454 FRANK COLLINS BAKER 



Viviparidae 

 Campeloma integrum ohesum (Lewis) Tryon. All of the 

 Campelomae in the collection (and these shells are quite abundant) 

 appear referable to this race of integrum. A few individuals have 

 a more elongated spire and more ovate shell and might be referred 

 to integrum. The variation, however, is all toward the obese type 

 of shell and it seems best to refer all to the race. The majority 

 of the individuals are adult. The shells are quite solid and heavy. 



Ancylidae 



Ferrissia rivularis (Say). That such fragile shells as the 



Ancylidae should be preserved in a flood-plain river deposit is 



surprising. Five specimens of this river limpet occurred in about 



two quarts of material examined. The specimens are fairly well 



preserved. 



Physidae 



Physa crandalli Baker. A heavy-shelled Physa with thick, 



reflexed inner lip and deep-sutured whorls is referred to this species. 



Only one specimen out of a score or more is adult. The same 



species has been reported by Daniels from Indiana in the recent 



fauna of Knox County (Daniels, 1903, p. 603). 



Planorbidae 



Planorhis antrosus Conrad. The antrosus from the Indiana 

 deposit are smaller than those from the Ohio deposit. The aper- 

 ture does not show a tendency to become bell-shaped as in so many 

 ^of the Ohio specimens. Only seven individuals, mostly immature, 

 were found in the material from the Indiana deposit. 



Planorhis parvus Say. This small Planorhis seems to be typical 

 parvus and not altissimus which is so abundant in the Ohio deposit. 

 It is the same size as specimens of parvus from Philadelphia and 

 about half the size of altissimus. 



Lymnaeidae 



Galha humilis modicella (Say). The only l)annaeid in the 

 Indiana deposit is referable to modicella, the individuals of which, 

 mostly immature, are similar to the recent shells of this species 

 from the state. Obrussa decampi, so common in the Ohio deposit, 

 is apparently not found in these Indiana beds. 



