12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 



Type & Synonym 



U. smiiata {My a margaritifera ? 

 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. siuuata, Lamk. [^aitricii- 

 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. avicularis {Mya syrmatoplioraf 



Gmel.) 

 §The identity of avicularis with syrmatophora 

 being doubtful Children's selection stands 

 though Herrmannsen favors the latter. 

 [Generic name preceded by Paxyodon, Schu- 

 macher, 18 1 7.] 



25 51 Anodonta 



26 52 A. cygneits (Mytilns cygneus. 



Linn.) 

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

 Lin., though auatina- is cited in Lk. Syst. 114. 

 Iridina 



I. exotica. §Genotype. 

 Die eras 



D. arietinnni [sic] (CJiania bicor- 

 nis. Brug.) 

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

 ing priority holds, and type is Diceras bicornis 

 (Brug.). 



