35 



70. Planorbis briarinatus Say. Common. 



71. Planorbis campanulatus Say . Rare. 



72. Planorbis dilatatus Gld. Common. 



73. Planorbis deBectus Say. Rare. 



74. Planorbis umbilicatellus CrII. Not common, 



pools and ditches. 



75. Planorbis exacutus Say. Not very common. 



76. Planorbis rubellus Sterki. Rare. Stone Creek 



Valley near Odberts Station. (Also known 

 from Michigan.) 



77. Planorbis parvns Say. Common; variable in 



size, color and thickness of the shell. 



78. Plan. circumlineatus Try on. Rare. Small 



swamp south-east of New Philadelphia. Is 

 considered by some conchologists, a var. of 

 parvus, yet seems to be distinct. 



79. Planorbis hirsutus Gld. Rare; swampy place 



of Ohio Canal. Closely resembling the 

 European PI. albus Mull. 



80. Planorbis ( Planorbula ) armigerus Say. 



Common. 



81. Gundlachia ''meekeana Stimson? Agrees with g. 



californica." — Fc:)und in a pool, at Goshen 

 Station, in April 1891 where about two 

 hundred were collected. In November of the 

 same year, and in April 1892, none could be 

 found, and none since. Tw^o specimens were 

 collected in another pool, about two miles 

 distant, in June 1894, and in November of 

 the same year, a few young were found in the 

 Tuscarawas river. 



82. Ancylus — ? Scarce in some pools of the Tus- 



carawas Valley. 



83. Ancylus diaphanus Hald. Common, especially in 



the river. Variable: there are specimens 

 with low and obtuse apex. 



84. Ancylus tardus Say. Not very common, in the 



river and Stillwater Creek. Variable. 



