APPENDIX. 



A LIST is subjoined of the most useful works that treat upon the 

 Development of the Vertebrata, this being a subject of the highest 

 interest and importance when a general comparison is instituted 

 between the several classes. 



Baer, Rathke, and others, in Burdach's Physiol. 2d ed. 1837, have 

 given a most complete and general survey of the development of the Ver- 

 tebrata. Upon that of the Mammalia, consult Von Baer's Entwickelungs- 

 geschichte der Thiere, Koningsb. 1837. Bischoft', Entwickelungsgeschichte 

 des Kanincheneies, Braunschweig, 1842, and Rudolph Wagner's Elements 

 of Physiology by Dr. Willis, part 1, on Generation, where copious biblio- 

 graphical references are also given. Birds, Von Baer, liber Entwickelungs- 

 geschichte der Thiere, 1 ter Theil, 1828. Pander, Beitriige zur Entwick- 

 elungsg. des Hiinchens im Ei., Wurzburg, 1817. Reichert Entwickel- 

 ungsleben im Wirbelthierreich, Berlin, 1840. Reptiles, Baer, op. cit. 

 Band 2, on Batrachia. Rathke, Entwickelung der Natter, Koningsb. 

 3839. Reichert, op. cit. Vogt. Untersuch. iiber Entwickelungsg. der 

 Geburtshelferkrote, Solothurn, 1842. Fishes, Baer, Untersuch, iiber Ent- 

 wickelungsg. der Fische, Koningsb. 1835, and Vogt. Entwickelungsg. der 

 Forelle in Agassiz Hist. Nat. des Poissons d'eau douce de 1'Europe, Neuf- 

 chatel, 1841. 



The following Addenda comprise some new and valuable contribu- 

 tions to the literature and anatomy of the Vertebrata : 



Otto Kb'stlin, der Bau des Knochernen Kopfes in den vier Klassen der 

 Wirbelthiere, mit 4 Tafeln, Stuttg. 1844. 



Reichert, Vergleichende Entwickelungsg. des Kopfes der nackten Am- 

 phibien, Koningsb. 1838. 



Rapp, Anat. Untersuch. iiber die Edentaten, Tubingen, 1843. 



Natalis Guillot., l^Organiz. du Centre Nerveux d'Anim. Vertebres in 

 Mem. de 1'Acad. de Bruxelles, torn. 13. 1843. 



NOTE to pages 49 and 61. 



The thymus gland, according to Owen, trans. Zool. Soc., vol. 1, is ab- 

 sent even in the foetus of the Marsupialia, but not in the Ornithorynchus. 

 The Cloaca appears only to occur in the female Marsupials. 



NOTE to page 100. 



Dr. Rudolph Wagner found that the bulk of the creamy fluid contained 

 in, and even the recticular membrane lining, the Ingluvial gland of an old 

 pigeon that had died two days after hatching her young, consisted of soft 

 whitish granules, about J-lh to jj^th of a line in size, presenting in their 

 interior small highly refractive nuclei ; they consisted of protein combined 

 with fat, but contained neither milk-sugar nor fluid casein, although the 

 secretion of this gland has been constantly compared to the milk of a 

 Maramiferous animal. 



