PLATE 25. Infusoria. 



Figure 

 1 . Tegument of Paramecium aurelia, dried, showing the depressions at different 



foci, &c. (!NTR. p. xxxii.) 



2a. Paramecium aurelia, with globules of sarcode ; 2 b, free globule of sarcode, 

 with numerous vacuoles. 



3. Stentor Mulleri, E. 



4. Tintinnus inquilinus, E. 



5. Trachelius lamella, D., a and b. 



6. Trepomonas agilis, D. 



7. Trichoda angulata, D. 



8. Trichodiscus sol, E. 



9. Trichomonas vaginalis, D. 



10. Trichomonas limacis, D. 



1 1 . Trinema acinus, E. 



12. Trochilia sigmoides, D., ventral view. 



13. Trochilia sigmoides, D., dorsal view. 



14. Urocentrum turbo, E. 



15. a, Uroleptus piscis, E.; b, U. lamella, E. 



16. Uronema marina, D. 



1 7. Urostyla grandis, E. 



18. Uvella virescens, E., and 6. 



19. Vaginicola crystallina, E. 



20. Cothurnia imberbis, E. 



21 a. Vorticella nebulifera, E. ; 215, body separated by division; 21 c, separate 

 body, a, mouth ; b, nucleus (auct. testis, E.) ; c, contractile vesicle (vesic. 

 seminal., E.). 



22a.Zootkamnium arbuscula, E. ; 22 b, separate body. 



23. Zygoselmis nebulosa, D. a, b, in different states of contraction. 



24. Arcella vulgaris, E., half side view of young, with expansions extended. 



25. Acineta-stage of Opercularia articulata, E. a, dendritic nucleus ; b, envelope ; 



c, tentacles ; d, vacuoles ; e, group of fat-granules ; f, enlarged stalk. 



26. Vorticella microstoma, E., full-grown, a, O3sophagus ; b, peristome ; c, con- 



tractile vesicle ; d, nucleus ; e, gemma or bud ; f, mature bud. 



27. Vorticella microstoma, E. (old), encysted upon its extended stalk, with its 



nucleus, contractile vesicle, and retracted cilia. 



28. Vorticella microstoma, E. (young), encysted upon its contracted stalk. 



29. Vorticella microstoma, E., encysted and stalkless. a, cyst ; c, contractile 



vesicle ; d, nucleus. 



30. Isolated nucleus of an old Vorticella microstoma, 



31 . Actinophrys-stage of Vorticella microstoma. The cyst is partly separated from 



its contents ; the nucleus and contractile vesicle are visible. 



32. Two of the above in conjugation. 



33. Two Podophrya-stages of Vorticella microstoma in conjugation. 



34. Cyst of Vorticella microstoma discharging its brood of germs, a, gelatinous 



substance, containing b, the germs ; c, neck-like orifice of parent-vesicle ; 



d, cyst ; e, parent-vesicle. 



35. Spirochona gemmipara, Stein, a, peristome with its funnel-shaped process ; 



b, nucleus ; c, gemma or bud. 



36. Acineta-stage of the same, a, tentacles ; b, nucleus ; c, mature swarm -germ, 



37. Paramecium chrysalis, E., undergoing longitudinal division. 



38. Glaucoma scintillans, E., undergoing transverse division. 



