182 The Ohio Journal of Science [Vol. XX, No. 6, 



Lymnaea (Galba) reflexa Say, common. "The specimens are 

 mostly immature and show a great amount of variation. 

 Evidently the bod}?" of water in which they lived was sub- 

 ject to much fluctuation in amount of water." (Dr. Baker). 

 Some specimens are much like elodes Say, and a few 

 resemble palustris Muller. 



Lymnaea (Galba) nashotahensis Baker, rather frequent. "This 

 species was originally described from marl deposits in 

 Wisconsin and it is of great interest to find it in your local- 

 ity. It is apparently related to both reflexa and elodes.'' 

 (Dr. Baker). 



Lymnaea (Galba) humilis modicella Say, fairly common. 



Lymnaea (Galba) humilis rustica Lea, rather common, small; 

 there are forms intermediate between the two. 



Lymnaea (Galba) parva Lea, not common, small. 



Lymnaea (Galba) dalli Baker, common, small and variable. 



Lymnaea (Galba) caperata Say, common, mostly rather small. 



Lymnaea (Galba) caperata, form? Small, with short, 



pinched-in spire and pointed apex, and comparatively large 

 body whorl; nothing like it has been seen before. 



Planorbis trivolvis Say, abundant, somewhat variable; some 

 are more or less deformed, crippled. 



Planorbis umbilicatellus Cockerell, two specimens, rather small 

 and apparently immature. 



Planorbis parvus Say, common; somewhat small, with narrow 

 whorls, markedly different from most of the Tinkers Creek 

 marl. Many are variously deformed, crippled. 



Planorbis crista Linnaeus, scarce; both forms: the one known 

 as cristatus, and nautilens, smooth, also intermediate 

 specimens. Rare, recent, in Ohio, Indiana, etc., but prob- 

 ably overlooked at some places, on account of its small size. 



Segmentina armigera Say, common, rather small. 



Ancylus kirklandi Walker, apparently, a few. 



Ancylus rivularis Say (?) few. 



Ancylus pumilus Sterki, several. 



There are evidently several other Ancyli, but the specimens 

 were insufficient, immature, and broken. One is probably of an 

 undescribed species. 



