JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XXI, 



Illustrating Mr. Archer's Resume of Recent Contributions 

 to our Knowledge of " Freshwater Rhizopoda/^ 



Fig. 1. — Troglodytes zoster, Gabriel. Two examples in conjugation; 

 a, fusion of the pseudopodia, n, nucleus with nucleolus, s, the test, w, 

 the upper, larger vacuoles, g-z, the granulated zone, with the "zoster"- 

 granules. (AmpliBcation not stated.) 



Fig. 2. — The same, showing the cleavage of the coarsely granular 

 germ-mass. 



Fig. 3. — The same, " monostigma-form ;" /n, a monostigma, g, early 

 granulation, st, the " stigma." 



Fig. 4. — The same, fusion of the monostigma-form ;_/, the connecting 

 process. 



Fig. 5. — The same, " diplostigma-form ;" I, the stigma-poles not 

 coalesced, st, stigmata. 



Fig. 6. — The same, the first indication of the nucleus. 



Fig. 7. — The same (a young example complete); n, nucleus, v, vacuoles, 

 p, the linear pseudopodia. 



Fig. 8. — Presumably a young state of Cochliopodium, after Hertwig 

 and Lesser. 



Fig. 9. — Dilrema Jlnvum, Archer (showing pseudopodia extended and 

 median nucleus). X 400. 



Fig. 10. Pelu>7i!/xa pcdustriSjGreeff, in a contracted globular condition, 

 richly charged with food- and sand-particles. At the margin the 

 hyaline cortical protoplasm projects in waves from the dark body. 

 X 60. 



Fig. 11. — The same, young, x 300 — 400; a a, the shining bodies, 

 " Glanzkorper," showing also the vacuoles and bacillar bodies. 



Fig. 12. — The same, nuclei and their probable development into the 

 shining bodies ; b, nuclei of the ordinary size ; k, some of these, the 

 "nucleoli," show the punctiform centre, others the central cavity. 



Fig. 13. The same, the "Amoebae;" «, contractile vacuole ; b, nucleus. 



Fig. 14. — The same. Their modification into — 



Fig. 15. — The same, the flagellate condition. 



Fig. 16. — Byalodiscus rubicundus, Hertwig et Lesser, seen from 

 above ; a, hyaline colourless ectosarc ; b, the endosarc, containing the 

 brownish granules and discoloured food particles, with several (contrac- 

 tile ?) vacuoles, c c, and a pale grey-coloured spot, corresponding to the 

 nucleus, n ; d d, folds of the ectosarc. (' Zeiss. E. oc. III.') 



Fig. 17. Dactylosphcerium vitreum, Hertwig et Lesser, yellow form; 

 e, a pseudopodium at the moment of retraction ; b b, balls of food; c c, 

 non-contractile vacuoles. 



Fig. 18, — D. vitreum, green form, the whole superficies beset with 

 minute protoplasmic processes. 



Fig. 19. — Leptop/irys cineren, Hertwig et Lesser. The interior so 

 packed with food that no certainty as to a nucleus can be gained. 



Fig. 20.— hptophrys elegans, Hertwig et Lesser ; nu, nuclei. 



Fig. 21. — Araclmnla impaticiis, Cienk. X 320. 



Fjg. 22. — Gymnophrys cometa, Cienk. X 400, 



Fig. 23. — Plakopus ruber, E. Schulze. A large example, with distinct 

 nucleus, numerous vacuoles, its membranous pseudopodia, and a few 

 short filamentary processes. X 500. 



Fig. 24. — Masligumosba aspera, E. Schulze. X 500. 



