CARBONIFEROUS AGE. 



Figs. 587 a, b. 



299 



587a 



ECHisorDS. — Fig. 5"7 a, Melonites multipora (X 2), side view, showing a portion of one of the 

 ambulacral series of plates; 587 b, Oligoporus Danoe (X 2), id. 



Among Mollusks, there were the coral-making, auger-shaped Rete- 

 pores, called Archimedes, belonging to the order of Bryozoans. The 

 cells, in which the animals were, are represented of natural size, in 



589« 





Poltp-coral. — Fig. 588, Portion of the Coral, Lithostrotion Canadense ; 588 a, vertical view of 

 the same. Bryozoan. — Figs. 589 a, b, 590, Archimedes Wortheni.' 



Fig. 589 b, showing a portion of the under surface of the expanded 

 frond of the screw-shaped coral. 



Besides these, Brachiopods were numerous, especially of the genera 

 Spirifer and Productus. One of the Spirifers is represented in Fig. 

 593, and a common Productus in Fig. 596 ; another Spirifer in Fig. 



