PLATE XXII. 



Fig. 13. — Heterophri/s marina, Hertwig et Lesser ; k, endosarc ; 

 r, ectosarc ; n, nucleus ; the distinction between the clearer endosarc and 

 the darker ectosarc has not, according to the authors, found sufficient 

 expression in the lithograph. (Drawn under same amplilication as Fig. 6.) 



Fig. 14. — -Heterophrys spbiifera, Hertwig et Lesser ; c, c, contractile 

 vacuoles ; n, a central, rather dark, rounded structure (endosarc ? or 

 nucleus ?). 



Fig. 15. — Ueliophri/s variabilis, Greeff ; a, " outer sarcode," with the 

 fine short bacillar bodies ; b, pseudopodia. 



Fig. 16. — Same, beginning to alter the form of the body and of the 

 pseudopodia. 



Fig. 17. — Same, seen under pressure on the covering-glass; a, outer 

 stratum; i, pseudopodia ; c, nuclei ; </, vacuoles. 



Fig. 18. — Same, likewise under pressure of the covering-glass and 

 reptant, when the body passes from a globular or discoid into an elon- 

 gate figure ; also the at first simple radiary pseudopodia become 

 repeatedly branched. 



Fig. 19. — Raphidiophrt/s elegans, Hertwig et Lesser. Eight indi- 

 viduals combined with one another by protoplasm-processes into a cluster 

 and surrounded by a common skeleton-layer composed of semi-annular 

 spicules ; in one individual the nucleus is evident. 



Fig. 20.—Choudropus viridis, Greeff. (x 400 ?) 



Fig. 21. — Hedrioci/slis pellucida, Hertwig et Lesser. Fully grown 

 example with, t, shell, s, stipes, n, nucleus, and c, c, two contractile 

 vacuoles. 



Fig. 22. — Same, younger example, the stipes formed, but not yet the 

 shell; still, self-division has already set in; t, shell; 5, stipes ; n, n, 

 nuclei ; c, contractile vacuole. 



Fig. 23. — Clathrulina elegans, Cienk. ; zoospore with two flagella, 

 nucleus {n), and several contractile vacuoles. 



Fig. 24. — Same; the zoospore, come to rest, begins to forms its stipes, 

 evident as a sharply contoured circle {s) on the surface of the body ; v, v, 

 food-vacuoles ; c, c, contractile vesicles. 



Fig. 25. — Same, now stipitate, but otherwise naked ; v, v, food-vacuoles ; 

 c, c, contractile vesicles. 



Fig. 26. — Actinolophus pedimculatus, Eilh. Schulze. An example 

 with pyriform body, in which the excentrically posed nucleus, the central 

 globular corpuscle, and the colouring granules, can be seen. X 400. 



Fig. 27. — Same, an example in which the deposition of the siliceous 

 plates has begun, whilst the pseudopodia are nevertheless fully extended ; 

 two nuclei. X 800. 



