54 ROYAL SOCIETY OF CANADA 
angles by transverse thin lines; intermedial veinlets numerous 
(10 — 13 ,” cannot apply to Typha. The “ transverse thin lines ” here 
referred to as connecting the nerves and crossing the 10 — 13 “ inter- 
medial veinlets” cannot be interpreted as ordinary cell walls, but 
they must obviously be regarded as cellular partitions, the spaces 
between which are air chambers; the entire structure is therefore of 

- 
Bia. 5.—MAJANTHEMOPHYLLUM GRANDIFOLIUM. 
ME ete ee 
that type which is not uncommon in aquatics, and in the broad sheath- 
ing petioles of Sagittaria, the characteristics of Typha latissima are 
very nearly represented. 
MAJANTHEMOPHYLLUM GRANDIFOLIUM, D.sp. 
Eocene of the Red Deer River, N.W.T. 
Leaf broadly ovate, about 9-5 cm. wide, and 11-2 em. long from 
the base of the sinus to the apex; apex acute; margin entire; obscurely 
