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Show 1889] EOCENE SILUROID FISHES. 207 Fauna of the Tertiary Deposits of the Highlands of Padung, Sumatra." Geol. Mag. dec. 2, vol. iii. p. 433 (1876). 4. H E C K E L , J. J.-Beitrage zur Kenntniss der fossilen Fische Oesterreichs." Sitzungsb. k. Akad. Wiss. Wien, 1849, p. 19, and Denkschr. vol. i. p. 213 (1850). 5. KOENIG, C.-Icones Fossilium Sectiles, pi. viii. fig. 91 (1825). 6. K O K E N , E . - " Ueber Fisch-Otolithen &c." Zeitschr. deutsch. geol. Gesell. vol. xxxvi. p. 559, pi. xii. fig. 13 (1884). 7. L E HON.-Preliminaires d'un Memoire sur les Poissons Tertiaires 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. L Y D E K K E R , R.-Siwalic Crocodilia &c. and Tertiary Fishes. Palseont. Indica, ser. x. vol. iii. p. 246 (1886). 10. M A R C K , W . V O N D E R . - " Neue Fische und Krebse aus der Kreide von Westphalien." Palaeontogr. vol. xv. p. 276 (1868) ; and vol. xxxi. p. 248 (1885). 11. SAUVAGE, H. E., in C. Deperet's "Description Geologique du Bassin Tertiaire du Roussillon." Ann. d. Sci. Geol. vol. xvii. p. 223(1885). 12. W O O D W A R D , A. S M I T H . - " On some remains of Siluroid Fishes from British Eocene Formations." Geol. Mag. dec. 3, vol. iv. . p. 303 (1887). 13. W O O D W A R D , A. S M I T H . - " O n Bucklandium diluvii, Koenig; a Siluroid fish from the London Clay of Sheppey." Brit. Assoc. Rep. 1888, and Ann. & Mag. Nat. Hist. ser. 6, vol. ii. p. 355 (1888). 14. ZITTEL, K A R L A.-Handbuch der Palaeontologie, vol. iii. p. 360 (1888). EXPLANATION OF PLATE XXI. All the figures are natural size except numbers 8 and 9, which are reduced one third. Fig. 1. Arius crassus, Koken. Skull from the Upper Eocene of Barton, hi the 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. Arius species A. Otolith (left ?) from Upper Eocene of Barton, in the British Museum. 5. Arius species B. Otolith (right ?); ditto, ditto. 6. Arius species C. Otolith (right?); ditto, ditto. 7. Arius baroni, 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 temporal; pt.ot., pterotic; sp.ot., sphenotic; fr., frontal; pr.fr., prefrontal; eth., ethmoid ; tr.pr., transverse process of vertebra ; hut., articulation for hyomandibular. |