LIST OF FIGURES xix 



PAGE 



Diversity of Chromosomes in a nucleus 529 



Male of Argonauta. After Jatta 535 



Group of Slipper Limpets. After Orton 538 



Two larval stages of Sacculina. After Delage 539 



A Crab parasitised by Sacculina. After Geoffrey Smith 540 



Dimorphism of Beak in Huia Bird 542 

 Holothurian carrying young ones. After Challenger Report 550 



Bunch of Sepia Eggs. After Jatta 552 



Egg-clusters of Squid 552 



A Starfish carrying a cluster of Young Ones 556 



Head of Hornbill 562 



Male Kurtus carrying eggs. After Weber 563 



Brain of a Dog 599 

 Diagrams of Reflex Action. Modified, with permission, from 



Bayliss 630 



Schema of different modes of Animal Behaviour 637 



Peculiar Type of Alcyonarian, Studeriotes 673 



Homologies of Different Types of Wing 675 



Part of Goethe's figure of the Flower 677 



Deep-sea Cuttlefish with "telescope-eyes". After Chun 681 



Development of Mammal's Brain 683 



Foetal Membranes of a Mammal. After Turner 685 



Hyoid Apparatus of a Turtle 685 



A typical Ascidian or Tunicate 688 



Rattle of Rattlesnake 689 



Excretory Cells in various types 690 



Nerve-ending of a Sensory Neuron 694 



Haploid and Diploid Chromosomes 702 



Two Living Chromosomes 703 



Stereoscopic view of a Dividing Cell , 704 



