320 THE CHICAGO ACADEMY OF SCIENCES. 
Animal: See under P. subulare. 
Distribution: Ohio, Tennessee, Alabama, Illinois, Indiana, 
etc. 
KEY TO SPECIES OF PLEUROCERA. 
a. Last whorl rounded or subangulated; whorls rounded; aper- 
ture OValy 304645 VF Sioa ss xmas ee eee ee ae subulare 
b. Last whorl strongly carinated, whorls flat-sided, often heav- 
ily spirally striated; aperture triangular.................... elevatum 
130. Pleurocera subulare Lea, pl). xxxv, figs. 1, 2. 
Melania subularis LEA, Trans. Amer. Phil. Soc., Vol. IV, p. 100, pl. xv, 
fig. 30, 1834. 
Shell: Smooth, elevated, acute, turreted; color pale brown- 
ish horn, with a yellowish band encircling the whorls just below 
thesuture; there is sometimes an indication of a purplish band 
just above the periphery; apex rounded, smooth, horn-colored, 
bent in toward the whorls; surface shining, polished, lines of 
growth oblique, crowded, here and there more elevated than 
the average; sutures deeply impressed; whorls eleven, regu- 
Fie. 114. 
Operculum of PLEUROCERA SUBULARE Lea. (Original.) 
larly increasing, the upper seven carinated just above the su- 
ture, the last four rounded; base of shell broadly conic, suban- 
gulated; imperforate; aperture ovate, narrowed above, white 
or bluish-white within, sometimes showing two spiral, brownish 
bands, produced and somewhat canaliculate below; peristome 
acute, sinuous, rather.thick; columella bluish-white, twisted; 
terminations of peristome and columella joined by a thick, 
somewhat spreading callus. Operculum paucispiral, chestnut 
brown, the nucleus on the lower margin of the left side. The 
lines of growth rather coarse, showing under a lens that the 
operculum is made up of small plates or lamine (Fig. 114). 
Length, 22.00; width, 8.00; aperture length, 6.50; width, 4.00 mill. (9967.) 
“ 9100; « 7.00; 7.00; “ 350° “ ((9967.) 
“ 9400; « 8,00; “7.00;  “ 400 “ (9967.) 
“ 18.00; “ 7.50; « “ 700; « 4,00 “ (9967.) 
“ - 9050;  ° 750; 2 © 9,00; 9.98. 85 MO 067.) 
Animal: With a wide, short, thick foot, truncated before 
and rounded behind; color blackish above, yellowish under- 
