FAMILY HELICID^ HELIX. 33 



Helix concava. 



plate 11. fig. 15. a. b. — (state collection.) 



.^ Helix concava. Say, Journ. Acad. Nat. Sciences, Vol. 2, p. 159i 



H. id. Wheatley, Cat. Sheila U. S. No. 492, p. 19. 



4 



Description. Shell much depressed, orbicular. Whorls five, irregularly wrinkled across, 

 and more convex beneath. ^Suture distinctly impressed. Lip simple, very slightly reflexed 

 towards the base. Aperture large but short, in the line of the axis of the shell. Umbilicus 

 large, funnel-shaped, exhibiting distinctly all the volutions (which are there very prominently 

 corrugated) to the summit. 



Color. Light corneous, or whitish with a tinge of yellowish green, immaculate. 



Diameter, 0-7. Height, 0-35. 



Of this remarkably distinct species, I have received specimens from the western district of 

 this State, and from the neighborhood of Lake Champlain. It does not appear in Gould's 

 Catalogue of the Shells of Massachusetts. Mr. Wheatley, however, assigns its locality in 

 the Eastern States. To the west it seems to be more numerous, and has been noticed in 

 Ohio and Missouri. 



V ^ ■ 



^.■_ Helix palliata. 



PLATE ni. FIG. 36. A. B. PLATE IL FIG. 16. a. B. Variety. — (STATE COLLECTION.) 



Helix palliata. Say, Journ. Acad. Nat. Sciences, Vol. 2, p. 132. ' * <^w 



H. obstriua. Id. Journ. Acad. Nat. Sciences, Vol. 2, p. 154. ■" -' • ** " 



H. denotata. Ferussac, Histoire des Moll. PI. 49, A. fig. 5. _ . " ' • •. ' , 



H. carolmcnsis. Lea, Am. Phil. Trans. Vol. i, p. 102, pi. 15, fig. 33. 



CarocoUa hdkoides. Id. Am. Phil. Trans. Vol. 4, p. 159, pi. 15, fig. 34. 



H. palliata. BiNNEY, Journ. Nat. Hist. Vol. 3, p. 353. 



Helice notable. Lahabce, An. sans vert. Ed. Brux. Vol. 3, p. 309. 



Description. Shell subdepressed or depressed, with elevated revolving and minute trans- 

 verse lines, and numerous minute tubercles with scattering stiff hairs. Whorls five, very 

 slightly convex above, distinctly convex beneath, and forming in one variety (PI. 8, fig. 16, b.) 

 an obtuse angle, appearing like a prolongation of the broadly reflected lip. Aperture usually 

 trilobed. Umbilical region covered with a white callus. Lip widely reflected, with two ob- 

 tuse sinuses on each side, forming a prominent tooth between them, and a third profound sinus 

 near the middle of the lip ; occasionally a single tooth on the outer lip. Pillar with a large 

 white oblique tooth. 



Color. Reddish brown ; reflected portion of the lip white, tinged occasionally with blue. 



Diameter, 0-7 -0-9. Height, 0-5. 



Fauna — Part 6. 5 



