PLATE 29 



Patagonacy there ? nidulus sp. nov. 



Specimens showing exaggerated normal pores after being cleaned in the 



ultrasonic vibrator. 



Figs. 1,2. 1, Internal view to show radial pore canals, x 160 ; 2, Dorsal view of hinge, 



X 150. Left valve female. Paratypes, Io. 3097. Upper Chocolate Clays (upper part), sample 



24170, Zao River. 



Fig. 3. Dorsal view of hinge, right valve female, X 150. Paratype, Io. 3098. Upper 

 Chocolate Clays (upper part), sample 24170, Zao River. 



Fig. 4. Muscle scars X 260. Right valve male. Paratype, Io. 4295. Upper Chocolate 

 Clays (upper part), sample 34170, Zao River. 



Phalcocythere horrescens (Bosquet) gen. nov. 

 Fig. 5. Anterior radial pore canals, x 212. Left valve. Io. 4257. Lutetian IV (sample 

 CAB 1002, Keij 1957, P- IQ )» Grignon, Paris Basin. 



