Goodrich : A Trip to Islands in Lake Erie. 



531 



Middle Sister Island, Ontario. 



Helicodlscus parallelus (Say) 

 Circinaria concava (Say) 

 Bifidaria contractu (Say) 

 Siiccinea avara (Say) 



Polygyra albolahris goodrichi Clapp. 



zaleta (Binney) 



profunda strontiana Clapp. 



thyroides (Say) 



htjlecta (Say) 



fraiidulenta Pilsbry 

 Pyramidula solitaria strontiana Clapp. 

 alternata eriensis Clapp. 



North Harbor Island, Ontario. 



Polygyra albolahris goodrichi Clapp. 

 profunda strontiana Clapp. 

 inflecta (Say) 

 fraudulenta Pilsbry 



Pyramidula solitaria roseo-apicata Clapp. 



alternata eriensis Clapp. 

 Circinaria concava (Say) 



East Sister Island, Ontario. 



Polygyra zaleta (Binney) 



profunda (Say) 



tnjlecta (Say) 

 Vitrea hamtnonis electrina (Gould) 

 Zonitoides arboreus (Say) 



Pyramidula solitaria roseo-apicata Clapp. 



alternata (Say) 

 Ariolimax campestris (Binney) 

 Succinea avara Say. 

 Bifidaria contractu (Say) 

 Vallonia parvula Sterki var(?) 



Mouse Island, Ohio — visited in 1912. 



Polygyra albolabris (Say) 



profu7ida strontiana Clapp. 

 inflecta (Say) 



Pyramidula solitaria mousensis Clap]j. 



alternata (Say) 

 Zonitoides arboreus (Say) 



