PLATE P. 



Jld^C. Jiryverfy. sc . 



l..li'ca tetragona. 1* its byf'sa] appendage. 

 2.Leda caudala. 2". its disk . 

 3. Ledapjgmaja. ^-NacuJa nucLeas. 

 5. Kucula tenuis. 6. Pec tun cuius piiosus . 



Xorbdorv,I:jiilCs%ul hy John. Tan. Tborst. 184^9 . 



