ball: MACTRIDiE AND MESODESMATID^. 213 



? Subfamily A^-ATINELLIN^. 



Genus Anatinella, Sowerby, 1834. 



Type. — A. Sibbaldii, Sby. 



Family M E S DE S M AT I D^ . 



Subfamily MESODESMATIN^. 



Genus Mactkopsis, Conrad, 1854. Eocene. 

 Type. — M. (Bquorea, Conrad. 



Genus Atactodea, Dall. 



[^Paphia, Lam. ; Urycina, Sby. ; Eryx, Swainson, etc., preoccupied 

 names in Zoology.] 



Type. — Paphia glahrata, Lam. 



Genus Mesodesma, Deshayes, 1830. 

 Type. — M. donacium, Lam., sp. 



Subgenus Mesodesma, s.s. Type. — M. donacium. 



Subgenus ^ow«c«7^«(Lam.), Pbilippi,1836. Type. — M. cornetim, Poli, sp. 



Subgenus Tana, Gray, 1853. Type. — M. Stokesii, Gray. 



Subgenus Paphies, Lesson, 1830. Type. — M. aitstralis, Gmel. 



Subfamily DAVILIN^. 



Genus Davila, Gray, 1853. 

 Type. — I), polita, Gray. 



Genus Anapella, Dall. 



\_Anapa., Gray, 1853,^ non Gray, 1847.] 



Type. — Anapa triquetra, Hanley. 



Subfamily ERYILIIN^. 



Genus Ervilia, Turton, 1822. 

 Type. — Mya 7iitens, Montagu. 



Genus C^cella, Gray, 1853. 

 Type. — C Hursfieldii, Gray. 



* N.B. — The original Anapa was founded on Erycina petitiana, Rec. =Zasea rubra. 



