58 



Observations on the Terrestrial 



SucciNEA ( Mighels mentions only one habitat, but it is 

 AVABA. ) now abundant in many places. 



HELisosrA { " ^ot aware that it is abundant anywhere." 

 BiCABiXATUs. ) Very common and abundant. 



Planorbella ( " Abounds in all parts of the State." 

 CAMPANULATus. ) Do not meet with it thus frequently. 



LiMNOPHTSA 

 DESIDIOSA. 



("Rare." 



) Extremely abundant everywhere. 



Radix 



AMPLA. 



The discoverer asserts that this species was 

 very abundant in second Eagle Lake N. Lat. 

 47°: he also found Physa ancillaria, "summer 

 of 1842." In the summer of 1859 Mr. John M. 

 Gould and myself made a careful survey of 

 this lake by closely examining its shores, and 

 by dredging in various parts of the lake, and 

 met with no specimen of Physa ancillaria, and 

 but six or seven dead specimens of Radix 

 ampla, though we found an abundance of Am- 

 nicolse, Valvatas and Planorbes. 



AxcYLus J '' Fo^^"^^ i^ plenty." 

 EivuLARis. ( Ancylus is one of our scarcest shells. 



