------------------+-------------------------+----------------------+------------------ _Classes_ | | _Systematic_ | _of the_ | _Orders of the_ | _Name of the_ | _Name of a Genus_ _Worm Tribe._ | _Worm Tribe._ | _Orders of Worms_. | _as example._ | | | ------------------+-------------------------+----------------------+------------------ 1. _Flat_ { 1. Primæval worms | 1. Archelminthes | Prothelmis _Worms_ { 2. Gliding-worms | 2. Turbellaria | Planaria Platyhel- { 3. Sucker-worms | 3. Trematoda | Distoma minthes { 4. Tape-worms | 4. Cestoda | Tænia | | 2. _Round_ { 5. Arrow-worms | 5. Chætognatha | Sagitta _Worms_ { 6. Thread-worms | 6. Nematoda | Trichina Nemathel- { 7. Hook-headed | 7. Acanthocephala | Echinorhynchus minthes { worms | | | | 3. _Moss_ } 8. Horse-shoe-lipped | 8. Lophopoda | Alcyonella _Polyps_ } 9. Circle-lipped | 9. Stelmopoda | Retepora Bryozoa } | | | | 4. _Sea-sacs_ { 10. Sea-squirts | 10. Ascidia | Phallusia Tunicata { 11. Sea-barrels | 11. Thaliacea | Salpa | | 5. _Proboscideans_ } 12. Tongue-worms | 12. Enteropneusta | Balanoglossus Rhynchocœla } 13. Cord-worms | 13. Nemertina | Borlasia | | { 14. Star-worms without | 14. Sipunculida | Sipunculus 6. _Star-Worms_ { bristles | | Gephyrea { 15. Star-worms with | 15. Echiurida | Echiurus { bristles | | | | 7. _Wheel_ } | | _Animalcule_ } 16. Wheel-worms | 16. Rotatoria | Hydatina Rotifera } | | | | { 17. Bear-worms | 17. Arctisca | Macrobiotus { 18. Worms with claws | 18. Onychophora | Peripatus 8. _Ring_ { 19. Leeches | 19. Hirudinea | Hirudo _Worms_ { 20.