20 THE NAUTILUS. 



A single shell of Lymnaea dalli (Baker) was found in a meadow 

 jnst east of the isthmus, clinging like a land shell to the under side 

 of a piece of wood. The pool of the isthmus has been ruined 

 for shell life by the application of oil, and probably no fresh- 

 water shells now inhabit any enclosed water on Put-in-Bay 

 Island. 



Kelley's Island, about five miles southeast of Put-in-Bay, 

 was partially explored. It yielded: 



l j olygyra albolabris (Say), ordinary light-colored form; 

 Polygyra albolabris (Say), reddish form in marshy woods. 

 Polygyra zaleta (Binn.); Polygyra thyroidus (Say^ ; Polygyra pro- 

 funda (Say); Polygyra fraudulenta Pils. ; Polygyra inflecta (Say); 

 Polygyra mullilineata (Say); Polygyra monodon (Rack.). 



Vallonia pulchella (Mull.). 



Bifidaria armi/era (Say); Bifidaria contructa (Say); Bifidaria 

 holzingeri Sterki. 



Zonitoides arbor ea (Say). 



Pyramidula solitaria (Say); Pyramidula alternata (Say). 



Helicodisats parallelns (Say). 



Sucdnea ava.ra Say; Succinea retusa Lea. 



ON THE CLASSIFICATION OF THE LYMN.EIDS, 



BY FRANK C. BAKER. 



Recently several interesting contributions have appeared 

 which contain valuable data bearing on the classification of the 

 family Lymnseidse, These treat somewhat critically of the pre- 

 vious classifications which have been attempted. Roszkowski 1 

 presents a handsomely illustrated paper full of data on the 

 structural and biological aspects of the Lymnreas of Lac 

 L6man. This lake has already provided material for the pens 

 of several distinguished malacologists; among them Forel and 

 Brot. Roszkowski' s researches add greatly to what we already 

 know concerning the deep-water and littoral fauna of this 

 interesting lake. 



'Contribution a 1'^tude des Limn6es du Lac Le"man. Revue Suisse de 

 Zoologie, xxii, No. 15, July, 1914, pages 457-539, plates 14-17. 



