THE PALZOZOIC SEED LAGENOSTOMA OVOIDES. 489 
PLATE 23. 
Fig. 9. Upper part of oblique longitudinal section passing through the micropyle. Note the 
Fig. 19. 
papillate epidermal cells at the apex, the projection of the lagenostome beyond 
the mieropyle, and the almost complete closing of the pollen-chamber by the 
“stopper” (р. 484). В.8. x 70. 
. Lower part of oblique longitudinal section passing through the central papilla at the 
base of the seed. Їп the débris (probably a pinnule) just beneath the seed 
secretory sacs occur similar to those found in the seed (cf. р. 471). В. 48 (2). 
x 38. 
. Oblique longitudinal section showing.the prothallus with dark cell-like masses 
round the edge (cf. р. 479). This seed is infected with fungal hyphe better 
shown ір fig. 13. В. 29. х 25. 
. Oblique section across the apex of the seed showing the ridges and grooves and the 
closed (or unopened) lagenostome (cf. p. 484). An enlarged drawing of part of 
the epidermis is given in fig. 3. В. 26. x 48. 
. Enlargement of the lagenostome cf fig. 11 to show fungal hyphe. R.29. x 85. 
‚ Section across the apex, more oblique than fig. 12, showing the bevelling of the 
lagenostome wall, and, to the right, the pollen-chamber, also the vascular bundles 
traversing the loculi. В.216. x 40. 
‚ Oblique section through the lagenostome and canopy of a beautifully-preserved seed. 
Figs. 17 and 19 are from the same section, and fig. 20 from the same seed. 
В. 20 b (2). хоз. 
‚ Somewhat oblique transverse section through the canopy and lagenostome. Note 
the double loculus to the right with two vascular bundles; also the group of 
smaller cells in the middle of the central cone. В. 206 (1). х 93. 
. Apex of fig. 15 enlarged. К. 20 0 (2). x 105. 
, Partially crushed section across the body of the seed, to show what is believed to 
be the first stage in the formation of the prothallus (cf. fig. 11 and p. 479). R. 24. 
x 1s. 
Base of lagenostome and plinth of fig. 15 enlarged. Note junction of plinth and 
lagenostome wall, and the sharp outlines of the torn cell-walls at the edge of the 
central сопе. R. 20 0 (2). x 125. 
. Section at base of seed from which fig. 15 is taken. (The darkened part to the left 
of the space within the wall is not organic, but due to the structure of the mineral.) 
В. 20 а (2). x23. 
PLATE 24. 
. Upper part of oblique longitudinal section passing through the pollen-chamber. 
Shows a micropylar ridge overlying a septum, and two “blisters " on the epidermis. 
В. 41 (1). х 30. 
22. Part of fig. 21 enlarged to show “ blisters,” and exfoliation of cuticle a little higher 
up (ef. p.467). В.41(1). x 90. 
3. A branched fungal hypha from the cavity of the seed in R. 49. x 470. 
. ‘Transverse section across a piece of the cuter shell of the seed occurring in К. 36. 
x 176. Note thick laminated walls and cf. with fig. 28. 
‚ Septete hypha occurring close to the apex of the seed in В. 40 (1). х 340. 
96. Spores germinating in the body of the seed R.49. х 470. In one case the 
germinal tube has already branched twice (cf. p. 479). 
