CHORDATA 



473 



Suborders 



Genera 

 Order ASCIDIACEA 



Species 



(Mostly fixed Tunicata ; single or in colonies ; tests of considerable thickness) 



JM. marihattensis 

 M. peUucida 

 M. arenata 

 I C. pyriformte 



ASCIDIA SIMPLICES 

 (Possess distinct tests; usually perma- 

 nently fixed) 



ASCIDIA COMPOSITE 

 (Fixed colonies ; the zooids embedded in a 

 common gelatinous material ; without 

 separate tests) 



Cynthia 



Boltenia 

 Ascidia 



Botryllus 

 Amarcecium 



C. partita 



C. carnea 



B. clavata 

 j A. amphora 

 ! A. callosa 



B. gouldii 

 A. pellucidum 



