xii ILLUSTRATIONS 



FIG. PAGE 



116. RANA. EXTERNAL VIEWS OF EMBRYOS . . . 228 



117. RANA. DIAGRAMMATIC LONGITUDINAL SECTION OF 



EMBRYO ,228 



118. KANA. DIAGRAMMATIC LONGITUDINAL SECTION OF 



TADPOLE AT HATCHING . . . . . 230 



119. KANA. DIAGRAMMATIC VIEWS OF ARTERIAL CIRCULA- 



TION OF TADPOLE AND FROG . . . . 232 



120. SEGMENTATION OF BIRD'S EGG 235 



121. DEVELOPMENTAL STAGES OF FOWL .... 237 



122. TRANSVERSE SECTIONS OF EMBRYO OF A LESSER 



BLACK-BACKED GULL . . . . . . 239 



123. TRANSVERSE SECTIONS OF SECOND-DAY FOWL . .' 241 



124. DIAGRAMMATIC LONGITUDINAL SECTIONS OF SECOND- 



AND THIRD-DAY FOWLS " . . . . . 242 



125. TRANSVERSE SECTION OF BODY OF THIRD-DAY FOWL . 243 



126. SEGMENTATION OF THE MAMMALIAN EGG . . . 247 



127. DIAGRAMS TO ILLUSTRATE THE FORMATION OF THE 



AMNION OF MAMMALS . . . . . 248 



128. DEVELOPMENTAL STAGES OF RABBIT .... 249 



129. DIAGRAMMATIC LONGITUDINAL SECTION OF MAMMALIAN 



EMBRYO 253 



130. SKULL OF DOG. EXTERNAL VIEW .... 262 



131. SKULL OF DOG. INTERNAL VIEW OF LONGITUDINAL 



SECTION 263 



132. TRANSVERSE SECTION OF NASAL REGION OF SKULL 



OF SHEEP 265 



133. DEVELOPMENT OF A TOOTH . . . . 272 



134. LEPUS. GENERAL DISSECTION . . . . 276 



135. LEPUS. TRANSVERSE SECTIONS THROUGH THORAX 



AND ABDOMEN . . . . , . ,\ 281 



136. LEPUS. DIAGRAM OF BLOOD CIRCULATION OF EMBRYO 284 



137. LEPUS. DIAGRAM OF THE BLOOD CIRCULATION . . 288 



138. LONGITUDINAL SECTION OF THE BRAIN OF THE SHEEP 293 



139. LEPUS. A DIAGRAM OF THE NERVES OF THE NECK 



AND THORAX .298 



140. GENERAL DIAGRAM OF THE MAMMALIAN AUDITORY 



ORGAN *- , -v 301 



141. SECTION OF ORGAN OF CORTI . * , . .; ;- 302 



142. LEPUS. TRANSVERSE SECTIONS TO ILLUSTRATE THE 



DEVELOPMENT OF THE PRONEPHROS . . . 305 



143. LEPUS. DEVELOPMENT OF MESONEPHRIC TUBULE . 306 



144. LEPUS. THE EMBRYONIC CONDITION OF THE DUCTS 



AT THE POSTERIOR END OF THE BODY, . . . 307 



145. LEPUS. REPRODUCTIVE ORGANS 308 



