Contents 



Page 



Introduction 1 



Ascidiacea 22 



Order Aplousobranchia 22 



Family Synoicidae 22 



Family Didemnidae 62 



Family Polycitoridae 101 



Order Phlebobranchia 133 



Family Diazonidae 133 



Family Cionidae 133 



Family Perophoridae 136 



Family Ascidiidae 138 



Family Rhodosomatidar' 148 



Order Stolidobranchia 151 



Family Botryllidae 151 



Family Styelidae 162 



Family Pyuridae 197 



Family Molgulidae 222 



Appendicularia 228 



Family Oikopleuridae 228 



Thaliacea 228 



Family Doliolidae 228 



Family Salpidae 229 



Pyrosomata 230 



Family Pyrosomidae 230 



Literature cited 232 



Index 239 



