400 
Fig. 36. 
Fig. 37. 
Fig. 38. 
Fig. 39. 
Fig. 40. 
Fig. 41. 
Fig. 42. 
Fig. 43. 
ON THE STRUCTURE AND AFFINITIES OF STEPHANOSPERMUM. 
Stephanospermum caryoides, n. sp. 
Median longitudinal section of apex of seed, showing the micropyle (m.), perimicropylar area, 
and strands; n, summit of pollen-chamber. x10. S'la. (See p. 373.) 
Portion of a hair or branching strand of cells from the perimicropylar area, xX 330. Slc. 
(See p. 374.) 
Apex of nucellus with insertion of nucellar beak. n.e., epidermis of nucellus ; the pollen- 
chamber is below. A nearly horizontal fissure traverses two-thirds of the region drawn, 
x 65. S'lz. (See p.374.) 
Tracheides from the nucellar wall. x 370. S'/1». (See p. 375. 
Pollen-grain p. in text-fig. 2 (p. 380). a and b, internal cells; c, blister-like excrescence of 
outer wall; fr.s., indication of triradiate mark on the grain. x280. Sin (Seep. 380.) 
Pollen-grain fragment p. in text-fig. 2. The cell contains a secondary reticulum of possible 
antherozoid mother-cells. w,exospore. x 650. S'la. (See p. 381.) 
Pollen-group p.’, p. from fig. 18. nf, intact pollen-grain showing the triradiate mark; 
D, pollen-fragment of two internal cells, a and 4, latter represented in fig. 20. x 310. 
S'la. (See p.381.) 
Two conjectured antherozoids in the petrified mucilage on the floor of the pollen-chamber. 
x 465. S'la. (See p. 383.) 
ie 
