Zvi CONTENTS. 



PAGE 



SUMMARY . , 489 



B. The Development of the Organ of Hearing .... 490 



(a) The Development of the Otocyst into the Labyrinth . 491 



(b) u Membranous Ear-Capsule into 



the Bony Labyrinth and the 

 Perilymphatic Spaces . 498 



(c) Middle and External Ear . . 505 

 SUMMARY 510 



C. The Development of the Organ of Smell . . . . .511 

 SUMMARY 518 



IIL THE DEVELOPMENT OP THE SKIN AND ITS ACCESSORY ORGANS 520 



(a) The Skin 520 



(&) , Hair 522 



(c) Nails 526 



(d) Glands of the Skin 528 



SUMMARY . .... . . 531 



CHAPTER XVII. 

 THE ORGANS OF THE INTERMEDIATE LAYER OR MESENCHYME 538 



I. THE DEVELOPMENT OP THE BLOOD-VESSEL SYSTEM . . . 542 



A. The first Developmental Conditions of the Vascular System . 542 



(a) Of the Heart ... 542 



( J) Vitelline Circulation, Allantoic and Placental Circulation 549 

 2?. The further Development of the Vascular System up to the 



Mature Condition 553 



(a) The Metamorphosis of the Tubular Heart into a Heart 



with Chambers 553 



(J) The Development of the Pericardial Sac and the Dia- 

 phragm 566 



(c) Metamorphoses of the Arterial System .... 570 



(d) Venous .... 577 

 SUMMARY 588 



II. THE DEVELOPMENT OP THE SKELETON 593 



A. The Development of the Axial Skeleton . 693 



(a) The Development of the Vertebral Column . . . 596 



(b) Head-Skeleton . 



I. Bones of the Cranial Capsule 619 



II. Visceral Skeleton 622 



(o) Concerning the Relation of the Head-Skeleton to the 



Trunk-Skeleton 627 



B. The Development of the Skeleton of the Extremities . . 635 



(a) Pectoral and Pelvic Girdles 638 



(&) Skeleton of the Free Extremity 640 



(c) Development of the Joints 644 



SUMMARY 647 



APPENDIX TO LITERATURE . . 658 



