inhabiting the United States. 425 
may be readily separated when mingled. Indeed its 
claims as a distinct species are not very obvious 
without viewing the three together. It is found 
abundantly under fragments of wood in damp places 
near the water's edge; in company with HELIX chér- 
sina and Pura modésta. 1 have never seen it in 
company with either HErix indentata or HELIX ar- 
bórea, and it seems to differ from them widely in 
habit, in thus preferring the vicinity and even en- 
croachment of water." 
4l. aktii MULTIDENTATA. 
; _ Plate XXII. fig. 5. 
H. testi minima, orbiculato-depressà, umbilicata, tenuissimá, pellu- 
cidà, nitidà, supra planulatà ; anfractibus sex obliqué et minuté stria- 
tis; apertura semi-lunatà, angustà ; labro simplici, acuto; umbilico 
parvo. 
du Ainii AND » Rrrrarwors 
Helix multidentàta, Nobis. s 
DESCRIPTION. 
ail Dirab thread-like. 
Shell. Depressed, sub-planulate above, very nibh 
pellucid ; epidermis smooth; shining; whorls six, 
very narrow, revolving in the same plane, and not 
enlarging towards the aperture, with minute, raised, 
oblique stris ; suture distinct ; aperture semi-lunate, 
narrow ; lip acute ; umbilicus very small, rounded, 
not RETS any of the volutions; base convex, 
indented around the umbilicus. Two rows of very 
