[10] The proximal end of anything is the one nearest the point of origin or attachment, the distal end is the one furthest from the point of origin or attachment.
[11] W.K. Parker, A Monograph of the Shoulder Girdle and Sternum, Ray Soc. London, 1868.
[12] See R. Wiedersheim, Zeitschr. wiss. Zool. vol. LIII. suppl. p. 43, 1892.
[13] G. Baur, Beiträge zur Morphogenie des Carpus und Tarsus der Vertebraten, Theil 1. Batrachia. Jena, 1888, and Amer. Natural., vol. XIX. 1885 (several papers).
[14] This account is based on Chapter XX. of Flower's Osteology of the Mammalia. London 1876.
[15] A. Smith Woodward, Catalogue of Fossil Fishes in the British Museum, Part II., Introduction, p. xii.
[16] This classification of reptiles is mainly based on that of Lydekker (Catalogue of Fossil Reptiles in the British Museum) but in some respects that of von Zittel has been followed.
[17] This classification of birds is essentially that of Gadow and Selenka in Bronn's Classen und Ordnungen des Thierreichs, Band vi., Abth. iv., Vögel. Leipzig, 1891.
[18] The classification adopted is almost entirely that given in Flower and Lydekker's Mammals Living and Extinct. London, 1891.
[19] The name Balanoglossus is used here in its widest sense to include all the Enteropneusta.