Introduction Fossil remains assigned by investigators to Artocarpus first appear the Cretaceous of Greenland. They were described by NATHORST (I2) and consisted both of leaves and of parts of the fruit. About twenty-five years earlier, however, LESQUEREUX had described from the Laramie beds of Boulder County, Colorado, certain huge leaves as Myrica (?) lessigniana (9) and Myrica (?) lessigii (io). The latter specific name is apparently an error of LESQUEREUX'S. NATHORST pointed out that these leaves were reality those of Artocarpus. KNOWLTON (5) transferred both of LESQUEREUX'S forms to Artocarpus lessigniana (Lesquereux) LESQUEREUX (ii) recorded from the Denver formation at Golden, Colorado, other leaves as Aralia pungens. Leaves similar to these were discovered by HOLLICK (4) beds of the lower Eocene Louisiana. Like NATHORST, he recognized their true affinity and recorded them as Artocarpus pungens (Lesquereux) Hollick. In addition, HOLLICK records a new species, Artocarpus dubia, from the same beds, a red sandstone, one-fourth of a mile above Coushatta. In his notes he states, may be merely a young or small leaf of Artocarpus lessigniana (Lesquereux) Knowlton. This surmise is correct. HOLLICK records Artocarpus lessigniana from beds near Shreveport the same state. BERRY (2) redescribed these three species from various localities the Embayment province, and made the same notation regarding A. dubia as that of HOLLICK already quoted. KNOWLTON (6) has a species, Artocarpus similis, which he states is, in a way, intermediate between A. lessigniana and A. pungens. .... The differences separating the three are not very marked, and it is quite possible that with a fair series of specimens, they might