— 7 — 



07. Planorbis lentus Say. Not common. Iiitenne- 

 diate forms seem to exist between this Htnl the 

 preceding-. 



68. Planorbis bicarinatus Say. Common. 



69. Planorbis campanulatus Say. Rather rare; 



pools two ?niles southeast of New Philadelphia. 



70. PiiANORBis dilatatus Gould. Commdii. 



71. Planorbis deflectus Say. > Scarce. 



72. Planorbis . Rather scarce; pools and ditches. 



73. Planorbis exacutus Say. Not common. 



a. var. kubellus, n. A very peculiar form, quite dif- 

 ferent from the type: small (diam. 4.5 mill.), red- 

 dish horn colored; the whorls are comparatively 

 much narrower than in the type, the umbilicus is 

 wider and less deep. Stone Creek Valley, near Od- 

 bert's station. 



74. Planorbis parvus Say. Common everywhere; 



va,riable in size, coloratioii and thickness of the 

 shell. 



75. Planorbis circumlineatus Tryon. Rare; swamp 



on the Ohio canal, southeast of Blake's Mills. 



76. Planorbis albus Muell. Rare. Swamp on the 



Ohio canal. 



77. Planorbis (Planorbula) armigerus Say. Com- 



mon. Its javv (main piece) is of a peculiar form, 

 arcuate, with a projecting median part on the cut- 

 ting edge, as in Zonitidae; lateral parts very nar- 

 row and thin, barely perceptible. 



78. GuNDLACHiA "meekeana Stimpson? Agrees bet- 



ter with G. californica". Found in a small pond, or 

 pool, at Goshen station, in April, 1891; about 200 

 were collected. In November of the same year 

 and in April, 1892, none could be found; the water 

 had nearly dried up. Very probably this interest- 

 ing mollusk had been brought to the place by mi- 

 grating birds, a few years previous, but seems to 

 have spread from there, as two specimens were 

 found in another pool, about two miles distant, in 

 June, 1894, (one of them a dead shell). 



79. Ancylus ? Scarce in some pools along the C, L. & 



