TABLE SHOWING THE CLASSIFICATION OP THE CHORDATA 

 DESCRIBED IN THIS. CHAPTER 



Phylum 



CHORDATA 



Class 



UROCHOBDA or TUNICATA 



Order LARVACEA 



(Free-swimming, pelagic ; Tunicata having caudal appendages) 



Suborders Genera 



Appendicularia 



Order THALIACEA 



( Free-svnmming Tunicata, without caudal appendages ; single or in colonies; muscles 

 of body-wall arranged in complete or in interrupted ring-like bands) 



CYCLOMYARIA 



( Cask-shaped bodies with complete rings I 



of muscular bands ; oral and atrial J 



apertures at opposite ends of the j 



body) 



HEMIMYARIA 

 ( Spindle-shaped bodies ; muscular bands } 



in incomplete rings ; oral and atrial 1 



apertures subterminal) 



PYROSOMATA / 



(Hollow cylindrical colonies ; zooids em- \ 



bedded in a gelatinous wall ; oral aper- < 



tures open on the outer, atrial apertures I 



open on the inner surface of cylinder) \_ 



472 



