THE SILURIAN STRATA PROPER. 
41 
were not so well preserved as the animals. On the 
land a few ferns and club mosses began to form a 
brownish-green covering. 
There was no rising sun. His light, no doubt, 
glimmered through the misty atmosphere, distin¬ 
guishing night from day. But there were no waving 
Fig. 21.—The nautilus. A cross-section, showing the chambers 
and the animal in the shell. 
trees, no beautiful flowers, no croaking frogs, no 
singing birds, no climbing monkeys; and why should 
there have been ? The world was silent as the deep 
except for earthquake rumblings. There was no eye 
for beauty, no ear for song, no taste for delicious fruits. 
