Plate XX 
Figure 1. 
(Page 121.) 
Figure 2. 
Figure 3. 
Figure 4. 
Figure 5. 
Inoceramus pontoni n. sp. 
Anterior view of holotype. Viet. Mem. Mus., Cat. No. 6103. Natural scale. 
Same specimen, side view. Natural scale. (Page 121.) 
Inoceramus albertensis n. sp. 
Left valve. Holotype, X Viet. Mem. Mus., Cat. No. 6107. (Page 123.) 
Same specimen. Anterior view, X §. (Page 123.) 
Inoceramus dunveganensis n. sp. 
Right valve, X j. Holotype. Viet. Mem. Mus., Cat. No. 6106. (Page 122.) 
