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 a a 

 two uniflagellate, monadiform germs, produced from the same, x loco ; 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 ingestjng 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 OCTOCOSTATUS, St., vol. i. p. 438 (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., v >'. 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 ast figure indicates 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. Butschli. 



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 faecal 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 1 200 ; 42, encysted state. 



