LIMN.EA. 33 



whitish spots ; tentacula broad, pyramidal, compressed ; ejes small, black, 

 placed at the inner base of the tentacula. 



This species is allied to L. catascopium of the American Fig. 38. 

 edition of Nicholson's Encyclopedia, but the revolution 

 of the whirls is more oblique., the shell thinner, the ajjer- 

 ture much more dilated, and the columella differently 

 formed. For several specimens of this shell I am indebted 

 to Mr. Titian Peale. 



Var. a. Small, black. From Cold Water Creek of the 

 Missouri. This is most probably a distinct species ; we 

 obtained but a single specimen of it. (Say.) 



Limnsea columella, Say, Journ. Acad. Nat. Sc. Phila. I, 



14 (1817); II, 107 (1821).— Nich. Enc. 3d ed. (1819); Binney's 



ed. CO, 56. — Haldeman, Mon. 38, pi. xii (1842). — Gould, Iuv. of 



Mass. 215, f. 144, 216, f. 145 (1841).— DeKay, N. Y. Moll. 72, pi. 



iv, f. 75 (1843).— PoTiEZ et Michaud, Gal. I, 216, pi. xxii, f. 5, 6.— 



Anon. Can. Natural. II, 197, fig. (1857). 

 Limneus columella, Kuster in Ch. ed. 2, 44, pi. viii, f. 3-5. 

 Limnsa chalybea, Gould, Am. Journ. Sc. [i], XXXVIII, 196 (1840) ; 



Otia, 180. 

 Limnxa macrostoma. Say, Journ. Acad. Nat. Sc. II, 170 (1821) ; Binney's 



ed. 67.— Gould, Inv. 217, f. 148 (1841).— Anon. Can. Nat. II, 198, 



fig. (1857). 

 Limneus macrostomus, KiJSTER in Ch. ed. 2, 43, pi. viil, f. 1,2. 

 Lhnnsea acuminata, Adams, Am. Journ. Sc. [i], XXXIX, 374 (1840). 

 Limnaca navicula, Valenciennes, Rec. d'Obs. II, 251 (1833). 

 Limnxa strigosa, Lea, Proc. Am. Phil. Soc. II, 33 (1841) ; Trans. IX, 12 



(1844) ; Obs. IV, 12. 

 Limnsea coarctata, Lea, Proc. Am. Phil. Soc. II, 33 (1841) ; Trans. IX, 11 



(1844) ; Obs. IV, 11. 

 LimnaYi casta, Lea, Proc. Am. Phil. Soc. II, 33 (1841) ; Trans. IX, 11 



(1844) ; Obs. IV, 11. 

 Limnsea columellaris, Adams, Sill. Journ. [i], XXXVI, 392, absq. descr. 

 Limnsea succiniformis, Adams MS. teste Haldeman. 



This species has been found from New England and Lake 

 Superior to Georgia. Its wide range and variable form has 

 caused its being described under several names, wliich are 

 mentioned in the synonymy and treated at length below. Mr. 

 Say's specimens of L. columella are still preserved in the Phila- 

 delphia Academy. One is drawn in my figure (Fig. 38). Speci- 

 mens of his L. macrostoma also are there preserved, one being 

 drawn in my figure (Fig. 39). From an examination of it and 

 of the following description, I am led to coincide with Haldeman 

 and DeKay's opinion of its identity with L. columella. 



