: we 3 : 
"PSEUDOB ORNIA " SPHENOPHYLLUM CAL ITES 
DEVONIAN DEVONIAN TO TRIASSIC CARBONIFEROUS TO TRIASSIC 
HORSETAIL GROUP 
— 
Fic. 7. Imaginary landscape, showing ancestral forms (reconstructed) of the modern 
This is one of eight transparencies to be installed in the Conservatories. (7015.) 
qorsetails (/qutsetiuim). 
