300 



PALEOZOIC TIME. 

 Figs. 591-596. 



Brachiopods. — Fig. 591, Orthis Michelini, Tar. Buriingtonensis ; 592, Spiriferina octoplicata; 

 593, Spirifer bisulcatus ; 594, Retzia Verneuiliana ; 595 a, Chouetes variolata ; 596, Productus 

 punctatus. 



Figs. 597, 598. 

 597 



597, and straight-hinged species allied to Productus (of the genus 



Chonetes), in Figs. 595, 598. 



There were also many Cephalopods, of 

 the genera Goniatites and Nautilus, and 

 a few of the Orthoceras family. 



Among Articulates, Trilobites, so abun- 

 dant in earlier time, were rare fossils. 

 There must have been Insects of various 

 kinds. Fig. 599 represents a wing found 



near Paoli, Indiana; the insect was one of the four-winged kinds 



598a 



Tig. 597, Spirifer biplicatus; 598 

 598 a, Chonetes ornata. 



Fiar. 599. 



Wing of a Neuropier. — Paolia vetusta (X ■£)■ 



having net-veined wings — that is, a Neuropter ; but differed in the 

 character of the veining from ordinary May-flies, and other modern 

 kinds of the tribe. 



