EXPLANATION OF PLATE XXII. 

 FIG. 



i, 2. CHLOROMONAS PIGRA, Ehr. sp., vol. i. p. 401. Vertical and profile aspects, 

 X 1500 (Stein). 



3-7. CHRYSOMONAS OCHRACEA, Ehr. sp., vol. i. p. 402 (Stein). 3 and 4, Normal 

 free-swimming animalcules, x 600; 5-7, resting or encysted conditions, 

 accompanied by multiplication by segmentation into two, four, or eight 

 spore-like daughter-cells. 



8,9. CHRYSOMONAS FLAVICANS, Ehr. sp., vol. i. p. 402 (Stein). 8, Normal free- 

 swimming animalcule, x 600 ; 9, resting or encysted reproductive phase. 



10. MICROGLENA PUNCTIFERA, Ehr., vol. i. p. 403, x 6oo (Stein). 

 11-13. NEPHROSELMIS OLIVACEA, St., vol. i. p. 405, x 600 (Stein). 

 14-15. HYMENOMONAS ROSEOLA, St., vol. i. p. 408, x 600 (Stein). 



16-18. CRYPTOMONAS OVATA, Ehr., vol. i. p. 404 (Stein). 16 and 17, Adult animalcules, 

 x 600 ; 1 8, young example. 



19-21. CRYPTOMONAS EROSA, Ehr., vol. i. p. 404 (Stein). 19, Adult animalcule 

 enclosing large ovate germ-mass, x 600; 20, encysted animalcules; 21, 

 example dividing by longitudinal fission. 



22.. STYLOCHRYSALIS PARASITA, St., vol. i. p. 405. Social group attached to the 

 cell-wall of a Eudorina, one example at a dividing by transverse fission, 

 x 500 (Stein). 



23. DINOBRYON JUNIPERINUM, Eichw., vol. i. p. 411, dimensions unrecorded 

 (Eichwald). 



24-26. UVELLA VIRESCENS, Ehr., vol. i. p. 406 (Butschli). 24, Socially united cluster 

 of five zooids, x 1200 ; 25, example treated with acetic acid, showing central 

 spl^roidal nucleus or endoplast, and two laterally developed pigment -bands ; 

 26, an animalcule dividing by longitudinal fission. 



27. SYNURA (RHODESSA) GRIMSELINA, Pty. sp., vol. i. p. 412, x 300 (Perty). 



28, 29. CHRYSOPYXIS BIPES, St., vol. i. p. 408 (Stein). 28, Colony fixed to a node of 

 Mougeotia, x 600 ; 29, isolated example showing the two spine-like 

 posterior prolongations of the lorica, by which adhesion to the confervoid 

 algal is secured. 



30-33. EPIPYXIS UTRICULUS, Ehr., vol. i. p. 409 (Stein). 30, Social colony, x 600, 

 at a lorica with network-like markings, probably indicating the presence or 

 previous existence of sporular elements ; 31, a more abnormal and closely 

 aggregated colony ; 32, an isolated animalcule with its protective lorica 

 more highly magnified ; 33, an example dividing by oblique fission, as 

 observed by the author. 



34-40. DINOBRYON SERTULARIA, Ehr., vol. i. p. 409. 34, Compound detached poly- 

 thecium, x 250 ; 35, a similar but smaller colonial aggregation, x 1000, 

 at a an animalcule derived by recent fission, attached to the margin of the 

 parent lorica, and constructing for itself by exudation a new protective 

 sheath ; 36, an isolated animalcule with its investing lorica, x 2500 ; e, 

 coloured eye-like pigment-spot ; am, amylaceous corpuscle ; st, thread-like 

 contractile pedicle or footstalk ; n, nucleus or endoplast ; c v, contractile 

 vesicle ; 37, example dividing by transverse fission (Butschli) ; 38, encysted 

 example (Butschli) ; 39 and 40, examples of encystment, after Stein. 



41. DINOBRYON STIPITATUM, St., vol. i. p. 410, x 500 (Stein). 



