352 



STRATIGRAPHICAL GEOLOGY 



parts of the German Trias, and closely resemble those of the living 

 species of that genus. 



Amphibia are still represented by Labyrinthodonts, the chief 

 genera being Labyrinthodon, Mastodonsaurus, and Trematosaurus, 

 but this order does not survive the Triassic period. Their tracks 

 are five-toed, like the rough impress of a man's hand. 



Reptilia. Remains of true reptiles also occur, and include no 



Fig. 113. GROUP or GERMAN MUSCHELKALK FOSSILS. 



a. Encrinus liliiformis. 



ft. Terebratula (Ccenotliyris) vulgaris. 1 



c. Gervillia (Hoernesia) socialis. 



d. Myophoria vulgaris. 



e. Temnocheilus bidorsatus. 

 /. Ceratites nodosus. 



fewer than seven orders, several of which attained their maximum 

 development in the succeeding Jurassic period. The Sauropterygia 

 are represented by Nothosaurus, the Ichthyosauria by Mixosaurus, 

 and the crocodiles by Stagonolepis, Erpetosuchus, Ornithosuchus, and 

 Belodon. Dinosaurs occur for the first time in the forms known as 

 Palceosaurus, Zanclodon ( = Teratosaurus), Thecodontosaurus, and 

 Cladyodon. Most of these creatures appear to have walked on their 

 hind feet, after the fashion of a kangaroo ; and as some of them 



