PELVIC GIRDLE AND FIN OF EUSTHENOPTERON. 323 



terygii a great and increasing modification in structure of 

 the fins. All trace of an axis is soon lost in the pelvic limb, 

 whilst at the same time the pelvic girdle bones in these fish 

 and the Coelacanthidae, assume that peculiar elongated and 

 flattened shape, widening out in front, which is so charac- 

 teristic. 



Finally it may be pointed out that, whilst Eusthenopteron 

 is undoubtedly closely allied to tlie Rhizodontidge, judging 

 from the skeleton of the pelvic fin, it appears to be very far 

 removed from Polypterus, which probably belongs to the 

 Actinopterygian line of development. 



List of Rrferences. 



1. 15alfour, F. — ' Compurative Kmbiyology,' voL ii. 



2. CoFK, E. D. — ' froc. W. S. Nat. Museum,' vol. xiv. 



3. Fritscii, a.— ' Fauna der Gaskolile,' Prague, vol. ii, ISS'J. 



4. Gkgenbaur. C. — ' Vergl. Anatotnie der Wirbellliiere,' vol. i, Leipzig, 



1898. 



5. MiALL, Ij. C. — 'Quart. Journ. Geo!. Soc.,' vol. xl, p, 34-7. 



6. MoLLiEK, S.— "Die paarigeu Extremitaten," 'Anat. Hefle,' vol. i, 1893. 



7. Traquaih, 1{. n. — '• Devonian Fislies of Canad;i," 'Geol. Mag.,' vol. vii, 



1890. 



8. Eautenfklt), E. V. — " Ucber das Skclet der liintoren Giiedmassen," 



'Inang. Dissert. Dorpat,' 1882. 



9. AYelli?ukn, E. D. — " On the Genus Megaliclil.livs," ' Proc. Yorks. Geol. 



and Polvt.. Society,' vol. xiv, 1900. 



10. WiiiTEAVES, J. F. — "The Foesil Fishes of the Devonian Rocks of 



Canada," 'Trans. Roy. Soc. Canada,' vol. iv, 1SS7, and vol. vi, 1888. 



11. WiEDERSHF.ni, R. — "Das Gliedniassenskelet der "Wirbellliiere," Jenn, 



1892. 



12. ■\VooDAVARi), A. S. — 'Pritisli Museum Catalogue of Fossil Fishes,' pf. 2, 



1891. 



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