13 



1. Fam. Flosculariadae. 



2. Fam. Melicertadae, 



II. Ordo. Bdelloida. 



«That swim with their ciliary wreath, and creep like a leech; foot 

 wholly retractile within the body, telescopic, furcate ». 



3. Fam. Philodinadae. 



4. Fam. Adinetadae. 



III. Ordo. Ploima. 



«That swim with their ciliary wreath, and (in some cases) creep with 

 their toes». 



a) Subordo. Il-loricata. 

 «Foot when present, almost invariably furcate; but not transversely 

 wrinkled; rarely more than feebly telescopic, and partiallyr etractile^. 



5. Fam, Mi crocod i dae. 



6. Fam. Asplanchnadae. 



7. Fam. Synchaetadae. 



8. Fam. Triarthradae. 



9. Fam. Hydatinadae. 

 10. Fam. Notommatadae. 



b. Subordo. Loricata. 

 « Corona and ciliary wreath various in shape, but never Rhizotic, 

 and Bdelloidic only in the Pterodinadae : trophi of different types, 

 but never Bdelloidic, and Rhizotic only in the Pterodinadae». 



A. Divisio. 



«Foot jointed, stylare or furcate ; not transversely wrinkled, nor wholly 

 retractile ». 



11. Fam. Rattulidae. 



12. Fam. Dinocharidae. 



13. Fam. Salpinadae. 



14. Fam. Euchlanidae. 



15. Fam. Lepadelladae. 



16. Fam. Coluridae. 



B. Bivisio. 



«Foot transversely wrinkled, wholly retractile, furcate or ending in a 

 ciliated cup; sometimes absent», 



17. Fam. Pterodinadae. 



18. Fam. B rachi o nidae. 



IV. Ordo. Scirtopoda. 



«That swim with their ciliary wreath ; and skip with Arthropodous 



