668 FRANK COLLINS BAKER 
considerable distance. It is not safe to list such material, and it 
has therefore been ignored. 
The list of mollusks obtained from the high-level deposit is as 
follows: 
SPHAERIIDAE 
Sphaerium sulcatum (Lamarck) 
Rare, only a half-valve was found. 
Sphaerium stamineum (Conrad) 
Not abundant, 7 valves included in the collection. 
Sphaerium solidulum (Prime) 
A half-valve is doubtfully referred to this species by Dr. Sterki. 
It is broken, but is apparently the same as the shells from the lower 
deposit referred to this species by Sterki. 
Pisidium virginicum (Gmelin) 
A half-valve of this large Pistzdiwm was found. It is common as 
a Pleistocene fossil and as a recent mollusk in Illinois. 
Pisidium compressum wlinoisense Sterki 
Three valves. The presence of this recently described Pisidium 
in this Pleistocene deposit is of interest. It lives in a reservoir and 
pond in Washington County, near Dubois, and in Sheller Lake, 
Jefferson County, in great numbers, obtained by the veteran 
Illinois collector, Mr. A. A. Hinkley. Of the species Sterki says 
(1916, p. 448), ‘‘All are of the same shape, differing somewhat in 
size and color, but remarkably uniform in each habitat. It is a 
peculiar form, having almost the significance of a species.” ‘Typical 
compressum was the only form of this genus found in the material 
collected by Dr. Savage. 
VIVIPARIDAE 
Ambloxis integra (DeKay)! 
This large snail occurs in the deposit in considerable numbers; 
the majority of the individuals, however, are young or half-grown. 
The adult shells are unlike any figured in the monographs, resem- 
bling most nearly Haldeman’s figure 2 of his monograph, but with 
1 See Pilsbry, Nautilus, XXX, pp. 109-14, 1917, for the reasons for the change 
of generic name from Campeloma. 
