History of infusoria, including the desmidiaceae and diatomaceae, British and foreign / by Andrew Pritchard.

  • Andrew Pritchard
Date:
1861
Catalogue details

Licence: Public Domain Mark

Credit: History of infusoria, including the desmidiaceae and diatomaceae, British and foreign / by Andrew Pritchard. Source: Wellcome Collection.

Provider: This material has been provided by Royal College of Physicians, London. The original may be consulted at Royal College of Physicians, London.

    969/1074 (page 949)
    DESCRIPTION OF THE ENGRAVINGS. PLATE I. (Desmids). Figures 1 to 14. Cosmarium margaritiferum, &c., under different stages of develop- ment- 1 3. Frond, enclosing vesicles filled with moving granules; 3. Supposed early state of moving granules; 4. Early stage of seK-fission ; 5. Fission-products escapmgthe enclosmg waU of parent ceU; 6. Separation completed; 7. Sporangium stUl connected with parent frond; 8. Same with mammilliform spines; 9. Sporangium further developed; 10,11. Supposed matm-e sporangia; 12. Same, broken and empty; 13,14. Yomig supposed products of sporangial contents: aU after Mrs. Thomas, TM. 1855. [We are disposed to think that one or two other species besides Cosmariiun margaritiferum are here confounded. 4, we suggest, may possibly be C. ceelatum or C. cristatum, showing nascent segments; 7' C. Broomei, the empty frond to the right showing a segment not yet fully developed; 8 and 9 appear to us as probably more likely to represent the conjugated state and sporan- gium of C. bioculatum, of which figs. 10, 11, 12, may represent tlie ultimately extruded inner membrane, while figs. 13 and 14 may ti-uly be the young fronds developed fi-om their contents, and which have not yet commenced vegetative self-division.] 15-17. Sphajro- zosma vertebratum (Ealfs): 15. A portion of a filament seen in f. v. x200; 16.tr. v. X400; 17. 8. V. X400. 18,19. Micrasterias papillifera (Breb.) : 18. f. v. XlOO; 19. Spo- rangium X200. 20. M. rotata (Ealfs), f. v. xlOO. 21. M. radiosa (Ag.), f. v. XlOO. 22. M. Crux-Melitensis (Ealfs), f. v. X100. 23-25. Euastrum Didelta (Ealfs): 23. f. v. with endoclu-ome; 24. e. f. in f v.; 25. tr. v.: all x200. 26. E. rostratum (Ealfs), f. v. X400. 27,28. Xanthidium armatum (Br6b.): 27. f. v.; 28. s. v.: both x200. 29, 30, Arthi-odesmus octocornis (Ehi-.): 29. var. j8, f. v.; 30. var. a, f. v.: both x400. 31-34. Staurastrum cuspidatum (Breb.): 31. f. v.; 32. showing the nascent segments ; 33. tr. v.; 34. e. v.: all x400. 35,36. Ankistrodesmus falcatus (Ealfs), x400.. 37-39. Sceno- desmus obtusus (Meyen), after Niigeli, showing segmentation of the cell-contents, x300. 40-42. S. caudatus, after Niigeli, x300. 43. Same, segmentation of cell-contents, x400. 44 45. A few marginal cells of Pediastrum Selenasa (Kg.)=P. pertusum (?), after NageH, x300. 46^8. P. (Anomopedium) integrum (Nag.): 46. Xl50; 47. x400; 48. B. V. X400. 49-51. Coelastrum spharicum (Nag.): 49. x200 ; 50, 51. x300. 52. Pediastrum Ehrenbergii (Braun), after Braun, x4(X». 53. P. Selenasa (Kg.) [non Ealfs, = P. pertusum], after Nageli, X150. 54, 55. Coelastrum cubicum (Nag.), after Nageli, x300. 56-58. Sorastrum spinulosum (Nag.): 56. x300; 57, 58. x600. 59-61. Pediastrum Boryanum, var. brevicornis, after Braun: 59. Two mai'ginal cells, one empty, the other discharging the original inner membrane closely investing the micro- gonidia; 60. The same half an hour afterwards, considerably dilated, the microgonidia each with a pointed hyaline beak, and at first slowly moving ; 61. Mici'ogonidia, eventually emitted, swimming freely: all x300. 62, P. granidatum (Kg.). 63. Brood of macrogonidia emerged from shell of old frond, x400. 64. A few marginal cells of an old frond, some empty, the cell-contents of others undergoing previous segment^ntion, and one discharging the inner membrane investing the brood of macrogonidia (Braun), x400. 65. Same as 63, seen from the edge, X 400. 66. Same, seen in f. v., the cells now slightly emarginate, x400. 67. Same, four hours after the macrogonidia have ceased to move, the marginal cells now di'awn out into horns, but not yet having asstimed their proper form, and all exliibiting spaces between, not yet having become closely applied to each other, X400. 68,69. P. Boryanum: microgonidia treated with tinctm-e of iodine and sul- phuric acid, showing the vibratUe cilia, the slightly retracted couteuts, and a nucleus, X500. (Figs. G3-Gy after Braun.) PLATE 11. (Desmids). Figures 1 &< 5. Closterium Leibleinii (Kg.), x200; 1. Afroi\d filled with ondoehromo, and an empty one lying across it (the latter shows the central siit uro); 5. Sjiorangium lying between the conjugated, and now empty fronds. 2 & 6. Ulostcrimn striolatum (Elir.), X 100: 2. A frond with endochrouio, showing tlio longitudinal fdlels and the single row of large gronules; 6. Two empty conjugated fronds, sliowing the striaj and the orbicular