126 THE NAUTILUS. 
Length, 5.0; diameter, 3.7; length of aperture, 2.5; width, 
2.0mm. Topotype. 
Length, 4.5; diameter, 3.9; length of aperture, 2.4; width, 
2.0mm. Paratype. 
Length, 4.0; diameter, 3.0; length of aperture, 2.0; width, 
1.5mm. Paratype. 
Specimens of A. winkleyi measure: 
Length, 4.8; diameter, 3.1; length of aperture, 2.2. Nau- 
tilus, Type. 
Length, 4.8; diameter, 3.0; length of aperture, 1.8; width, 
1.5mm. Topotype. 
Winkleyi is a species of the New England States, its original 
locality being Saco, Maine, and that a form of this Amnicola 
should be found in Ohio, and in a Pleistocene deposit, is sur- 
prising. It is not unlikely, however, that winkleyi may occur 
in recent collections in the central States. The Ohio specimens 
seem to depart varietally from the typical form as described by 
Pilsbry (NaurtiLtus, XXVI, p. 1, pl. 1, figs. 9-10). Some 
thousands of specimens from this Pleistocene deposit show little 
departure from the race as described above. Occasional globose 
forms occurring with winkleyi show the relationship of the form, 
although none have as wide a body whorl as the fossil race. It 
is possible that this race may occur in other Pleistocene marl 
deposits. 
PHYSA ANATINA Lea. 
A large Physa occurring in the Rush Lake deposits differs 
slightly from anatina in being larger with shallower sutures and 
more flat-sided spire whorls; the body whorl is wider as is also 
the aperture; the spire is very sharply pointed and the colu- 
mella has a distinct plait. Characteristic specimens measure 
as follows: 
Length, 16.5; width, 9.0; aperture length, 11.5; width, 5.0 
mm. Fossil. 
Length, 17.5; width, 10.0; aperture length, 13.0; width, 5.5 
mm. Fossil. 
Length, 12.0; width, 7.0; aperture length, 8.5; width, 3.7 
mom. Fossil. 
