 59, pi. iv, f. 59, a, h (1843).— Gould, 



Inv. of Mass. 201, f. 131 (1841).— Haldeman, Mon. 13, pi. ii, f. 4-7 



(1844).— Adams, Shells of Vt. 154 (1842).— Kuster in Chemn. ed. 



2, p. 53, pi. V, f. 4-6 ; pi. vi, f. 1-6, 20-25.— Potiez et Michaud, Gal. 



des Moll. I, 214, pi. xxi, f. 19-21.— Anon. Can. Nat. II, 202, fig. (1857). 

 Bulla JlnviatiUs, Say, Jour. Acad. Nat. Sc. II, 178 : ed. Bisn. 71. 

 Planorhis regularis, Lea, Tr. Am. Phil. Soc. IX, 6 ; Proc. II, 32 (1841) ; 



Obs. IV, 6. 

 Planorhis megastoma, DeKay, N. Y. Moll. 61, pi. iv, f. 60, 61 (1843). 

 Phjisa planorhula, DeKay, N. Y. Moll. 76, pi. v, f. 83 (1843). 

 Planorhis corpulenius, DeKay, N. Y. Moll. 64, pi. xiii, f. 185 (1843).— 



- Whittemore, Am. Journ Sc. [i], XXXVIII, 193. 

 fPlanorhis probosridcus, Potiez & Micuaud, Gal. des Moll. I, 213, pi. xxv^ 



f. 13-15 (1838). 

 Planorhis ina'crostonius, Wuiteaves, Can. Nat. VIII, 113, fig. (1863). 



