CONTENTS, 



Introduction, 

 History, 



Bibliography, . 

 Anatomy, 



Description of the Species, 

 Ascidis Simplices, 

 Molgulidse, 

 Aseopi ra, 

 Molgula, 

 Eugyra, 



Cynthiidae, 



Bolteninae, 



Boltenia, 

 Guleolus, 



Comparison of the Species of Guleolus, 

 Fuwjulus, . 



Cynthinse, 

 Microcosmus, 

 Cynthia, 



Styeliiise, 

 Styela, 

 Bathyoncm, 



Polycarpa, 



Ascidiidse, 



Corynaseidia, 



Curella, 



Abyssascidia, 



Ascidia, 



Paehychlcena, 



Hypdbythvus, 



Cicma, 



Clavelinidae, 



Eett inascidia, 



Clavelina, . 



fAGE 



5 



5 

 11 

 25 



57 

 57 

 58 

 61 

 07 

 81 



83 



85 



86 



90 



120 



127 



130 

 130 

 134 



148 

 149 

 165 

 167 



182 

 186 

 189 

 193 

 196 

 221 

 227 

 233 



237 

 239 

 245 



