860 DR RAMSAY H. TRAQUAIR ON FOSSIL FISHES COLLECTED BY THE 



Orel er — Osteostraci. 



Fam i 1 y — A teleaspidcB. 



6. Ateleaspis tessellata, Traq., — Downtonian. 



Order — Anaspida. 



Fam i ly — Bit -keniidce. 



7. Birkenia elegans, Traq., — Ludlow and Downtonian. 



8. Lasanius prdblematicus, Traq., — Downtonian. 



And whether the views which I have expressed regarding the phylogcny and 

 classification of these and allied forms be adopted or not by subsequent writers, it 

 cannot, I think, be denied that these recent discoveries by the Geological Survey have 

 opened out a new vista in the field of palaeozoic ichthyology. 



I must conclude by thanking the Director-General of the Geological Survey for his 

 kindness in submitting this very important collection to me for description, and the 

 officers of his staff for the friendly courtesy and readiness with which they afforded me 

 every facility for its examination. 



LIST OF WORKS REFERRED TO. 

 [The undernoted writings are referred to in the text by small Roman numerals.] 



1. Agassiz, L. — "Recherches sur les Poissons Fossiles." Neuchatel, 1833-43. 



2. Agassiz, L. — " Monographie des Poissons fossiles du vieux Gres rouge." Neuchatel and Soleure, 

 1844. 



3. Ai.th, A. v. — " Ueber die palseozoischen Gebilde Podoliens und deren Versteincrungen," Abb. der 

 k. /<•. geolog. Reichsanst, Bd. vii. Heft 1 . Wien, 1874. 



4. Alth, A. v. — "Ueber die Zusammengehorigkeit der den Fischgattungen Pteraspis, Cijathaspi*. 

 und Scapihaspns zugeschriebenen Schilder," Beitr, Palceont. Oesterreich-Ungarns, vol. v., 1886. 



5. Claypole, E. W.— "On the Structure of the American Pteraspidian, Palaiaspis (Claypole) : with 

 Remarks on the Family," Qu. Jonrn. Geol. Soc, vol. xlviii., 1892, pp. 542-5G1. 



G. Cope, E. D. — "Synopsis of the Families of Vertebrata," Anieric. Naturalist, vol. xxiii., 1889, pp. 

 849-877. 



7. Cope, E. D. — " On the Phylogeny of the Vertebrata, 1 ' Proa. Amer. Pliilos. Soc, vol. xxx., 1892, pp. 

 278-281. 



8. Dean, B.— "Fishes, Living and Fossil." New York, 1895. 



9. GUrich, G. — "Ueber Placodermen und andere devonische Fischreste im Breslauer Mineralogischen 

 Museum," Zeitschr. der deutechen geol. Gesellschaft, vol. xliii., 1891, pp. 902-913. 



10. Howes, G. B. — "On the Affinities, Inter-relationships, and Systematic Position of the Marsipo- 

 branchii," Trans. Biol. Soc. Liverpool, vol. vi. pp. 122-147. 



11. Huxley, T. H. — "On the nature of the Craniofacial apparatus of Petromyzon," Journ. Anal, and 

 Phys., vol. x., 187G, pp. 412-429. 



