PEDIGREE OF WORMS, I5!I 
Chzetopoda 
rine a 
Phracthelminthes 
Echiurida Hirudinea 
Sipunculida Onychophora 
a Arctisca 
Gephyrea 
———" 
Cheetognatha ————— | 
—— 
Nematoda | 
Annelida 
Acantho- 
cephala |Stelmopoda 
Enteropnenusta 
——__—[Lophopoda Ascidia 
Nemathelminthes| Bryozoa Thalicea Nemertina 
Rotifera —_— 
Rhynchocela 
| | Tunicata 
oS ee 
Coelomati (worms with body-cavity) 
Cestoda 
Trematoda 
Turbellaria 
Platyhelminthes 
Acclomi (worms without body-cavity) 
Archelminthes 
Prothelmis 
Gastrea 
