138 MR. HENFREY ON THE DEVELOPMENT 



Fig. 45. Drawing representing the presumed character of a perfect spermatozoid, derived from the exami- 

 nation of numerous specimens. 



Fig. 46. Imperfect spermatozoids. 



Fig. 47. Other forms, where the coils were distinct, but which were sketched while in motion, so that the 

 cilia were not seen. 



Fig. 48. Side view of an antheridium after it had discharged its spermatozoids. The lid is still attached, 

 but the internal membranes have acquired a brown colour. 



Fig. 49. Another specimen from which the lid has been wholly detached. 



Fig. 50. Portion of a proliferous old prothallium with marginal, mostly effete, antheridia. 



Fig. 51. Slightly magnified view of the under side of a perfect prothallium, in which the cushion-like 

 thickening has been developed. 



Fig. 52. Magnified view of the region near the notch on the lower surface of a similar prothallium, 

 bearing archegonia in various stages. 



Fig. 53. More enlarged view of a smaller portion with several sterile archegonia. 



Tab. XVI. 



Fig. 54. View of a nascent archegonium focused to the (under) surface of the prothallium. At a is the 



cell of the general surface overlying the embryo-sac, which is seen through, as are the cells 



bordering it, marked b. 

 Fig. 55. The same preparation focused deeper so as to show the embryo-sac, a, and its boundary cells, b. 

 Fig. 56. A similar view to fig. 54, where the cell above the embryo-sac already exhibits cross lines, indi- 

 cating its division into three, preparatory to growing out into the papilla ; c shows the cellule 



(embryonal vesicle), with a nucleus formed in the embryo-sac ; b, the boundary cells. 

 Fig. 57. The same figure focused deeper: a, the embryo-sac; b, its boundary cells; c, the embryonal 



vesicle. 

 Fig. 58. Lateral views of archegonia, showing the gradual development of the papilla. 

 Fig. 59. More advanced papilla? before the canal is visible. 

 Fig. 60. Similar papillae seen from above. 



Fig. 61. Lateral view of an archegonium in which the canal of the papilla is becoming evident. 

 Fig, 62. Vertical section through the thickness of the cushion-like mass of the prothallium, passing in 



various situations through archegonia. 

 Fig. 63. Vertical section of two archegonia, one of which exhibits the mucilaginous filaments hanging out 



from the canal. 

 Fig. 64. Vertical section passing through four archegonia ; b, the cells bounding the embryo-sac of one 



of them. 

 Figs. 65 & 66. Vertical sections of archegonia, passing through the canals and embryo-sacs. 

 Fig. 67. Vertical section of a portion of a prothallium passing through two archegonia. 

 Fig. 68. More highly magnified view of three archegonia, differently focused ; the side one shows the 



canal through the transparent walls ; the middle displays the embryo-sac and embryonal vesicle 



showing through. 

 Figs. 69 & 70. Views of archegonia obtained without sections, focused to show the contents of the canals 



and embryo-sacs, distinguishable through the transparent walls. 

 Fig. 71. Vertical section passing through two archegonia ; the left figure appears to be of one just fertilized, 



the right figure exhibits merely the base of a dead archegonium. 

 Figs. 72 & 74. Views of dead abortive archegonia, with the walls of the widely-opened canals and the 



embryo-sacs coloured deep brown. 



