956 DESCRIPTION OF THE ENGEAVINGS. 



nomorum tingens, x2o0. 8. Doxococcus ruber. 9. Bodo intestinalis, x300. 10 & 21. 

 Monas Lens. 11a, b. Cercomonas lobata. 12 a, b. C. truncata. 13 «, 6. Amphimonas 

 dispar. 14. Cliilomonas Paramecivim, X 380. 15. Monas elongata. 16. Trepomonas agiUs. 

 17. Monas globulosa. 18. Chilomonas granulosa. 19. Monas attenuata. 20. Cercomonas 

 acuminata. 21. Monas Lens (two figs.). 22. Cercomonas longicauda. 23. C. Globulus. 

 24. Spiromonas volubilis. 25. Pleuromonas jaculans. 26. Ileteromita exigua. 27. Tre- 

 pomonas agilis. 28 a, b, c, d. Trichomonas Batrachorum. 29. Cryptomonas ovata, x 300. 

 30. Prorocentrum micans. 31. Lagenella euchlora. 32. Cryptoglena conica. 33, 34. 

 Trachelomonas Volvocina. 35 a, b, c, d. Chonemonas Scln*ankii : c, d. Yar. C. unifilis. 

 36. Astasia hsematodes. 37-39. Euglena sanguinea. 40, 51, 54. E. viridis, encysted 

 and in act of fission. 41,42. E. Pyrum, x400. 43,44. E. longicauda. 45. Ambly- 

 opliis vii'idis. 46. Euglena viridis. 47. Chlorogoniimi euchlorum. 48 a, b, c. Astasia 

 limpida. 49, 50. A. contorta. 52. Euglena spirogyra. 53, 55. Eutreptia viridis. 

 56. Zygoselmis inaiqualis. 57. Bacterium triloculare. 58. Spirochseta plicatilis. 59. 

 Spirillum Undula. 60. Vibrio Bacillus. 61. Spirillmn Undula. 62. Vibrio Bacillus, 

 63. Spirodiscus fidvus. 64. Vibrio Rugula. 65, 66. Sporonema gracile. 67, 68. Spi- 

 rulina plicatilis. 69. Zoogloea Termo : a mucoid mass of Vibrios, the individuals of which 

 are equivalent to Bacteriiun Termo of Dujardin. 



PLATE XIX. (Phytozoa). 



Figure 1. Chromatium Weissii. 2. Menoidium pellucidum. 3. Tetramitus descissus. 

 4-6. Mallomonas Ploslii. 7 a, b, c. Phacotus \iridis, 8. Anisonema Acinus. 9, 10. 

 Trypemonas volvocina. 11. T. cylindrica. 12, Chonemonas acuminata. 13, 14. Lepo- 

 cinclis Grlobulus. 15. Hirmidium inane. 16. Clilamydomonas pulvisculus. 17. Dinema 

 griseolum. 18, 19. Eutreptia viridis. 20-31. Clilamydococcus (Protococcus) pluviahs, 

 its forms and development, after Cohn : 20. A still cell revived after desiccation ; 21. Cell 

 with nucleus ; 22. Still cell with dense external coat ; 23. Fission of primordial within the 

 parent cell ; 24. Fission of a still cell, wall of parent cell become gelatinous ; 25. Division 

 of secondary cells ; 26. Fission of encysted cell into four secondary, and 27. into thirty- 

 two cells ; 28. The several cells produced set free, a membrane tin-own out around one ; 

 29. An irregular-shaped, Euglena-Hke zoospore; 30. A cell on the point of assuming 

 the motile condition; 31. A very small, globidar, encysted zoospore. 32-37. Gonium 

 pectorale : 32. A perfect tabular frond ; 33. Detached cells, showing their contractile 

 vesicles ; 34. Four cells (gonidia) united by the radiating tubular processes of their external 

 membrane, into which the green contents do not enter ; 35. Excepting one cell of the 

 tablet, all the others have proceeded, to a greater or less extent, by the process of fission, to 

 generate " daughter cells," or the rudimentary gonidia to form new tablets ; each one is 

 still sm-rounded by the " mother-cell " wall ; 36. A tablet, of which the original gonidia 

 are widely separated, and loosely held in sitii by the external cell-wall ; fission has further 

 proceeded, and rudimentary tablets formed from each original gonidium, consisting of 

 sixteen " daughter cells" (macrogonidia) ; in 37 the connecting bonds are quite dissolved, 

 and the sixteen secondary tablets set free: all x500. 38-58. Stephanosphiera pluvialis, 

 exliibiting its forms and modes of development: 38, An equatorial view; 39. Lateral 

 view, gonidia spindle-shaped, with protoplasmic elongations ; 40. Division of gonidia into 

 four "daughter cells"; 41. Fm-ther divided into eight, vmited in an annular form; 42. 

 A fiu-ther-advanced stage, macrogonidia now forming distinct families, like the one repre- 

 sented in fig. 57 ; 43. Division of gonidia preparatory to forming microgonidia ; 44. A 

 full-growm resting cell ; 45. Beginning of division of a resting cell ; 45. Division into 

 four, outer membrane disappeared; 47. Tapering of one end of secondary or "daughter" 

 cell preparatory to formation of ciha ; 48, 49. Naked zoospores ; 50. Encysted zoospore 

 (gonidium); 51. Resolution of all the gonidia, except one, of a matm'e Stephanosphaera 

 into microgonidia; 52. Detached ciliated microgonidia; 53. An encysted zoospore with 

 protoplasmic elongations of the primordial cell ; 54, 55. Di\ision of encysted zoospore ; 

 56. More advanced stage of division ; 57. A young family of eight cells ; 58. Another, with 

 the cellular envelope still visible within the membrane of the mother cell: XaOO (Cohn). 

 59-69. Pandorina Morum: 59. Perfect form, with sixteen gonidia, side view; 60. The 

 same, polar view ; 61. A gonidium, side view ; 62. A frond with the gonidia divided ; 

 63. A more advanced frond ; 64. A young frond of fig. 63, after formation of cilia, set 

 free ; 65, 66. Young fronds, gonidia pushed close togetlier ; 66. A polar view ; 67. End or 

 polar view of a frond like 65, the gonidia of which are encysted and tmmed red and their 

 gelatinous envelope nearly dissolved ; 68. A side -view of tlie same ; 69. A single encysted 

 gonidium. Figs. 59 to 68 (except 61 ), X 100 ; figs. 61 & 69, x400 (Henfrey), 



