CO KOYAI. SOCIKTY OF CANADA 



exhibits this feature, l)ut tli'at it does not necessarily indicate generic 

 divergence is fully established l)y tlie parallel case to be met with among 

 the liigher Oonifera^ in Abiins balsamcn.' In the parenchyma cells, the 

 upper, lower and terminal walls are thin land not pitted, while the latter 

 are also generally curved as in the Cupressineie and in Araucaria. The 

 lateral w'alls are always furnished witli l)()rdered pits which are dis- 

 tinguished from those of the adjacent or underlying wood tracheid by 

 their smaller size and somewhat diiTerent details of structure, as well as 

 by their peculiar relation to the ray element itself. These pits Bre 

 found to differ very materially as between one sjiecies and another, with 

 respect to their detailed structure, disposition in the cell and number 

 within the limits of a wood tracheid. That too much dependence can- 

 not be pl'aced upon the stability of these clement.s of structure as diag- 

 nostic characters, is shown in the case of the bard pines, in which 

 group they are utterly wortliless ; but on the other hand they a.re of 

 very definite value in the soft pines and other genera of the Abietinea; 

 a.s also in the C'u])ro«sinea^* It is therefore re«sonal)le to regard them 

 as of possible importance in the present case. 



The structure of the bark has received very little consideration in 

 published descriptions. Two species in the present list — C. Brand- 

 lingii and C. hnmiltonense — embrace a thick l>ark which is well pre- 

 served, and in the latter the stnu'tural details are so well defined that 

 they will be discussed under the species. 



CoKDAi'PES. Unger. 



Bib. :— Dana, Man. of Geol., 1875, 349, 371; Nicholson, Man. of Pal., 1879, II., 

 436. 437, 446, 448, 461, 462; Lesquereux, 2(1. Geol. Surv. of Pa., 1880, 

 419, 543; and 1884, 419, 543; Unger, Gen. et Spec. PI. Fos^ . Vienna, 

 1850, :f7s-381; Laeoe, Cat. of the Pal. Foss. PI. of N. A., 1884; Dawson, 

 Q. Jn'l Geol. Soc, 1883, 460; Carruthers, Geol. Mag., V., 1868, 8; 

 "Williamson, M. Mic. Jn'l, 1869, 66; Lesquereux, U. S. Geol. Surv., 1876, 

 1-16; Lesquereux, Proc. Am. Phil. Soc, 1878, 324; Dawson, Q. Jn'l 

 Geol. Soc., 1874, 215; Williamson, Mem. Manch. Lit. & Phil. Soc., 

 X., 1885-1886, 190; Renault, Coum de Bot. Foss., 1881, Pis. 12 & 13; 

 Brongniart, Tab. des Gen. de Veg. Foss., 1849, 76, 97; Zittell, Schim- 

 per & Schenk, Handb. der Pal., 1890, 865. 870; Knowlton, Am. Geol., 

 III., 1889, 106; Knowlton, U. S. Geol. Sui-v., 1889, 30, 50; Grand 'Eury, 

 Geol. et Pal. du Bass. Houil. du Gard, 1890, 316; Schimper, Pal. Veg., 

 1869, II., 380; Dawson, Geol. Surv. Can., 1882, 124-125; Dawson, Geol. 

 Surv. Can., 1873, 15; Grand 'Eury, Flor. Garb, du Dept. de la Loire, 



' Penhallow, Taxaceae and Coniferae, Trans. R. Soc., Can., 1896, II., iv. 

 = Trans. R. Soc. Can., 1896, II., iv., 33-54. 



