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. 
Tas. 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 5. 
Fig. 55. The same preparation focused deeper so as to show the embryo-sac, a, and its boundary cells, 2. 
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. Ts = 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 papillæ before the canal is visible. 
Fig. 60. Similar papilla: 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 archegoni i ibi inst 
goma, one of which exhibits th i 
Aan dares ibits the mucilaginous — hanging out 
Fig. 64. Vertical section passing thro 
of them. 
"um 65 & 66. Vertical sections of archegonia, passing through the canals and emóryo-sacs. 
d E Vertical section of z portion of a prothallium passing through two archegonia. 
18. 68. More highly magnified view of three archegonia, differently focused; the side one shows the 
canal through the transparent walls; the middle di j 
; la: 
showing through. € displays the embryo-sac and embryonal vesicle 
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. | 
ig. 71 E7 section pissing 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 aborti i | 
i ve archegonia, with the wall f à 
embryo-sacs coloured deep brown. à S of the widely-opened canals and the 
ugh four archegonia; b, the cells bounding the embryo-sac of oné 
