FLAGELLATA. 31 



Fam. 6. Coelomonadina. Euglenoids coloured with numerous chlorophyll 

 bodies, or one to two larger plate-like chromatophores ; usually no true pharynx. 

 Ccelomonas Stein, ectoplasm with chlorophyll grains ; Gonyostomum Diesing, like 

 preceding, with trichocysts in ectoplasm ; Microglena Ehrb. ; Chromulina 

 Cienk.; Cryptoglena Ehrb. ^ 



Fam. 7. Euglenina. Elongated ; hind end usually pointed ; spirally striped 

 cuticle ; reservoir with usually several contractile vacuoles and simple stigma 

 close behind pharynx ; chromatophores, usually green, almost always present. 

 Euglena Ehrb. (Fig. 25) ; Colacium Ehrb. ; Eutreptia, Perty ; Ascoglena Stein ; 

 Trachelomonas Ehrb. 



Fam. 8. Chloropeltina. Like preceding, but with thicker cuticle. Lepo- 

 cinclis Perty ; Phacus Nitzsch. 



Fam. 9. Menoidina. Like Euglenina, but without chlorophyll and stigma ; 

 saprophytic. Astasiopsis Biitschli ; Menoidium Perty ; Rhabdomonas Fresenius. 



Fam. 10. Peranemina. 



Fam. 11. Petalomonadina. 



Fam. 12. Astasiina, with small or large second flagellum. Astasia Ehrb.; 

 Hetcronema Duj. ; Sphenomonas Stein. 



Sub-order 3. HETEKOMASTIGODA. 



With two flagella of different character and size, the one directed forward and 

 the other (sometimes two) trailed behind ; with at least a mouth-spot, which 

 in the larger forms becomes a mouth with pharynx ; colourless, holozoic ; some- 

 times amoeboid. 



Fam. 13. Bodonina. Bodo Ehrb. (ffeteromita), the hooked monad and the 

 springing monad. Phyllomitus Stein ; Colponema Stein ; Dallingeria Kent. 



Fam. 14. Anisonemina. 



Sub-order 4. ISOMASTIGODA. 



With two, four, rarely five equal flagella at the anterior end ; rarely with 

 mouth opening and pharynx. 



Fam. 15. Amphimonadina. 



Fam. 16. Spongomonadina. Biflagellate ; colonial, the individuals living in 

 a granular jelly, or at the end of branched gelatinous tubes. Spongomonas 

 Stein ; Cladomonas Stein ; Rhipidodendron Stein ; Diplomita Kent. 



Fam. 20. Tetramitina. Naked and sometimes amoeboid Isomastigoda, with 

 finely pointed hind end ; anterior end with four equal flagella, one of which 

 may be larger and directed backwards ; the latter may have the form of an 

 undulating membrane ; distinct mouth only rarely discernible ; holozoic. 

 Collodictyon Carter ; Tetramitus Perty ; Monocercomonas Grassi ; Trichomonas 

 Donne (Figs. 21 b and 22) ; Trichomastix Blochmann. 



Fam. 21. Polymastigina. Somewhat oval, with broader or pointed hind 

 end, which is continued into two flagella. At the anterior end of the body 

 are two or three flagella on each side. Holozoic, and perhaps in part sapro- 

 phytic. Hexamitus Duj. ; Megastoma Grassi. 



Fam. 22. Trepomonadina. The two anterior flagella arise far apart from 

 one another at the sides of the body. Trepomonas Duj. 



Fam. 23. Cryptomonadina. Coloured or colourless ; usually laterally com- 

 pressed, without true cuticle, with two long anterior flagella ; anterior end 

 obliquely truncated, and pitted inwards slightly on one side ; the pit may lead 

 into a pharynx. Cyathomonas Fromentel, possibly having affinities with the 

 Dinoflagellata ; Chilomona&JSblb,; Cryptomonas Ehrb. ; Oxyrrhis Duj. 



