THE TRIASSIC PERIOD. 209 



on the continent of Europe, and from the St Cassian and 

 Rhaetic beds still higher in the series; whilst some of the 



Fig. 141. Triassic Conifers and Cycads. a, Voltzia (Schizoneura) heterophylla, por- 

 tion of a branch, Europe and America ; b, Part of the frond of Pterophyltum Jageri, 

 Europe ; c, Part of the frond of Podozamites lanceolatus, America. 



Triassic strata of California and Nevada have likewise yielded 

 numerous remains of marine Invertebrates. The Protozoans 

 are represented by Foraminifera and Sponges, and the Coelcn- 

 terates by a small number of Corals ; but these require no 

 special notice. It may be mentioned, however, that the great 

 Palaeozoic group of the Ritgose corals has no known repre- 

 sentative here, its place being taken by corals of Secondary 

 type (such as Montlivaltia, Synastrcea, &c.) 



The Echinodenns are represented principally by Crinoids, 

 the remains of which are extremely abundant in some of the 

 limestones. The best -known species is the famous " Lily- 

 Encrinite " (Encrinus liliifonnis, fig. 142), which is character- 



