A P P E N D I X . 



1. List of Shells collected by Mr. Schoolcraft, in the western 

 and northwestern territory. 



by william cooper. 



11KLIX. 



1. Helix albolabris, Say. Near Lake Michigan. 



2. Helix alternata. Say. Banks of the Wabash, near and above 

 the Tippecanoe. Mr. Say remarks, thai tins i two species, so common 

 in the Atlantic states, were DOt met with in Major Long's second expe- 

 dition, until their arrival in the secondary country at the eastern extremity 

 of Lake Superior. 



PLANORBIS. 



n. Planorbis tampanulatus, Say, Itasca (or La Biche) Lake, the 

 source of I Bppi. 



i. Planorbis trivoi.y: , Say. Li m. Th^se two spc- 



re also observed by Mr. It as the Falls of Niagara. 



LYMN1 



o. Lvmnet's (TMBIOSCTS, Say. Am. Con. iv. pi. xxxi. fig. 1. Laks 

 WfanipeO) I'pp^r Mississippi, and Rainy Lake. 



M 



