LIST OF ILLUSTRATIONS xxi 



F10. PAGE 



86. MEDIAN LONGITUDINAL SECTION THROUGH THE HEAD OF A 



NEWLY-HATCHED LARVA OP THE LAMPREY (Petremyzon plaiierf) 136 



87. LATERAL VIEW OP THE NASAL CHAMBER OF A HUMAN EMBRYO . 141 



88. SAGITTAL SECTION THROUGH THE NASAL AND BUCCAL CAVITIES 



OF THE HUMAN HEAD . 142 



89. A-D, STAGES IN THE DEVELOPMENT OP THE SO-CALLED JACOBSON'S 



ORGAN OF THE URODELA. E, THE SAME ORGAN IN A GYMNO- 

 PHIONE. F-H, THE NOSE AND JACOBSON'S ORGAN IN 

 Lacerta, A PLACENTAL MAMMAL, AND Ornithorhynchus. H, 

 after Symington . ....... 144-145 



90. HEADS OF TWO HUMAN EMBRYOS AT SECOND AND THIRD MONTHS 147 



91. HUMAN EYE 148 



92. DIAGRAM TO ILLUSTRATE THE SHIFTING OF THE LACHRYMAL 



GLAND, WHICH HAS TAKEN PLACE IN THE COURSE OF 

 PHYLOGENY 149 



93. EYE OF A MONGOLIAN, WITH THE EPICANTHUS . . . .150 



94. DIAGRAM TO ILLUSTRATE THE METAMORPHOSIS DURING DEVELOP- 



MENT OF THE VISCERAL SKELETAL ARCHES . . . .151 



95. PALATE OF A HUMAN EMBRYO AT THE EIGHTH MONTH . .155 



96. PALATAL FOLDS OP THE RACOON (Procyon lotor) . . . .156 

 .97. HUMAN MOUTH, IN WHICH THE DEVELOPMENT OF THE UPPER 



OUTER INCISORS HAS BEEN SUPPRESSED . . . .158 



98. HUMAN STOMACH 166 



99. THE C^CUM AND PROCESSOS VERMIFORMIS IN A HUMAN 



EMBRYO 167 



100. THE CAECUM AND VERMIFORM PROCESS OF A HUMAN EMBRYO . 168 



101. THE CAECUM AND VERMIFORM PROCESS IN A KANGAROO . .169 



102. HUMAN LARYNX IN FRONTAL SECTION 174 



103. A SERIES OF WHOLLY DIAGRAMMATIC FIGURES TO ILLUSTRATE 



THE COMPARATIVE MORPHOLOGY OF THE URINOGENITAL 

 ORGANS OF THE VERTEBRATA 191 



104. DIAGRAMMATIC REPRESENTATIONS op THE CHIEF TYPES OF 



UTERUS OCCURRING IN THE PLACENTAL MAMMALS . . .193 



105. A, PARTLY DIAGRAMMATIC REPRESENTATION OF THE EMBRYONIC 



URINOGENITAL APPARATUS OF A MALE MAMMAL, showing its 

 relations to the Ventral abdominal wall. B, THE PENIS AND 

 SCROTUM OP A HUMAN EMBRYO, 15 cm. long. Both figures 

 founded on the work of Klaatsch . 197 



