218 LAY SERMONS, ADDRESSES, AND REVIEWS, [£, 



guishable from that of an existing species ; that a true 

 Pinus appears in the Purbecks, and a Jaglans in the 

 Chalk; while, from the Bagshob Sands, a BanJcsia, the 

 wood of which is not distinguishable from that of species 

 now living in Australia, had been obtained. 



Turning to the animal kingdom, he affirmed the tabu- 

 late corals of the Silurian rocks to be wonderfully like 

 those which now exist ; while even the families of the 

 Aporosa were all represented in the older Mesozoic 

 rocks. 



Among the Mollusca similar facts were adduced. 

 Let it be borne in mind that Avicida, My tails, Chiton, 

 Natica, Patella, Trochus, Discina, Orbicula, Lingula, 

 RhynchoneUa, and Nautilus, all of which are existing 

 genera, are given without a doubt as Silurian in the 

 last edition of " Siluria ; " while the highest forms of 

 the highest Cephalopods are represented in the Lias by 

 a genus, Belemnoteuihis, which presents the closest rela- 

 tion to the existing Loligo. 



The two highest groups of the Annulosa, the Insecta 

 and the Arachnida, are represented in the Coal, either 

 by existing genera, or by forms differing from existing 

 genera in quite minor peculiarities. 



Turning to the Vertebrata, the only palaeozoic Elas- 

 mobranch Fish of which we have any complete know- 

 ledge is the Devonian and Carboniferous P I eur acanthus, 

 which differs no more from existing Sharks than these 

 do from one another. 



Again, vast as is the number of undoubtedly Ganoid 

 fossil Fishes, and great as is their range in time, a large 

 mass of evidence has recently been adduced to show that 

 almost all those respecting which we possess sufficient 

 information, are referable to the same sub-ordinal groups 

 as the existing Lepidosteus, Polypterus, and Sturgeon ; 

 and that a singular relation obtains between the older 



