1 14 Oliver . — On Phy so stoma elegans , Williamson , 
strands, and the lacunae ; the secretory zone is much narrower than in the previous photograph, and 
the tapetum is unusually distinct ; lying in the central space is the contracted prothallus, which is 
limited by a very delicate membrane (nt.g.). M. H. 370 (see pp. 81 and 97). 
Fig. 3. Across the apex, showing ten tentacles (with tubular hairs) surrounding the top of the 
pollen-chamber. The lower tentacles are cut transversely, the upper series somewhat obliquely and 
nearer to their insertions. 1. lacuna accompanying vase, strand; p . pollen-chamber; ps. female 
prothallus; t. tentacle; t. tentacle out of place; t.h. tubular hairs; tp. tapetum; s.z. secretory 
zone; v.b. xylem strand. M. H. 371 (see pp. 82, 91). 
Fig. 4. Median longitudinal section through the seed-apex. The insertions of two tentacles 
are shown on the right and left (^ c , t 5 ) ; t l} t 2 , t s , and t 4 , other tentacles seen in section ; numerous 
tubular hairs are present on the tentacles — well shown to the left of t 0 ; p. pollen-chamber — with 
a pollen-grain on the right-hand side ; sn. space or sinus between pollen-chamber wall and inner 
side of tentacle ; x. fracture in wall of nucellus below pollen-chamber; the large central cavity is 
the embryo-sac or megaspore chamber, which tapers into a papilla above. U. C. L., R. 92 (Shore), 
x 37 (seep. 87). 
Fig. 5. A portion of the wall of the seed on the right of Fig. 2, enlarged. Two ribs, r x and r 2 , 
are shown, the cells of the filling-tissue with contracted vesicles. Corresponding with the ribs are 
two lacunae (/.) and vascular strands (v.b.). Between the bundles the cells of the integument show 
a well-marked arrangement in radial files (r.f.). Within the bundles is the secretory zone (s.z.), 
with special development on the bundle radii, and within this the tapetum (//.), about five cells 
deep. M. H. 370. x 64 (see pp. 89, 98). 
Fig. 6. A single rib from the wall of the seed, from the top right-hand side of Fig. 2, enlarged. 
The xylem strand (v.b.), which is slightly displaced, is well shown. Other references as in Fig. 5 
(see p. 96). 
Fig. 7. Several tentacles from the lower side of Fig. 3, enlarged. The interlocking of the 
epidermal cells where the tentacles are in contact is well shown, t.h. tubular hairs of the epidermis ; 
e. small-celled epidermis; l. lacuna. No-traces of the vascular strands are preserved. M. H. 371. 
X 64 (see pp. 87, 89). 
Fig. 8. An oblique section across the pollen-chamber region of a seed. Above are six tentacles 
entirely free ; below four ribs not yet separated. The tubular hairs (t.h.) with dark contents are 
especially well shown on the tentacles, p.c. pollen-chamber (the upper edge of the section passes 
below its orifice) ; ms. apical papilla of megaspore ; s.z. sacs of the secretory zone crowded together 
below the cavity of the megaspore ; v.b. xylem strands of the ribs — the dark spots near them are 
detached secretory sacs. U. C. L., R. 93 (Shore), x 37 (see pp. 88, 98). 
Fig. 9. Part of transverse section from about the middle of a seed showing ribs, lacunae £l.) 
and tubular hairs (t.h.). The tapetum (tp.) has separated from the zone of secretory sacs (s.z.). 
The cells of the integument show the ‘ thick’ type of preservation. U. C. L., R. 91 (Dulesgate). 
x 40 (see p. 89). 
Fig. 10. An oblique tangential section through the upper part of a seed. The plane of section, 
starting from a point well below the middle of the seed, proceeds obliquely upwards through the 
embryo-sac (mg.s.) ; at the apex it strikes the wall of the megaspore papilla (mg.p.), which it 
cuts tangentially. It emerges close to the orifice (o.p.c.) of the pollen-chamber (p.c.). U. C. L., R. 94 
(Dulesgate). x 10 
Fig. 1 1 . Part of an oblique section across the apex of a seed. The circular space at the top is 
the pollen-chamber (p.c.) ; four tentacles are cut very tangentially, the plane of section traversing 
the investment of tubular hairs (t.h.) close to the body of the tentacles. U. C. L., R. 70, c (Shore), 
x 37 (see p. 88). 
Fig. 12. A tangential section through the apex of a seed. The plane of section falls outside the 
apical papilla of the megaspore, so that the pollen-chamber (p.c.) appears as a broad, oval cavity. 
Several tentacles (t.) and groups of tubular hairs (t.h.) are cut through, s. sinus between pollen- 
chamber and tentacles ; pi. plinth. S. 1753 (Dulesgate). x 15 (see p. 90). 
PLATE VI. Figs. 13-23 (Drawings). 
Fig. 13. Transverse section of a seed with twelve ribs just below the level at which the 
tentacles separate. At the top of the figure the sinus (sn.) is visible, and in this region the secretory 
sacs have disappeared from the tissue of the ribs. s.z. secretory zone ; tp. tapetum ; /. lacuna ; v.b. 
xylem strand. U. C: L., R. 95 (Shore), x 34 (see pp. 85, 90, 98). 
