20 THE NAUTILUS. 



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

 just 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 : 



Polygyra albolabris (Sa}^), ordinary light-colored form; 

 Polygyra albolabris (Saj'-), reddish form in marshy woods. 

 Polygyra zaleta (Binn.); Polygyra thyroidus (Say;; Polygyra p'O- 

 funda (Say); Polygyra Jraudulenta ViIb.] Polygyra inflecta (Say); 

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



Vallonia jpulchella (Miill. ). 



Bifidaria armifera (Say); Bifidaria contructa (Say); Bijidaria 

 holzingeri Sterki. 



Zonitoides arborea (Say). 



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



Helicodiscus jjarallelvs (Say). 



Succinea avara Say; Succinea retusa Lea. 



ON THE CLASSIFICATION OF THE LYMN^IDS. 



BY FRANK C. BAKER. 



Recently several interesting contributions have appeared 

 which contain valuable data bearing on the classification of the 

 family Lymnssidse. These treat somewhat critically of the pre- 

 vious classifications which have been attempted. Roszkowski ^ 

 presents a handsomely illustrated paper full of data on the 

 structural and biological aspects of the Lj'^mnseas 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 I'^tude des Limn^es du Lac L^man. Revue Suisse de 

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



