Danaea simp lici 'folia, Rudge. 1 1 3 
same as that of Angiopteris , as figured by Jonkman and 
Farmer 1 , as also of Marattia Douglasii , Baker, figured by 
Campbell 2 . Jonkman pointed out the fact that in Angio- 
pteris the number of neck-cells in two of the vertical rows is 
frequently three, while in the other two it is four, sometimes 
four and five, rarely two and three respectively 3 . The last 
of these three conditions occurs most frequently in the case of 
Danaea simplicifoiia , in which there are only two cells in two 
of the vertical rows and three in the other two. Jonkman 
likewise noted the variability in the formation of the accessory 
cells {ml), which are cut off from the cells adjacent to the 
developing archegonia. In D. simplicifoiia this variability 
seems to be carried further, so that comparatively rarely were 
archegonia seen with the full complement of these cells. The 
corresponding cells of the antheridium (cf. Figs. 9 and 12, mi) 
are much more constant, a fact which is readily understood, 
since they are doubtless functional in aiding the discharge of 
the spermatozoids at maturity. In Fig. 13 the structure 
marked sp. is in all probability a spermatozoid, ov. is the 
ovum. In Fig. 14 the condition of the neck, already referred 
to, is quite obvious, there being only two neck-cells on one 
side and three on the other. In the case of Fig. 13 it was 
seen that the two rows behind, which could not be figured, 
consisted each of three neck-cells 4 . 
Embryo. 
Embryos in the earlier stages of development were not 
found, the youngest being represented in Fig. 15. It was 
obtained from the prothallus of Fig. 2, and forms a good 
sequel to Prof. Campbell’s Fig. 22 5 . Most of the divisions 
of the latter are still fairly readily recognizable in the former. 
This figure was taken from a hand-section, and its exact 
1 Loc. cit. , Fig. 1. 2 Loc. cit. (a), Fig. 16. 3 Loc. cit., p. 216. 
4 For theoretical considerations concerning the affinities of the Marattiaceous 
archegonium, see Campbell, loc. cit. (a), p. 7. 
5 Loc. cit. (a). 
