C. J. Hylander — Mid-Devonian Callixylon. 321 



C. Newberryi (2). A form Ormoxylox (2) is given with 

 three pit rows, as having very narrow wood rays one cell 

 thick, but this is more likely a typical Dadoxylon. 



Literature cited. 



Chamberlain, C. J.: Growth Kings in a Monocotyl, Bot. Gaz., 72, 293- 

 304. Text fig. 1-16, 1921. 



- Dawson, J. W. : Fossil Plants of the Devonian and Upper Silurian of 

 Canada, 92 pp., 20 pis., Geol. Surv., Canada. Montreal, 1871. 



3 Elkins, M. G., & Wielaxd, G. E. : Cordaitean Wood from the Indiana 

 Black Shale, this Journal, 38: 65-78. pi. 1, 2, 1914. 



4 Goldring, W. : Annual Rings of Growth in Carboniferous Wood, Bot. 

 Gaz., 72, 326-330, 1921. 



5 Penhallow, D. P. : Notes on the North American Species of Dadoxylon, 

 Trans. Roy. Soc. Canada, 6, IV, 61, 1900. 



6 Wieland, G. R. : Flora Liasica de la Mixteca Alta, Inst. Geol. Mex., 

 Bol. 31, 1914. 



7 Zalessky, M. D. : Etude sur l'anatomie du Dadoxylon Tehihatcheffi 

 GSppert sp. Mem. du Comite Geol. Nouvelle Ser. Liv. 6S, pp. 18-29, Pis. 

 I-IV, St. Petersburg, 1911. 



Osborn Botanical Laboratory, 

 Yale University. 



