CONTENTS 



Introduction page 267 



List of Species 268 



Systematic 269 



Family Megascolecidae. 



Microscolex falclandicus (Bedd.) 269 



Microscolex aquarumdulciuni (Bedd.) 273 



Microscolex georgianuSyi. georgianus {Mich.) 275 



Microscolex michaelseni, Bedd 278 



Chilota bicinctus (Bedd.) 280 



Chilota patagonicus (Kinb.) 282 



Yagansia gracilis (Bedd.) 282 



Yagansia papillosus {Bedd.) 284 



Dichogaster bolaui (Mich.) 286 



Family Lumbricidae. 



Eiseniella tetraedra, f. typica (Sav.) 288 



Eisenia rosea (Sav.) 288 



AUolobophora caliginosa (Sav.) 288 



Dendrobaena siibrubicunda (Eisen) 288 



Bimastus tenuis (Eisen) 288 



Lumbricus rubellus, HofFm., f. tristani, nov 289 



Lumbricidae Incertae Sedis 289 



