"The flora of the Amboy clays is closely related to that of the Dakota group--most of the genera and some of the species being identical--so that we may conclude they were nearly contemporaneous, though the absence in New Jersey of the Fort Benton and Niobrara groups of the upper Missouri and the apparent synchronism of the New Jersey marls and the Pierre group indicate that the Dakota is a little the older. "At least one-third of the species of the Amboy clays seem to be identical with leaves found in the Upper Cretaceous clays of Greenland and Aachen (Aix la Chapelle), which not only indicates a chronological parallelism, but shows a remarkable and unexpected similarity in the vegetation of these widely separated countries in the middle and last half of the Cretaceous age. The botanical character of the flora of the Amboy clays will be seen from the following brief synopsis: "_Algæ._--A small and delicate form, allied to Chondrites. "_Ferns._--Twelve species, generally similar and in part identical with those described by Heer from the Cretaceous beds of Greenland, and referred to the genera _Dicksonia_, _Gleichenia_, and _Aspidium_. "_Cycads._--Two species, probably identical with the forms from Greenland described by Heer under the names of _Podozamites marginatus_ and _P. tenuinervis_. "_Conifers._--Fourteen species, belonging to the genera _Moriconia_, _Brachyphyllum_, _Cunninghamites_, _Pinus_, _Sequoia_, and others referred by Heer to _Juniperus_, _Libocedrus_, _Frenelopsis_, _Thuya_, and _Dammara_. Of these, the most abundant and most interesting are _Moriconia cyclotoxon_--the most beautiful of conifers--and _Cunninghamites elegans_, both of which occur in the Cretaceous clays of Aachen, Prussia, and Patoot, Greenland. The _Brachyphyllum_ was a large and strong species, with imbricated cones, eight inches in length. "The angiosperms form about seventy species, which include three of _Magnolia_, four of _Liriodendron_, three or four of _Salix_, three of _Celastrophyllum_ (of which one is identical with a Greenland species), one _Celastrus_ (also found in Greenland), four or five _Aralias_, two _Sassafras_, one _Cinnamomum_, one _Hedera_; with leaves that are apparently identical with those described by Heer as belonging to _Andromeda_, _Cissites_, _Cornus_, _Dewalquea_, _Diospyros_, _Eucalyptus_, _Ficus_, _Ilex_, _Juglans_, _Laurus_, _Menispermites_, _Myrica_, _Myrsine_, _Prunus_, _Rhamnus_, and others not yet determined. "Some of the Aralias had palmately-lobed leaves, nearly a foot in diameter, and two of the tulip-trees (_Liriodendron_) had leaves quite as large as those of the living species. One of these had deeply lobed leaves, like those of the white oak. Of the other, the leaves resembled those of the recent tulip-tree, but were larger. Both had the peculiar emargination and the nervation of _Liriodendron_.