HELIX. 107 



and move ivith great rapidity, often entering and 

 coming out of the respiratory foramen. Their jiresence 

 does not seem to cause any uneasiness, nor even to be 

 felt by the snail. ^ 



6. HELIX CLiAUSA 



Plate IV. 



H. testa sub-globosa, sub-imperforata, luteo-cornea ; an- 

 fractibus striatis, striis minutis, crebris ; apertura rotun- 

 data ; peristomate albo, margine reflexo. 



SrNONTMS AND REFERENCES. 



Helix clauea, Say, ■ Jour. Acad. II. 154. 



American Conch. No. 4. pi. 37, f. 1. 



BiNNEY, Boston Jour. Nat. Hist. I. 482, pi. 15. 



KiRTLAND, Ohio Report, 172. 



Sageb, Michigan Catalogue, 14. 



De Kay, New York Report, 31. 

 Hdix MitcJuUiaiia, Lea, Am. Phil. Trans, vi. 87, pi. 23, f. 71. 

 Hdix Mitctiella, Kirtland, loc. cit. 173. 



DESCRIPTION. 



Animal. Blackish. 



Shell. Rounded, or somewhat globular; epidermis 

 light yellowish brown or russet color; suture distinct; 



' Hijpopits concolor, Haldeman. Oval, nearly colorless 

 or very pale oehraceous ; bristled ; sides impressed. 

 Length, 0.4 millim. 



Difi'ers in outline from the European species, which it 

 resembles in general appearance, mode of life, and in the 

 large pair of projecting setae anteriorly and posteriorly. A 

 colored dorsal line has been observed. 



