DEVONIAN AGE. 



273 



Among the Articulates, there were species of Trilobites, one of 



Figs. 544-547. 



Conchifers. — Fig. 544, Orthonota undulata (X f); 545, Pterinea flabella (X h) i 546, Grammysia 

 bisulcata; 547, Microdou bellistriatus. 



which is represented in Fig. 549, and the tail portion of another in 



Figs. 548-550. 



Fig. 550 A. 



Cepbaiopod. — Fig. 548, 548 a, Goniatites Marcellensis. Trilobites. — Fig. 549, Phacops bufo; 

 550, Caudal extremity of Dalmanites calliteles. 



550. There were also the earliest yet discovered of the remains of 

 Insects, obtained at St. John, N. B. 

 They are the wings of Neuropterous 

 Insects, and one of these is repre- 

 sented in Fig. 550 a — the Plate- 

 phemera antiqua of Scudder. It is 

 related to the Ephemerce or May-flies, 

 species whose larves live in the water, 

 and which frequent moist places, and 

 therefore stood a good chance of be- 

 coming preserved as fossils. 



It was a gigantic species, measuring five inches in spread of wings. 

 One species has what appears to be a stridulating organ, according to 

 18 



Platepbemera antiqua. 



