94 THE CHICAGO ACADEMY OF SCIENCES. 



TYPE: Canadian Geological Survey. 

 HORIZON : Laramie, Cretaceous Period. 



LOCALITY : Blind Man River, Township 40, Range 1, west of the 

 Fifth Principal Meridian, Saskatchewan. 



Galba compactilis (Meek). Plate XVI, figure 23. 



Limncea (Limnophysa?) compactilis MEEK, 6th An. Rep. U. S. Geol. Surv. 

 Terr., p. 517, 1873; Bull. U. S. Geol. & Geog. 'Surv. Terr., Ill, p. 611, 1877. 

 WHITE, 3rd An. Rep. U. S. Geol. Surv., p. 445, pi. 26, fig. 14, 1883. 



Limncea compactilis MILLER, Journ. Cin. Soc. N. H., IV, p. 101, 1881; 

 Mes. & Csenoz. Geol., p. 243, 1881. 



Limncea? compactilis MARCOU, Proc. Nat. Mus., VIII, p. 330, 1885. BOYLE, 

 Bull. U. S. Geol. Surv., no. 102, pp. 167, 168, 1893. SCHUCHERT, Bull. U. S. 

 Nat. Mus., 53, i, 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 Limnaea) 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 a medium-size specimen, 0.50 inch ; breadth, 0.20 inch ; 

 length of aperture, 0.22 inch; breadth of aperture, 0.10 inch" (Meek). 



TYPE : U. S. Nat. Mus. no. 8207. 



HORIZON : Laramie, Cretaceous Period. 



LOCALITY: 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 

 Limncea. 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) calif ornicus" (Meek). 



This is a doubtful representative of Lymncea. It is said by Dr. 

 White to "probably belong to the genus Thaumastus, and not to Lim- 

 ncea." 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 Lymncea. The figures also bear a close resemblance 

 to certain half-grown Lymnaeas of the subgenus Stagnicola (reflexa, 

 palustris, exilis, etc.), and it is included here to complete the list of 

 extinct Lymnaeas. Future research may place the species in Thau- 



