THE ANNALS 



AND 



MAGAZINE OF NATUEAL HISTOEY. 



[SEVENTH SERIES.] 

 No. 77. MAY 1904. 



XXXIX. — Tlte Phylogemj of the Tdeostoini. 

 By C. Tate Keg an, B.A. 



[Plate VII.] 



In tlie following paper I have tried to give an account of the 

 phjlogeny of tlie main groups of tlie Teleostomi, based on 

 the evidence of the available morphological data, la forming 

 my conclusions I have been helped by criticism and advice 

 from Mr. Boulenger and Dr. \V. G. Ridewood, to both of 

 whom I gratefully express my acknowledgments. I trust 

 that the reasons given for differing from the classifications 

 hitherto proposed will prove sufficient: the aim of this paper 

 is constructive rather than destructive, and I have not thought 

 it necessary in every case to give all the avaihible arguments 

 against theories of relationship which I do not accept, but 

 have rather tried to establish the ideas of phylogeny which 

 are here put forward on a sound morphological basis. 



The class Pisces, as usually understood, comprises Verte- 

 brates with jaws, with gills supported by visceral arches, and 

 with paired limbs in which the endoskeletal supports have 

 not yet attained the pentadactjle arrangement of higher 

 Vertebrates. Two subclasses may be recognized — Chondro- 

 pterygii and Teleostomi. The latter are distinguished by the 



Ann. & Mag. N. Hist. Ser. 7. Vol. xiii. 22 



