46 
Case 111. 
Case 112. 
lying on the original hardened sea-mud as found 
in the cliffs at Bridport, England. The “ devil’s 
toe-nail ” (Gryphaea), the slit-band Snail (Pleuro- 
tomaria), and an Ammonite with the mouth-closing 
operculum (aptychus) in position, form other inter- 
esting exhibits. 
Fig. 45. A Brittle-star from the Lias of Dorset — 
Ophioderma egertoni (Broderip). 
Amongst the plants of the Trias are the ancestors of the 
living Horse-tails (Equisetum), and some ancient 
types of Fern-palms (Otozamites and Ptero- 
phyllum). The handsome Stone-lily (Encrinus) 
from Brunswick, Germany, and a Nautilus ( N . 
sau'peri) from Austria showing pearly lustre after 
many aeons, are worth noting. 
Club-mosses, Fern stems and Coniferous wood, some 
of which are shown in polished slices, form an 
interesting exhibit in this Permian series ; and 
from the same formation are marine representatives : 
Corals, Lamp-shells, Molluscs, and Fishes, the latter 
group including a spine-bearing Shark, Acanthodes, 
only five inches long. In the same case are several 
beautifully preserved stems and branches of 
Carboniferous trees belonging to the Horse-tail 
