12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



Genus Type & Synonym 



Unio. 



U. sinuata (My a ma/rgaritifera ? 

 Linn.) 

 §Lk. Prod. 87 cites Mya margaritifera, Lin., 

 but as already noted his citations in this work 

 for genera other than his own cannot be ac- 

 cepted. In Lk. Syst. 114 the totally different 

 U. littoralis, Cuv., is cited, but neither that 

 species nor the U. sinuata, Lamk. [=auricu- 

 larius, Spengler, 1793], named by Children, 

 was included in the genus when founded by 

 Retzius in 1788 and consequently are invalid. 

 U. margaritifera was made the type of a new 

 genus Margaritifera by Schumacher in 181 6 

 and this invalidates Turton's selection of it 

 in 183 1. Hence U. pictorum, Lin., selected by 

 Gray in 1847 becomes the type. 

 25 51 Hyria H. avicitlaris {Mya syrmatophora? 



Gmel.) 

 §The identity of avicularis with synnatopliora 

 being doubtful Children's selection stands 

 though Herrmannsen favors the latter. 

 [Generic name preceded by Paxyodon, Schu- 

 macher, 181 7.] 



25 51 Anodonfa 



26 52 A. cygneus (Mytihis cygneus. 



Linn.) 

 §Genotype, Lk. Prod. 87, is Mytihis cygneus, 

 Lin., though anatina is cited in Lk. Syst. 114. 

 Iridina 



I. exotica. §Genotype. 

 Die eras 



D. arietinum [sic] {Chama hicor- 

 nis. Brug.) 

 §Sole species, but Bruguiere's specific name hav- 

 ing priority holds, and type is Die eras bicornis 

 (Brug.). 



