110 THE CHICAGO ACADEMY OF SCIENCES. 
were sent, regards them as distinct from his A. haldemani, but they 
are too imperfect to admit of an accurate description of their charac- 
ters.” (Whiteaves. ) 
Type: Canadian Geological Survey. 
Horizon: St. Mary River series, Laramie, Cretaceous Period. 
Locatity: North or second branch of Milk River, Alberta. 
Remarks: This indeterminable Lymnzid may prove to belong to 
White’s auriculoid genus Tortacella. As its generic affinities are un- 
certain, it is included here. 
Lymnea Sp. 
Limnea sp.? STANTON and KNow ton, Bull. Geol. Soc. Amer., VIII, pp. 
131, 135, 1897.—StTanton, Proc. Wash. Acad. Sci., XI, p. 244, 1909; 1. c. XI, p. 
260, 1909—KNowLton, Proc. Wash. Acad. Sci., XI, p. 227, 1909. 
Horizon: Ceratops beds, Laramie, Cretaceous Period. 
Locatity: One and one-half miles south of U-L ranch, Con- 
verse County, Wyoming; northeast of George Moore’s ranch, Section 
16, Township 6, Sweetgrass County, Montana. 
ReMaArkKsS: This Lymneid has not been identified, so far as 
known, and its generic affinities are of course unknown. 
Lymneza Sp. Plate XVII, figure 3. 
Limnea? Wuite, Bull. U. S. Geol. Surv., 34, pp. 11, 22, pl. 2, fig. 13, 1886. 
“A single imperfect example was found at the Wales locality, 
which evidently belongs to the genus Limnea and the general aspect of 
which is like that of the living species, L. columella. No species of 
Limnea is yet known from either the Laramie or the Wasatch Group, 
to which this form can be properly referred; but it is possible that 
it is only a variety of the L. similis of Meek, from the Bridger Group 
of Southern Wyoming. This specimen is too imperfect to allow of a 
satisfactory specific description” (White). 
Horizon: Wasatch formation, Lower Eocene Period. 
LocaLity: Wales, Utah. P 
Remarks: Dr. White compares this Lymnezid with the recent 
columella, but it seems to be more nearly like some species of the re- 
cent catascopium group, and hence a Stagnicola. It also seems quite 
different from Meek’s similis. What its true affinities really are can 
only be accurately determined by the study of additional material. 
Acella haldemani (White). 
Acella haldemani Wuite, Bull. U. S. Geol. Surv. Terr., IV, p. 714, 1878 = 
Tortacella haldemani, a genus of Auriculide. 
Bear River formation (Cretaceous). 
