EXPLANATION OF PLATE XXIV. 



Page. 



Fig. 1, I'teuostrobus nebrascensis, sp. uov 114 



Fig. 2, Liquidambar integrifolium, Lesqx 5G 



Fig. 3, Greviopsis haydenii, sp. nov 97 



Fig. 1 Populites cyclopbylla ?, Heer 59 



