SCHEME OF THE CLASSIFICATION ADOPTED 

 IN THIS BOOK 



The names of extinct groups are printed in italics. 

 CHORDATA (p. 3). 



Order. 

 ENTERO- 

 PNEUSTA 



(p. 5) 



PTERO- 

 BRANCHIA 



(p. 21) 



PHORONIDEA 



(P- 27) 



Order. 



I. HEMICHORDATA (p. 3). 

 Family. 



( Glandicipitidae(p. 17). 

 { Ptychoderidae (p. 17). 

 ^ Harrimaniidae (p. 17 ). 



II. UROCHORDATA = TUNICATA (pp. 4, 35, 63). 



Sub-Ordfir. 



Family. 



Append iculariidae 

 " Clavelinidae (p. 71). 



Ascidiidae (p. 72). 

 Cynthiidae (p. 74). 



i. 68). 



Sub-Family. 



Molgulidao (p. 77). 



Distomatidae (p. 85). 



Coelocormidae (p. 86). 



Didemnidae (p. 86). 



Diplosomatidae (p. 87). 



Polyclinidae (p. 87). 

 f Botryllidae (p. 88). 

 \ Polystyelidae (p. 89). 



Pyrosomatidae (p. 91). 



Doliolidae (p. 96). 



/ Salpidae (p. 101). 

 Octacnemidae (p. 108). 



Hypobythiinae 



(p. 72), 



Ascidiinae (p. 72). 

 Corellinae (p. 73). 

 Styelinae (p. 74). 

 Cynthiinae (p. 75). 

 Bolteninae (p. 75). 



