_The Dinocerata._ By Prof. O. C. Marsh. _United States Geological Survey_, vol. x. Washington, 1884. _The Odontornithes_, a Monograph on the Extinct Toothed Birds of North America. By Prof. O. C. Marsh. New Haven, Connecticut, 1880. _The Vertebrata of the Tertiary Formations._ By Prof. E. D. Cope. Washington, 1883. _The Vertebrata of the Cretaceous Formations of the West._ By Prof. E. D. Cope. Washington, 1875. _Contributions to the Extinct Vertebrate Fauna of the Western Territories._ By Joseph Leidy. Washington, 1873. (The last three are in the reports of the _United States Geological Survey of the Territories_.) _The British Merostomata_ (Palæontographical Society). By Dr. Henry Woodward, F.R.S. Monographs by Sir Richard Owen. _A History of British Fossil Reptiles._ 4 vols. (Cassell.) (Most of which has been previously published in the _Monographs of the Palæontographical Society_.) _On the Megatherium, or Giant Ground Sloth of America._ London, 1860. _On the Mylodon._ London, 1842. _On the Extinct Wingless Birds of New Zealand._ London, 1878. Reprinted from _The Transactions of the Zoological Society_.
The student should consult the numerous papers by Prof. Marsh in _The American Journal of Science_; and by Prof. Cope in _The American Naturalist_. Many of Prof. Marsh's papers have also appeared in _The Geological Magazine_ and in _Nature_. The two latter journals contain many other valuable papers (and reviews of Monographs, etc.), too numerous to be separately mentioned. Some are referred to in the text. _The Quarterly Journal of the Geological Society_ contains many papers on Extinct Animals. See also papers in _Natural Science_ and _Knowledge_.
[Illustration: Fig. 59.--_Ichthyosaurus tenuirostris_, from Würtemberg.]
It was unfortunate that news of the highly interesting discovery at Würtemberg came too late for our artist to make a new drawing for our first edition, to show the dorsal fin and large tail-fin, etc., described by Dr. Fraas.[82] This has now been done, as shown in Plate II. By the courtesy of the proprietors of _Natural Science_, we are enabled to reproduce two drawings (Fig. 59) from the September number, illustrating a paper by Mr. Lydekker, in which he gives a _résumé_ of the latest intelligence with regard to Ichthyosaurian reptiles.