THE NAUTILUS. 19 



three and a half miles long and about one and a half miles across 

 at the broadest place. It is divided into two unequal parts by 

 an isthmus. Nearly the whole breadth of this isthmus is occu- 

 pied by a pool, which until lately was bordered on one side by 

 a little patch of woods. 



Here are found: 



Polygyra albolabris (Say), a reddish form characteristic of 

 marshy woods on the Lake Erie islands; Polygyra multilineata 

 (Say); Polygyra monodon (Rack.). 



Vallonia pulchella (Miill.); Vallonia excentrica Sterki; Vallonia 

 parvula Sterki. 



Bifidaria armifera (Say); Bifidaria contracta (Say); Bifidaria 

 pentodon (Say); Bifidaria holzingeri Sterki. 



Vitrea hammonis (Strom); Vitrea indentata (Say). 



Zonitoides arborea (Say); Zonitoides minuscula (Binn.). 



Agriolimax campestris (Binn.) 



Succinea retusa Lea var. higginsi Bland. 



In 1914 a monument to Commodore Perry was set up at one 

 corner of the pool, and incidentally this interesting shell station 

 was ruined. It was doubtless the type locality of Succinea 

 retusa higginsi Bland. However, the same Succinea was found, 

 though less copiously, beside a little bay west of the village. 



Still farther west a considerable piece of dry, rocky woods 

 extends along the shore, and contains: 



Polygyra albolabris (Say), ordinary light-colored form; Poly- 

 gyra zaleta (Binn.); Polygyra ihyroidus (Say); Polygyra profunda 

 (Say); Polygyra fraudulenta Pils. ; Polygyra infiecta (Say). 



Philomycus carolinensis (Bosc.). 



Pyramidula solitaria (Say). 



Succinea ovalis Say ? 



(This Succinea, of which only fragmentary dead shells were 

 seen, and also the two slugs enumerated, are given from 

 memory. ) 



Elsewhere on Put-in-Bay Island were found: 



Pyramidula cronkhitei anthonyi Pils. 



ffelicodiscus parallelus (Say). 



Carychium exiguum (Say). 



While Pyramidula alternata (Say) is generally distributed. 



