narrower reflection of the lip, but occasionally examples are 
found with the broadly reflected lip and thicker shell char- 
acteristic of the typical form. 
Three examples from Port Austin, Huron county, which 
are identical with Ohio specimens named by Sterki, measure 
as follows: 
Alt.11 mm. Greaterdiam. 19% mm. WLesserdiam.11 mm. 
ve 13% a ee 21% ee 6s 1 oe 
ee he oe 66 D2 6s ee 13% ee 
It has also been found at Lansing and in Presque Isle, Char- 
levoix and Marquette counties. In the last locality it was 
associated with specimens similar in form, but larger, thus 
connecting it with the typical form. 
11. PoLyGyrA EXOLETA (Binn.) 
The apparent distribution of this species is peculiar. It 
has not been reported from west of Lansing nor north of 
Saginaw. Its failure to appear in the southwestern part of 
the state seems extraordinary, in view of the fact, that as a 
rule molluscan life is much more abundant on the western 
side of the state than on the eastern. 
12. POLYGYRA MULTILINEATA (Say). 
Usually an abundant species south of the Saginaw Grand 
Valley. 
12a. POLYGYRA MULTILINEATA ALBA (Witter). 
This form was catalogued, but without description, by 
Currier in 1868. It was described under the same name in 
_ 1878 by Witter (J. of Con. I 384). It has been found associ- 
ated with the typical form in Kent and Washtenaw counties. 
**Rare in Kent county,” Streng. 
12b. PoLYGYRA MULTILINEATA RUBRA (Witter). 
Like the preceding, catalogued without description in 
1868 as var. wnicolor by Currier. Witter (loc. cit.) described 
it in 1878 as var. rubra. 
Listed only from Kent and Ottawa counties in the 
western part of the state. It has not as yet been noticed in 
the eastern portion. ‘‘ Rare in Kent county,” Streng. 
13. POLYGYRA PALLIATA (Say). 
Saginaw-Grand valley and in the southeastern part of 
the state. It will probably be found to have a general distri- 
bution through the entire southern portion. ‘‘Scarce in 
Kent county,” Streng. 
