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. Trias<iic Conifers and Cycads. a, Voltzla (Schizoneura) heterophylla, por- 

 tion of a branch, Europe and America ; b, Part of the frond of Pterophylium Jtegeri, 

 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 Ccelen- 

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

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

 Palaeozoic group of the Rugose 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 liliiformis, fig. 142), which is character- 



