xvi Contents 



PAGE 



Arthrodires. — Suborder Cyclic. — Pakeospondylus. — Gill on PaLtospon- 

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

 quair, 1S90. Traquair, 1893. Traquair, 1S97. Smith Woodward, 1892. 

 Dawson, 1893. Gill, 1S96. Dean, 1S96. Dean, 1S98. Parker & Has- 

 well, 1897. Gegcnbaur, 1898. — Relationships of PaL-eospondylus 581 



CHAPTER XXXIV. 



THE CROSSOPTERYGII. 



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

 of Crossopterygians. — Orders of Crossopterygians. — Haplistia. — Rhipidistia. 

 — Mcgalichthyida;. — Order Actinistia. — Order Cladistia. — The Polypte- 

 ridK 598 



CHAPTER XXXV. 



SUBCLASS DIPNEUSTI, OR LUNGFISHES. 



The Lungfishes. — Classification of Dipnoans. — Order Ctenodipterini. — Order 

 Sirenoidei. — Family CeratodontidK. — Development of Neoceratodus. — Lepi- 

 dosirenidce. — Kerr on the Habits of Lepidosiren 609 



