ste 
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THE NATURAL HISTORY SURVEY. 177 
of the foot from the head to the posterior extremity, the two 
ends meeting above the tail where a rounded and prominent 
mucus gland is formed. This gland has the power of closing 
and expanding. 
Jaw: ‘Very arcuate, of almost uniform breadth, ends 
blunt; anterior surface with transverse strie; concave margin 
simple, with a well developed, blunt, median projection.” (W. 
G. Binney.) 
Radula: ‘Lingual membrane very broad, composed of 87 
rows of 129 (64-I-64) long, slender teeth each; centrals tri- 
cuspid; laterals 4, bicuspid, in a straight, transverse row; mar- 
ginals aculeate, in a somewhat crescentic row. Another mem- 
brane had 57-1-57 teeth.” (W.G. Binney.) 
Genttaha: See under Omphalina. 
Distribution: Southern Canada south to Florida, west to 
Michigan and Arkansas. 
Geological distribution: Pleistocene; Loess. 
Habitat: In moist, somewhat open woodlands. 
Remarks: A species easily distinguished by its large size 
and glossy surface. The only locality from which authentic 
specimens have been obtained is near Maywood, in 1892. Dur- 
ing the last three years the writer has carefully searched all 
about that region but without securing a single specimen. It 
is, therefore, a doubtful species for this region. 
Genus VITREA Fitzinger. 
Vitrea FITZINGER, Syst. Verzeich, p. 99, 1833. 
Hyalinia AGASSIZ, in CHARPENTIER, Nouv. Mem. Soc. Helv., Vol. I, 
p. 18, 1837. 
Hyalina of BINNEY, TRYON, and other authors. 
Polita HELD, Isis, p. 916, 1837. 
Glyphyalinia MARTENS, Biol. Cent. Amer. Moll., p. 117, 1892. 
Animal of VITREA CELLARIA Miiller. (After Binney.) 
Shell; Small, thin, glassy, shining, heliciform; spire gen- 
erally depressed; aperture rounded or lunate; peristome very 
thin, acute. 
Animal: With no accessory organs upon the genital sys- 
tem; dart sac not present; other characters as in Omphalina 
(Fig. 33). 
