The works of Francis Maitland Balfour, Volume 3 (of 4)
CHAPTER IX. REPTILIA. Pp. 202-213.
_Lacertilia_, pp. 202-209. Segmentation and formation of the layers, pp. 202-207. General development of the embryo, p. 208. Embryonic membranes and yolk-sack, pp. 208-210. _Ophidia_, p. 210. _Chelonia_, pp. 210-212.