xvi Contents 



PAGE 



Arthrodires. Suborder Cycliae. Palaeospondylus. Gill on Palaeospon- 

 dylus. Views as to the Relationships of Palaeospondylus: Huxley, Tra- 

 quair, 1890. Traquair, 1893. Traquair, 1897. Smith Woodward, 1892. 

 Dawson, 1893. Gill, 1896. Dean, 1896. Dean, 1898. Parker & Has- 

 well, 1897. Gegenbaur, 1898. Relationships of Palaeospondylus 581 



CHAPTER XXXIV. 

 THE CROSSOPTERYGII. 



Class Teleostomi. Subclass Crossopterygii. Order of Amphibians. The Fins 

 of Crossopterygians. Orders of Crossopterygians. Haplistia. Rhipidistia. 

 Megalichthyidae. Order Actinistia. Order Cladistia. The Polypte- 

 ridae 598 



CHAPTER XXXV. 



SUBCLASS DIPNEUSTI, OR LUNGFISHES. 



The Lungfishes. Classification of Dipnoans. Order Ctenodipterini. Order 

 Sirenoidei. Family Ceratodontidae. Development of Neoceratodus. Lepi- 

 dosirenidae. Kerr on the Habits of Lepidosiren 609 



