178 WALKS AND TALKS. 



some Labyrinthodonts the head and some other parts of the 

 body were covered with sculptured bony plates. 



Numerous remains of smaller Amphibians are found in 

 Nova Scotia, in company with numerous snail shells, in the 

 stump of an old SigiUaria. In the same situation were found, 

 also, galley-worms, scorpions, and spiders. These, undoubt- 

 edly, all served as food for the Amphibians. Nearly all the 

 forms of insect life are represented among the relics of the 

 coal epoch myriapods of various groups, scorpions and spiders, 

 cockroaches, dragon-flies and other netted winged insects, and 

 also a few beetles. But we find no remains of the highest 

 insects flies, butterflies, ants, wasps, and bees. Many insect 

 forms discovered are aquatic, and undoubtedly served as food 

 for fishes and Amphibians. 



If we examine the limestones associated with other strata 

 in the Coal Measures, especially from Ohio westward, we find 

 them stocked with a rich and varied fauna of marine remains. 

 Besides numerous tribes and genera of sharks and ganoid 

 fishes, these limestones abound in corals, crinoids and various 

 families of univalve and bivalve molluscs. Oysters, however, 

 are almost or totally wanting ; and no fish remains resembling 

 the modern perch and whitefish occur. There is a strikingly 

 antique aspect to these relics. The affinities are with the old 

 forms which we shall next discover, and not with the forms 

 of the modern world. We have here penetrated to the records 

 of the Palaeozoic JEon. 



XXXI. TERRIBLE KlSHES AND THEIR COM- 

 PANIONS. 



REMAINS OF THE DEVONIAN AGE. 



WE now descend another stage in our examination of the 

 strata and their contents. We come down to the Devonian 

 System. Do not think these rocks are everywhere covered by 

 all the later ones. In many regions they come to the surface 

 because none of the later ones are there present. But where 



