(34 



ECHINODEEMATA. 



not many years ago, the interesting discovery was 

 made of another species upon our own coasts; this, 

 however, is of very small size, not exceeding three- 

 quarters of an inch in length — with these rare ex- 



t'^m^ 



M 





Fig. 43.— fossil. 



LJLY STONES. 



ceptions, the race of Encrinites appears to be ex- 

 tinct. Yet the time has been when the bottom 

 of the sea must have been as thickly covered with 



