Number 49 . March 18, 1918 



OCCASIONAL PAPERS OF THE MUSEUM OF 

 ZOOLOGY 



UNIVERSITY OF MICHIGAN 



Ann Arbor^ Michigan Published by the University 



NOTES ON NORTH AMERICAN NAIDES. I 

 15 V Bryant Waeker 



I 



Friersoii has shown that the original type named by Lea 

 for his genus Symphynota was Uuio alatiis Say and that con- 

 sequently Symphynota becomes a synonym of Proptera Raf. 

 and that Lasmigona Raf. as the earliest available name becomes 

 the generic type. 



Another consequence is that the group included by Simp- 

 son in the subgenus Symphynota is left without a name un- 

 less Lymnadea Sw^ (Treat. Mai., 1840,. p. 379) is available. 

 But I do not think that it can be used. Swainson listed three 

 species under his new genus: — L. data Sw. {U. alatiis Say), 

 L. fragilis Sw. (U. gracilis Bar.) and "?L. compressa Lea." 

 In his text where he discusses the systematic position of 

 Lymnadea (1. c. p. 265) he figures alata as the representative 

 of the genus and in citing compressa on p. 379 prefixes it with 

 an " ?" showing that he was not certain that it really belonged 

 to the genus. 



