TABLE SHOWING THE CLASSIFICATION OF THE CHORDATA 
DESCRIBED IN THIS CHAPTER 
Phylum 
CHORDATA 
Class 
UROCHORDA or TUNICATA 
Order LARVACEA 
(Free-swimming, pelagic; Tunicata having caudal appendages) 
Suborders Genera 
Appendicularia 
Order THALIACEA 
(Free-swimming Tunicata, without caudal appendages ; single or in colonies ; muscles 
of body-wall arranged in complete or wn interrupted ring-like bands) 
CYCLOMYARIA 
(Cask-shaped bodies with complete rings | 
of muscular bands ; oral and atrial Doliolum 
apertures «at opposite ends of the 
body) | 
HEMIMYARIA 
( Spindle-shaped bodies ; muscular bands ) 
in incomplete rings; oral and atrial ) Salpa 
apertures subterminal) ( 
PYROSOMATA 
(Hollow cylindrical colonies ; zodids em- 
bedded ina gelatinous wall ; oral aper- Pyrosoma 
tures open on the outer, atrial apertures 
open on the inner surface of cylinder) 
472 
