HELIX. 253 



75. HELIX SUPPRESSA, Say. 

 Plate XXXVII. Figure 1. 



H. testa conve.xo-depressa, minute perforata, nitida, luteo- 

 cornea ; anfractibus se.\, crebre et minute striatis ; labro 

 simplici, acuto, intus incrassato^, apertura transversal!, dente 

 unico lamelliformi armata. 



SYNO.NYMS AND KEFERENCES. 



Helix suppressa, Sat, Disseiniiuilor, &c. 



Desc. of Nf w Terr, and Fluv. Sliclls, 14. 

 BiNNEY, Boston Journ. Nat. Hist. III. 410, pi. 11, f. 3. 



DESCRIPTION. 



Animal bluisb-Llack, darker on the head, tentacles, 

 and neck; superioi- tentacles long and filiform, lower 

 short. Length twice the diameter of the shell. On the 

 upper surface of the extremity of the foot is a longi- 

 tudinal fissure or furrow, from which mucus e.xudes in 

 great quantities, and which the animal shuts and closes 

 at will. 



Shell convex-depressed, thin, pellucid ; epidermis 

 polished, yellowish horn-color ; spire flat ; whorls six, 

 with crowded, minute, oblique striis ; suture impressed, 

 distinct ; aperture transverse, not expanded ; hp simple, 

 thin at its edge, thickened within ; base rather convex, 

 near the aperture opaque, yellowish white ; umbilicus 

 small, but rounded and distinct, in young shells, obsolete 

 or hardly apparent in older ones ; within the aperture 

 on the outer lip, are one or two lamelliform, elongated, 

 oblique teeth. 



Greatest transverse diameter one-fourth of an inch. 



VOL. II. 61 



