A Guide to the Study of Fishes, Volume 1 (of 2)
CHAPTER XXXIII.
ARTHRODIRES.
The Arthrodires.--Occurrence of Arthrodires.--Arthrognathi.--Anarthrodira.--Stegothalami.-- Arthrodira.--Temnothoraci.--Arthrothoraci.--Relations of Arthrodires.--Suborder Cycliæ.--Palæospondylus.--Gill on Palæospondylus.--Views as to the Relationships of Palæospondylus: Huxley, Traquair, 1890. Traquair, 1893. Traquair, 1897. Smith Woodward, 1892. Dawson, 1893. Gill, 1896. Dean, 1896. Dean, 1898. Parker & Haswell, 1897. Gegenbaur, 1898.--Relationships of Palæospondylus 581