TRIASSIC PERIOD. 



435 



Fig. 654. 



Lily Encrinite, Encrinus lUiiforrnis. Mollusks are numerous and 



Z°l g l)Z " thG firSt ° f thG *"""** The Articulates are 

 confined to Crustaceans and Worms. 



Among Vertebrates, the Fishes are all 

 Ganoids or Selachians. 



The Reptiles include the gigantic Labyrin- 

 thodon, a scale-covered animal of a Batrachian 

 form, the skull of which was three or four 

 feet long, and the teeth three inches,— mag- 

 nitude enough for the Otozoum of the Con- 

 necticut valley. The tracks referred to a 

 genus named Chiroiherium (because of a re- 

 semblance in form to the human hand) are 

 supposed to be those of a Labyrinthodon. 

 the rocks also contain remains of Swimming 

 Saurians (Enaliosaurs) and Lacertian Reptiles 

 Remains of 12 species of Labyrinthodonts, 16 

 of Enaliosaurs, and 12 to 15 of other Saurians, 

 have been found. 



The species of Mammal, Microlestes antiquus 

 (fig. 663 A), is closely related to that of North 



Carolina. Encrinus liliiformis. 



Characteristic Species. 



kai^T^I^'T^"- ^ EnCrl r *&*«**«* theEuropean "Muschel- 

 kalk. The limestone m some places is mostly made of Crinoidal remains. 

 Asptdura loncata is a Star-fish related to the Ophiurae. 



eJ'^i ^«^ r ^-^ e6 r«^ vuisarie, Spirifer uncinate, 

 etc. (ft.) Conifers. -Fig. 655, Avidia ? socialis. Fig. 657, MyopkoHa lineata, of 

 the Tngonia faimly ; also species of Gervillia, Avicida, Pecten, etc. (c.) Cephalopoda 



Figs. 655-657. 



CONCHIFERS.-Fig. 655, Avicula? socialis; 656, Estheria nrimita; 657, Myophoria lineata 



-Fig. 658, Ceratites nodosus, related to the Ammonites, but differing in the 

 greater simplicity of the lobes of the septa. Fig. 659, Ammonite. tomcUus, from 



