74 ROYAL SOCIETY OF CANADA 
Bordered pits in a single row, compact, large, compressed and 
transversely oval or oblong, 15.6 x 22 mic., the orifice very variable 
from oblong to round, often eccentric, but typically round and cen- 
tral. When distant, the pits are round and smaller. 5 
Tangential—Rays medium, 1-2 seriate, the very broad cells 41 mic., thin- 
walled, round and squarish. 
In addition to the material thus far described, there are several 
species from the Prosser and Dawson collections which cannot be 
brought under Cordaites, but which must fall under other genera in 
accordance with the classification adopted. These are dealt with in the 
following descriptions. 
CorpaiTes Hau, Dn. 
Bib. :—Quart. Jn’l Geol. Soc., 1862, 298, 306; Dawson, Foss. Pl. of the Dev. & 
U. Sil. Form. of Canada, 1871, 14; Proc. U.S. Nat. Mus., 1890, XII., 606. 
Middle Devonian of Ontario County, New York. 
The material from which the original description was obtained is 
in a pyritised state and therefore extremely unsatisfactory, inasmuch 
as such characters as were secured, were derived from an opaque object. 
As it is impossible to secure better material at present, the original diag- 
nosis is repeated here tentatively. 
‘“ Wood cells very large, with five rows of contiguous, alternate, hexagonal 
areoles. Medullary rays frequent, and with as many as thirty rows of cells 
superimposed.” 
DADOXYLON ANTIQUUM, Dn. 
Bib. :—Quart. Jn’] Geol. Soc., 1866, XXII., 146; Can. Nat., VIII., 1863, 433 ; 
Foss. Pl. of the L. Carb. of Can., Dawson, 1873, 17; Knowlton, Foss. 
Woods & Lig. of the Pot. Form., 1889, 37 & 52, and Proc. U. S. Nat. 
Mus., 1890, XII., 611; Acad. Geol. ed. 3, 1878, 473. 
Dist. :—L. Coal Measures, Horton, N.S. 
This plant represents a type which cannot well be referred to any 
existing form. It is among the earliest of this group described by Sir 
William Dawson who stated that it belongs to the type represented by 
the Palæoxylon of Brongniart, Pinites Withami, L. and H.,* and the 
Pissadendron of Endlicher? While it presents several features com- 
mon to Cordaites, its chief peculiarity lies in the multiseriate medullary 
rays. 

1 Int. Struct. of Foss. Veg., 1833, 72. 
? Schimper, Pal. Veg., 370 & 384. 

ba aff nn be le ee tn. 
. 
