PLATE XXIV. 



EXPLANATION. 



Fig. 



i-io. DIPLOMASTIX CAUDATA, Duj . sp., vol. i. p. 432. — I, Typical adult form, X 800 ; 

 2 and 3, examples with prolonged posterior extremities ; 4, conjugation of 

 two animalcules; 5, spore-groups, imbedded in decaying hay-fibre, at^« 

 two uniflagellate, monadiform germs, produced from the same, x 1000 ; 6, 

 sporocyst with four rounded macrospores, x 1000 ; 7, group of elongate 

 spores, with cyst-wall dissolved, X 1000 ; 8, sporocyst with germ emerging, 

 after Stein; 9 and 10, animalcule ingesting and having ingested a bacillus 

 filament, after Stein. 



II, 12. DIPLOMASTIX SALTANS. Ehr. sp., vol. i. p. 433, X 800 (Stein). 



13. DIPLOMASTIX AFFINIS, S. K., vol. i. p. 433, X 800. 



14, 15. Heteronema acus, Ehr. sp., vol. i. p. 430, x 400 (Stein). 



16, 17. Heteronema globuliferum, Ehr. sp., vol. i. p. 430, x 400 (Stein) 



18-20. Sphenomonas OCTOCOSTATA, St. sp., vol. i. p. 439 (Stein). — 18 and 19, Lateral 

 and ventral aspects, x 400 ; 20, quiescent or encysted phase. 



21-23. Sphenomonas quadrangularis, St., vol. i. p. 438 (Stein). — 21, Normal adult 

 type, X 400 ; 22, the same viewed vertically to its long axis ; 23, zooid 

 dividing by longitudinal fission. 



24,25. Anisonema truncatum, . St., vol. i. p. 435 (Stein). — 24, Dorsal, 25, ventral, 

 aspects, X 450. 



26-30. Anisonema grande, Ehr. sp., vol. i. p. 434. — 26, Axial, and 27, dorsal, aspects, 

 X 400, the four flagella present in the last figure indicate approaching fission 

 (after Jas.-Clark) ; 28 and 29, dorsal and ventral aspects, the zooid in the 

 first instance containing two germinal masses, x 450, after Stein ; 30, zooid 

 after O. Biitschli. 



31-34. Entosiphon sulcatum, Duj. sp., vol. i. p. 437 (Stein), x 400.— 31, Zooid 

 enclosing ovate germ-mass ; 32, living, and 34, dead examples, with their 

 horny pharyngeal tubes protruding. 



35,36. Anisonema ludibundum, S. K., vol. i. p. 435, x 1200.— 35, Animalcule in 

 lateral view discharging fsecal matter from its posterior extremity ; 36, 

 dorsal aspect, showing the two anteriorly located contractile vesicles. 



37-39. Anisonema intermedium, S. K., vol. i. p. 436. — 37 and 39, dorsal and lateral 

 aspects, X 1 200 ; 28, two young animalcules, possessing as yet only a single 

 posterior anchoring flagellum, or gubernaculum, x 1 200. 



40-42. Sterromonas formicina, S. K., vol. i. p. 420. — 40 and 41, Dorsal and lateral 

 aspects, X 1200 ; 42, encysted state. 



