THE NAUTILUS. 95 



Pisidium compression Isevigatum Sterki. Deuel Co. 

 Pisidium sargentii Sterki. Deuel Co. 



Pisidium overi Sterki. Deep waterhole in creek one half mile 

 south of Clear Lake, Deuel Co. 



Pisidium walkeri Sterki. Hidewood Creek, Deuel Co. 

 Pisidium pauperculum crystalense Sterki. Deuel Co. 



The following post-glacial fossils, Wisconsin drift, were taken 

 from a well 20 feet beneath the surface, 3 miles north of Grand- 

 view, Douglas Co., in 1883 by Prof. J. E. Todd, at that time 

 State Geologist. The specimens were identified by Frank C. 

 Baker. 



Pisidium compressum Prime. Lymnaea stagnalis appressa 



Pisidium var labile Prime. Say. 



Pisidium medianum Sterki (?) Planorbis trivolvis Say. 



Valvata tricarinata Say. Planorbis bicarinatus Say. 



Valvata lewisii Currier. (antrosus Conrad) 



Succinea avara Say. Planorbis antrosus striatus 



Physa sp. (immature) Baker. 



Lymnaea (Galba) palustris Planorbis deflectus Say. 



Mull. Planorbis parvus Say. 



Planorbis exacutus Sav. 



PUPOIDES INORNATTIS N. SP. 



E. G. VANATTA. 



Shell small, cylindrical, rimate ; apex obtusely rounded, 

 white ; the lower part, of the shell opaque flesh colored ; surface 

 with a few irregular growth stria? ; suture impressed, ascending 

 at the aperture ; whorls 5, convex, slightly shouldered below 

 the suture ; base obtusely angular. Aperture more than one- 

 third the height of the shell ; oval, truncate, without lamellae 

 or plicae ; parietal callus transparent ; lip and columella opaque, 

 white, thick, broadly reflexed. Alt. 3.61, diam. 1.37, apert. 

 alt. 1.30, diam. 1.07 mm. 



Type in the collection of the Academy of Natural Sciences, 



