758 ON SELACHIAN FISHES. {June 19, 



The following deal with the vertebral column : — 



20. Hasse, Das natlirliche System cler Elasmobrachier (1879- 



1885). 



21. Mayer, Mittheil. Zool. Stat. Neapel, vi. 1885, p. 217. 



22. Gaclow and E. 0. Abbott, Phil. Trans. Roy. Soc. clxxxvi. 



1895, p. 163. 



23. Ridewood, Journ. Linn. Soc. (Zool.) xxvii. 1899, p. 46. 



Gadow gives a bibliography which may be consulted for 

 further references. 



The literature of the paired fins up to 1892 is summarised by 

 Wiedersheim (31), and from then to 1901 by Boulenger (33). 

 The following may be mentioned here : — 



24. Thacher, Trans. Connect. Ac. iii. 1877, p. 281. 



25. Thacher, op. cit. iv. 1877, p. 233. 



26. Balfour, A Monograph of the Development of Elasmo- 



branch Fishes (1877). 



27. Mivart, Trans. Zool. Soc. x. 1879, p. 458. 



28. Balfour, A Treatise on Comparative Embryology (1880-81). 



29. Dohrn, Mittheil. Zool. Stat. Neapel, v. 1884, p. 161. 



. 30. Mayer, Mittheil. Zool. Stat. Neapel, vi. 1885, p. 217. . 



31. Wiedersheim, Das Gliedmassenskelet der "Wirbelthiere 



(1892). 



32. Kerr, Proc. Cambridge Phil. Soc. x. 1900, p. 227. 



33. Boulenger, Les Poissons du Bassin du Congo (1901). 



Important memoirs dealing with the mixopterygia are : — 



34. Jungersen, The Danish Ingolf Expedition, II. 2 (1899). 



35. Huber, Zeitschr. f. wiss. Zool. Leipzig, Ixx. 1901, p. 592. - 



Smith Woodward's Catalogue (7) and the bibliography at the 

 end of his Text-book (10), as well as the references in Zittel's 

 book (43), should be consulted for the literature on fossil Sharks. 

 In addition to Jaekel's works already quoted (8 & 11) I may 

 cite : — 



36. Traquair, Geol. Mag. 1888, p. 82. {Cladodus.) 



37. Fritsch, Faun. Gaskohle Permform. Bbhm. ii. p. 99 



(1889), & iii. p. 3 (1890). 



38. Jaekel, Sitzungsb. Ges. naturf. Fr. Berlin, 1890, p. 119. 



(Finspines.) 



39. Dean, Journ. Morphol. ix. 1894, p. 102. [Cladoselachus.) 



40. Cope, Journ. Ac. Philad. ix. 1895, p. 427. {Symmor'mm.) 



41. Campbell Browai, Palseontogr. xlvi. 1900, p. 149. {Hyhodus.) 



42. Hay, Trans. Am. Phil. Soc. (2) xx. 1902, p. 63. (Chrono- 



logical distribution.) 



43. Zittel, Text-book of Palaeontology (Eastman's translation), 



II. (1902). 



P. Z. S. 1906, pp. 179-462, were pxiblished on August 23i-d, 1906. 



