282 THE CHICAGO ACADEMY OF SCIENCES. 
white callus, bordered internally with very deep red or chest- 
nut. The original locality was Poland, Ohio, and it has since 
been found in Michigan, Utah and Nebraska, which distribution 
shows that it is likely to be found anywhere within the area 
bounded by these localities. In the present region it has been 
found in Mud Lake, Berry Lake (collected by Prof. W. K. 
Higley), and in a ditch at Robey. 
Length, 20.00; width, 7.00; aperture length, 7.50; width, 3.75 mill. (8382.) 
“ 18.00; “ 600; « “700; «2.50 “ (8382) 
112d. Limnza reflexa exilis Lea, pl. xxxii, fig. 3; pl. xxxi, fig 3. 
Limnea exilis LEA, Trans. Amer. Phil. Soc., Vol. V, p. 114, pl. xix, fig. 
82, 1837. 
Limnea reflexa variety BAKER, Trans. St. Louis Acad. Sci., Vol. 1X, 
p. 19; pl. i, fig. 3, 1901. 
Shell: Elongated,attenuated, thin; color light corneous or 
honey-yellow; surface shining, growth lines distinct, crowded, 
crossed by numerous very fine incremental striz; apex smooth, 
very dark brown; whorls six to seven, flat-sided, rapidly in- 
creasing in size, the last a little over one-third the length of 
the entire shell; spire long and very much attenuated; sutures 
impressed, margined below bya white band which is frequently 
edged with chestnut; aperture elongate-ovate, slightly con- 
tracted at the upper part; peristome sharp, thin, a rather heavy 
callus within which is dark chestnut colored, the remainder of 
the aperture being brownish or horn color; this color shows on 
the outside as a light band; umbilicus closed; columella oblique, 
not twisted, covered with a thin callus and with a light plait. 
Length, 37.00; width, 11.00; aperture length, 14.00; width, 6.00 mill. 
ss 30.00; “ 9.00; eS - 13,00; 45. -6,00-* 
te 24,00; ** 7.50; s Me LO 50s Done 
Distribution: Mississippi Valley, occurring also in Michi- 
an. 
: Remarks: This variety in its typical form is almost dis- 
tinct enough to constitute a species, and might be so designated 
did not intermediate forms occur. The most pronounced dis- 
tinguishing characters are the flat-sided whorls, particularly 
the last, the long, steeple-shaped spire and the shallow sutures. 
The peculiar twist, so characteristic of typical vef/exa, is absent, 
as is also the wide aperture. The animal is similar to reflexa; 
the radula has the formula }#+§+12+1+419+6+34 (40-1-40), 
the teeth being the same as those of veflexa. 
This very distinct variety has been found only in the Cal- 
umet River, so far as at present known. 
