548 



THE WONDERS OF GEOLOGY. 



Lect. V. 



character by which it is separated alike from the vegetation 

 of the older formations below, and of the Lias above. 



8. Mollusca and Crinoidea. — Polypiferous zoophytes 

 and corals, which are so abundant in the Jurassic formation, 



Lion. 124. — The LilyEncrinite, from the Muschelkalk, near Brunswick. 



(Encrinus monileformis.) 



are very rare in the Trias. The shells comprise a few species 

 of Trigonia, Posidonomya,'* Terebratula, Avicula, Ostrea, 



* Posidonomya minuta is, I believe, the only British species. 



