228 DINOSAURS OF NORTH AMERICA. 



Camptosaurus, Claosaurus, Stegosaurus, and Triceratops, each have 

 teeth of a distinct type, yet it seems possible to trace the gradation of 

 one to tbe other through different intermediate forms. In Triceratops 

 the teeth have two distinct roots, a feature unknown in any other rep- 

 tiles, living or extinct, but characteristic of mammals. 



The series of pubic bones of herbivorous dinosaurs shown on PI. 

 LXXIX is especially instructive, as they indicate how the anterior and 

 posterior elements of the pubis may vary in the Predentata, and thus 

 afford good characters for classification. The same is true, but in a 

 less degree, of the ischia represented on PI. LXXX, which all pertain 

 to one group of dinosaurs. The comparison may even be carried much 

 further, as in the two other orders (the Theropoda and Sauropoda) 

 some families have ischia of the type here represented, as shown on 

 Pis. XXVIII and XXXV. 



The pelves represented on PI. LXXXI, pertaining to the three pre- 

 dentate genera, Camptosaurus, Triceratops, and Stegosaurus, will sup- 

 plement the facts presented on the two preceding plates. The series 

 might be much further extended, and prove equally instructive. This 

 will be done by the writer in the monographs now in preparation, as in 

 these the whole subject of diuosaurian reptiles will receive careful con- 

 sideration. 



RESTORATIONS OF EUROPEAN DINOSAURS. 



The remaining restorations of dinosaurs in this paper are four in 

 number, and represent some of the best-known European forms, types 

 of the genera Compsognathus, Scelidosaurus, Ilypsilophodon, and 

 Iguanodon. These outline restorations have been prepared by the 

 writer mainly for comparison with the corresponding American forms, 

 but in part to insure, so far as the present opportunity will allow, a 

 more comprehensive review of the whole group. The specimens restored 

 are all of great interest in themselves, and of special importance when 

 compared with their nearest American allies. 



COMPSOGNATHUS. 



Plate LXXXII. 



The first restoration, that of Compsognathus longipes Wagner, 1861, 

 shown one-fourth natural size on PI. LXXXII, is believed to repre- 

 sent fairly well the general form and natural position, when alive, of 

 this diminutive carnivorous dinosaur that lived during the Jurassic 

 period. The basis for this restoration is (1) a careful study of the type 

 specimen itself, made by the writer in Munich in 1881; (2) an accurate 

 cast of this specimen, sent to him by Professor von Zittel; and (3) a 

 careful drawing of the original, made by Krapf in 1887. The original 

 description and figure of Wagner (Bavarian Academy of Sciences, 1861), 

 and those of later authors, have also been used for some of the details. 



