1889.] EOCENE SILUROID FISHES. 207 



Fauna of the Tertiary Deposits of the Highlands of Padung, 

 Sumatra." Geol. ilag. dec. 2, vol. iii. p. 433 (1876). 



4. Heckel, J. J. — Beitriige zur Kenntniss der fossilen Fische 



Oesterreichs." Sitznngsb. k. Akad. Wiss. Wien, 1849, p. 19, 

 and Denkschr. vol. i. p. 213 (1850). 



5. KoENiG, C. — leones Fossilium Sectiles, pi. viii. fig. 91 (1825). 



6. KoKEN, E. — " Ueber Fisch-OtoHthen &c." Zeitschr. deutsch. 

 geol. Gesell. vol. xxxvi. p. 559, pi. xii. fig. 13 (1884). 



7. Le Hon. — Preliminaires d'un Memoire sur les Poissons Ter- 

 tiaires de Belgique, p. 15 (1871). [Notes occurrence only.] 



8. Leidy, J. — Contributions to the extinct Vertebrate Fauna of 

 the Western Territories. Rep. U.S. Geol. Surv. 1873, p. 193. 



9. Lydekker, R. — Siwalic Crocodilia &c. and Tertiary Fishes. 



PalaJont. Indica, ser. x. vol, iii. p. 240 (1886). 



10. Marck, W. VON DER. — " Neuc Fische und Krebse aus der 



Kreide von Westphalien." Palaeontogr. vol. xv. p. 27(5 (1868) ; 

 and vol. xxxi. p. 248 (1885). 



11. Sauvage, H. E., in C. Depe'ret's "Description Ge'ologique du 



Bassin Tertiaire du Roussillon." Ann. d. Sci. Geol. vol. xvii. 

 p. 223(1885). 



12. "Woodward, A. Smith. — " On some remains of Siluroid Fishes 



from British Eocene Formations." Geol. Mag, dec. 3, vol. iv. 

 p. 303 (1887). 



13. Woodward, A. Smith. — " On Buc/clandiurn diluvii, Koenig; a 



Siluroid fish from the London Clay of Sheppey." Brit. Assoc. 

 Rep. 1888, and Ann. & Mag, Nat. Hist, ser. G, vol. ii. p. 355 

 (1888). 



14. ZiTTEL, Karl A. — Handbuch der Palaeontologie, vol. iii, p. 360 

 (1888). 



EXPLANATION OF PLATE XXI. 



All tlie figures are natural size except numbers 8 and 9, which 

 are reduced one third. 



Fig. 1. Arins crassus, Kokeu. SkuU from tlie Upper Eocene of Barton, m 

 tlie Museum of Practical Geology, upper surface. 



2. Same specimen, under surface. 



3. Otolith from right side of same specimen : a, upper surface ; b, lower 



surface ; c, side view. 



4. Arms species A. Otolith (left ?) from Upper Eocene of Barton, in 



the British Museum. 



5. Anus species B. Otolith (right ?) ; ditto, ditto. 



6. ^rwes species C. Otolith (right ?); ditto, ditto. 



7. Arms haroni, n. sp. Otolith (right ?) from Ankoala, Madagascar, in 



the Baron Collection, British Museum. 



8. Arius gagorides, Cuv. & Val. (living species, from Calcutta). Upper 



surface of left half of a skull 8§ inches long, two thirds natural size. 

 In the British Museum. 



9. Same specimen, lower surface. 



10. Otolith (right ?) from same specimen, natural size ; letters as in 

 figure 3. 



S.O., supraoccipital ; ep.ot., epiotic (?) ; pa., parietal (?) ; pt.tem., post tem- 

 poral ; ft.ot., pterotic; »p.ot., sphenotic ; jr., froutal ; 'pr.J'r., prefrontal; 

 efh., ethtiioid ; fr.pr., transverse process of vertebra ; hin., articulation for 

 byoniandibular. 



