56 



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



Fig. 86. 



Fig. 8G rtprescuts specimens in the collection, some of wliicli 

 bear a resemblance to forms of L. cata- 

 scopium, though the mqfe globose 

 among them would hardly be referred 

 to that species. So variable are the 

 species of this genus that I have hesi- 

 tated in proposing a specific name for 

 them. They were collected by Dr. 

 JIayden, at Grindstone Creek (No. 8304 of collection). 



LimncBti catascopui.m ? 



Fig. 87. 



L.iinntea caperata, Say. — Shell suboval, a little oblong, okscurely 

 Tellowi.sh-horn color; spire half the length of the mouth; apex acute; 

 whirls slightly wrinkled across, and with very numerous, equal, 

 subequidistant, elevated, minute, revolving lines ; suture not 

 very deeply impressed ; aperture rather dilated ; fold of the 

 labium not profound. 

 Inhabits Indiana. 



The remarkable character of this species consists in the nume- 

 rous revolving lines with which the surface is marked, but these 

 are so minute as to require the aid of a magnifier to bring them 

 to view. It was found on laud subject to inundation, near New 

 Harmony, by Dr. Troost. {Say.) 



Limnaeus caperatus, Sat, New Harmony Diss. U, 230 (1829) ; Descr. 23 ; 



Binney's ed. 148 ; Kuster in Ch. ed. 2, 47, pi. viii, f. 27-30. 

 Limnaea caperata, Haldeman, Mon. 34, pi. xi, f. 1 — 9 (1842). — Adams, 



Shells of Vermont, 154 (1842).— DeKay, N. Y. MoU, 69, pi. iv, f. 



66, 69 ; pi. V, f. 79 (1843).— Mrs. Gray, Fig, Moll. An. pi. cccx, f. 8. 

 Limnaea umbilicata, Adams, Am. Journ. Sc. [i], XXXIX, 374 (1840) ; 



Boston Journ. Nat. Hi.st. Ill, 325, pi. iii, f. 14 (1840).— Gould, Invert. 



of Mass. 218, f. 149 (1841). 



This species is found in the British Possessions as far north as 

 Hudson's Bay, and through the northern tier of States from New 

 England to Lake Superior. The form known as L. umbilicata 

 is found along the northern tier of States to Michigan, has been 



