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Show 26 ON THE SKELETON ETC. OF CERATODUS. [Jail. 1 tematik von Lepidosiren und Protopterus. Zool. Anzeiger, vol. ix. p. 521 (1886). 24. T H A C H E R , J. K.-Median and paired Fins, a contribution to the history of vertebrate limbs. Trans. Connectic. Acad. vol. iii. p. 281 (1877). 25. T H A C H E R , J. E. Ventral fins of Ganoids. Ibid. vol. iv. p. 233(1878). 26. TRAQUAIR, R. H.-On the Restoration of the Tail in Protopterus annectens. British Assoc. Reports, 1871, pt. 2, p. 143. 27. TRAQUAIR, R. H.-On the Structure and Affinities of Tris-tichopterus alatus. Trans. R. Soc. Edinb. vol. xxvii. p. 383 (1876). 28. W I E D E R S H E I M , R.-Ueber das Becken der Fische. Morph. Jahrb. vol. vii. p. 326 (1881). 29. WIEDERSHEIM, R.-Lebrbuch der vergleichd. Anat. der Wirbelthiere. Zweite Auflage. Jena, 1886. 30. W I E D E R S H E I M , R.-Das Skelet und Nervensystein von Lepidosiren (Protopterus). Jenaische Zeitschr. vol. xiv. p. 155(1880). IX. DESCRIPTION OF THE PLATES. PLATES I.-III. With the exception of fig. 2, all are drawn in the same relative position. The postaxial (internal) border looks towards the left hand. Fig. 1. A " branching " pelvic fin of Ceratodus. Right side, dorsal aspect. Nat. size. 2. The two pelvic fins of a second specimen. Ventral aspect. X 1£. 2a. The anterior portion of the pelvic girdle of the same. Nat. size. 3. The proximal third of the left fin of fig. 2. Ventral aspect. Nat. size. 4. Proximal third of a right pelvic fin ; indicated as seen from the ventral aspect, for sake of comparison with figs. 1 and 3. (After Gunther.) Nat. size. 5. The left pectoral fin of fig. 2. Ventral aspect. Nat. size. 6. Proximal portion of the corresponding fin of a fourth specimen. Ventral aspect. Nat. size. 7. Proximal portion of the left pelvic fin of the same specimen. Ventral aspect. Nat. size. 8. The proximal third of the left pectoral fin of a fifth specimen. Drawn to same scale as figs. 5 and 6. (After Giinther.) 8a. Basal portion of a left pectoral fin of Protopterus. x4. 9. The left pectoral fin of Cestracion philippi. Young §, dorsal aspect. Half nat. size. 10. The basal portion of a similar fin; same aspect. Adult. (After Huxley.) Reduced to the same scale as fig. 9 for sake of comparison. 11. The left pectoral fin of a young Polypterus. Ventral aspect. x 2. 12. The loft pelvic fin of a young Chimcera (C. monstrosa), <S• Ventral aspect. X i i In figs. 5 and 7 the parameres not represented in full were all rod-like and unbranched. The dotted lines in figs. 9 and 12 represent lines of fusion observed; those in figs. 5, 6, and 10 are inferred. Reference Letters, cp. Base of clasper. ,/'. Inter-articular ligament, m.p. Proximal mesomere. •ms. Mesopterygium. mt. Metapterygium. pl. Pelvic girdle, pr. Preaxial iin-border. ps. Postaxial fin-border, pt. Propterygium. r. Metapterygial rays. |