396 tellinin^e. 



Sub -gen. peronjeoderma, Morch. 



Shell oval, compressed, posterior side acuminate. Hinge 

 with two lateral teeth in one valve. 



albinella, Lam. plectrum, Hanley. 



alternata, Say. princeps, Hanley. 



Amboynensis, Desk. prora, Hanley. 



Broderipii, Desk. punicea, Born. 



eburnea, Hanley. regia, Hanley. 



Hanleyi, Desh. rubescens, Hanley. 



inrequistriata, Donov. Sowerbyi, Hanley. 



laceridens, Hanley. striata, Chem. 



Sub-gen. mcera, H. and A. Adams (Donacilla, Gray, not Lam.). 



Shell oblong, posterior end short and wedge-shaped. Hinge 

 with two lateral teeth in one valve. 



distorta, Poll, rhomboides, Qnoy and Gaim. 



donaciformis, Desh. semen, Hanley. 



donacilla, Cpr. silieula, Desh. 



donacina, Linn. tulipa, Hanley. 



Gouldii, Hanley. virgulata, Hanley. 

 pygmsea, Phil. 



Sub-gen. arcopagia, Leach. 



Shell ovate or orbicular, posterior side rounded. Hinge with 

 two lateral teeth in one valve. 



ampullacea, Phil. cyrenoidea, Hanley. 



balaustina, Linn. decussata, Lam. 



capsoides, Lam. disculus, Desh. 



carnicolor, Hanley. discus, Hanley. 



casta, Hanley. fabagella, Desh. 



concentrica, Gould. fausta, Donov. 



crassa, Penn. Gargadia, Linn. 



cuspidata, Desh. fimbriata, Hanley. 



