TABLE OF CONTENTS 



XV 



CHAPTER XVIII 



Phylum Echinodermata P^g^ 623 



[Subphylum Eleutherozoa] 



Class Asteroidea 634 



Class Ophiuroidea 638 



Class Echinoidea 640 



Order Endocyclica 647 



Order Clypeastroida 647 



Order Spatangoida 647 



Class Holothuroidea 648 



Order Aspidochirotae 652 



Order Pelagothurida 652 



Order Elasipoda 652 



Order Dendrochirotae 652 



Order Molpadida 652 



Order Synaptida (Paractinopoda) 652 



[Subphylum Pelmatozoa] 



Class Crinoidea 654 



Class Amphoridea 658 



Class Carpoidea 658 



Class Thecoidea (Edrioasteroidea) 658 



Class Cystoidea 658 

 [Order Diploporida] 

 [Order Rhombifera] 



Class Blastoidea 659 



CHAPTER XIX 



Phylum Chordata 660 

 Subphylum Hemichorda (Enteropneusta s.lat.) 662 

 [Class Enteropneusta (Balanoglossida)] 

 [Class Pterobranchia] 



Subphylum Tunicata (Urochorda) 669 



Class Larvacea 679 



Class Ascidiacea 680 



Class Thaliacea 681 



Order Pyrosomatida (Luciae) 685 



Order Salpida (Herhimyaria) 685 



Order Doliolida (Cyclomyaria) 686 

 [Subphylum Cephalochorda] 

 [Subphylum Vertebrata] 



