BTSS AKODOKTA. 



87 



X. SUBGENUS BYSSANODONTA/ 



QUADEATE. 



Paranensis. D^Orh. Chenu. 



• This is a remarkable fresh water bivalve discovered by M. D'Orbigny, remaining always attached 

 by a byssus. See Voy. dans I 'Avier. 3Ierid. 



