4 THE CHICAGO ACADEMY OF SCIEN@ES. 
Type: Canadian Geological Survey. 
Horizon: Laramie, Cretaceous Period. 
Locauity: Blind Man River, Township 40, Range 1, west of the 
Fifth Principal Meridian, Saskatchewan. 
Galba compactilis (Meek). Plate XVI, figure 23. 
Limnea (Limnophysa?) compactilis MreeK, 6th An. Rep. U. S. Geol. Surv. 
Terr., p. 517, 1873; Bull. U. S. Geol. & Geog. Surv. Terr., IL], p. 611, 1877.— 
Wuite, 3rd An. Rep. U. S. Geol. Surv., p. 445, pl. 26, fig. 14, 1883. 
Limnea compactilis Miter, Journ. Cin. Soc. N. H., IV, p. 101, 1881; 
Mes. & Czenoz. Geol., p. 243, 1881. 
Limnea? compactilis Marcou, Proc. Nat. Mus., VIII, p. 330, 1885.—Boy te, 
3ull. U. S. Geol. Surv., no. 102, pp. 167, 168, 1893—ScHuCHERT, Bull. U. S. 
Nat. Mus., 53, 1, p. 355, 1905. 
“SHELL rather small, slender, subfusiform; spiral conical, a little 
longer than the aperture; volutions about six, very little convex, and 
(for a Limnza) compactly wound together; last one not ventricose, 
but rather produced below; suture distinct though shallow, and but 
little oblique ; aperture narrow subovate, very narrowly rounded below, 
and acutely angular above; outer lip not dilated; columella a little 
twisted, and apparently so as to form a small oblique plication. Surface 
smooth. 
length of aperture, 0.22 inch; breadth of aperture, 0.10 inch” (Meek). 
Type: U.S. Nat. Mus. no. 8207. 
Horizon: Laramie, Cretaceous Period. 
Locarity: Separation Station, Union Pacific Railroad, Carbon 
County, southern Wyoming. 
Remarks: “I have not seen specimens of this little shell showing 
the columella clearly enough to be sure that it belongs to the genus 
Limnea. There is a compactness in the rolling together of the volu- 
tions of the spire, and a want of obliquity and deepness observable 
in the suture; they are not often seen in that genus, and remind one 
of some forms referred to sections of the old genus Bulimus, such, 
for instance, as B. (Thaumastus) californicus’ (Meek). 
This is a doubtful representative of Lymnea. It is said by Dr. 
White to “probably belong to the genus Thawmastus, and not to Lim- 
nea.’ The figures of White do show a close resemblance to recent 
species of Thaumastus, and it may, as suggested, belong to that genus 
rather than to Lymnea. The figures also bear a close resemblance 
to certain half-grown Lymnezas of the subgenus Stagnicola (reflexa, 
palustris, exilis, etc.), and it is included here to complete the list of 
extinct Lymnzas. Future research may place the species in Thau- 
“Length of a medium-size specimen, 0.50 inch; breadth, 0.20 inch; 
a 
