Woodburn. — Spermatogenesis in certain Hepaticae 313 
Figs. 25-44. Marchantia . (Figs. 25 A to 28 A are drawn from spermogenous tissue.) 
Fig. 25 a. Spermogenous cell in resting condition. 
Fig. 25. Chromatin in a central mass. Nuclear cavity very finely granular or filled with 
a homogenous substance. 
Fig. 26. Nuclear cavity as in Fig. 25. Chromatin in two or three lumps. 
Fig. 27. Nuclear cavity a little more coarsely granular. Chromatin nearly ready for the 
formation of chromosomes. Cytoplasm unevenly granular. 
Figs. 28 and 28 A. Spindle stages. 
Fig. 29. Just previous to the last division. Cytoplasm containing two dense bodies. 
Fig. 30. The same stage as 29, but more bodies in the cytoplasm. 
Figs. 31 and 32. Formation of the oblique spindle with the cytoplasmic bodies occupying the 
poles of the spindle. 
Figs. 33 and 34. Spindle stages. Chromosomes in equatorial plate. 
Fig. 35. Anaphase. Bodies at poles disappearing. 
Figs. 36 and 37. Anaphase and telophase, bodies at poles having disappeared or nearly so. 
Fig. 38. A pair of sperm cells. One showing blepharoplast primordium. 
Figs. 39 and 40. Single sperm cells. Blepharoplast beginning to lengthen. 
Fig. 41. Two antheridial cells containing respectively a pair of sperm cells seen from the edge. 
Figs. 42 and 43. Single sperm cells showing the course of the blepharoplast. The stage is 
about the same as in Fig. 41, but from a different view. 
Fig. 44. Mature sperm after escaping from the antheridium. 
Figs. 45-60. Fegatella. (Figs. 45-52. Before the diagonal division.) 
Fig. 45. Nucleus of a cell in resting condition. 
Fig. 46. Cell with nucleus in early prophase. 
Fig. 47. Later prophase. Chromatin forming an irregular spireme of a double nature. 
Fig. 48. Spireme about as in Fig. 47. Cytoplasm showing indications of spindle formation. 
Fig. 49. Showing number of chromosomes. 
Figs. 50 and 51. Spindle stages. Chromosomes in equatorial plate. 
Fig. 52. Telophase. 
Fig. 53. Formation of spindle in oblique division. 
Fig- 53 A. Oblique division. Equatorial plate and bodies at poles. 
Fig. 54. Anaphase. No definite bodies persisting in region of poles. 
Fig. 55- Pair of sperm cells. Blepharoplast cannot be identified. 
Fig. 56. Pair of sperm cells. Numerous granules scattered throughout cytoplasm. 
Fig. 57. Blepharoplast primordia. Sperm cells seen from the edge. 
Fig. 58. One sperm cell seen from the side. Blepharoplast beginning to lengthen. 
Fig. 59. A pair of sperm cells. Blepharoplast much elongated and nuclei drawing out along 
the rear portion of the blepharoplast. 
Fig. 59 A. Somewhat later than Fig. 59. The blepharoplast disappears behind the nucleus. 
Fig. 60. A mature sperm after escaping from the antheridium. 
Figs. 61 and 62. Two spindles from spermogenous tissue of Asterella. 
