Scott and Mas ten.— -The Structure of Trigonocarpus . 133 
PLATE XII. 
Fig. 9. Transverse section across micropylar beak at a still higher level. Slide 1943 Wild (S). 
Magnification 6. 
t.m. triangular micropyle; s.t. sclerotestal tissue surrounding micropyle ; /. limiting layers of 
sarcotesta. 
Fig. 10. Transverse section across beak at a still higher level. Same specimen as Fig. 9 
Slide 1942 Wild (S). Magnification 6. 
s.t. small amount, of sclerotic tissue surrounding micropyle which was apparently slit-like in 
form ; L limiting layers of sarcotesta. 
Fig. 11. Transverse section of extreme tip of micropylar beak. Opening of micropyle 
apparently blocked. Slide 1952 Wild (S). Magnification 32. 
b. dark cells surrounding micropyle ; /. light-coloured zone surrounding micropyle ; h. hypo- 
dermis of sarcotesta ; e. epidermis of sarcotesta. 
Fig. 12. Longitudinal section of the lower part of a seed of Trigonocarpus Parkins oni . The 
section is not strictly radial and therefore does not pass through the chalazal bundle. The attach- 
ment of the apparently free nuceilus is shown. Slide R. 763 (M). Magnification 7. 
n. nuceilus ; p. chalazal attachment of nuceilus ; s.b., s.b. position of sarcotestal bundles one of 
which is shown more highly magnified in PI. XIV, Fig. 25; s.t. sclerotestal tissue at base of stalk 
of seed. 
Fig. 1 3. Longitudinal section of upper part of seed showing pollen-chamber and beak. Slide 
224 (R). Magnification 6. 
p.c . pollen -chamber occupying apex of nuceilus ; c. lateral cushion at side of pollen-chamber ; 
p. pad of tissue probably displaced from the floor of pollen-chamber ; be. beak of pollen-chamber ; 
s.t. sclerotesta at base of micropylar beak. 
Fig. 14. The pollen-chamber beak of Fig. 13 more highly magnified. Magnification 107. 
w. wall of beak consisting of palisade-like cells (see PL XIV, Fig. 32') ; t. possible tracheides 
forming inner portion of wall of beak. 
Fig. 15. Portion of the nuceilus showing the covering of epidermal cells. From the lower part 
of a seed. Slide 222 (B). Magnification 40. 
n.e. nucellar epidermis ; i.n. inner tissue of nuceilus. 
Pig. 16. Carpolithes alata {Trigonocarpus Parkinsoni ?). From a specimen in the Copenhagen 
Museum originally contained in the Hutton Collection at Newcastle. Magnification a. 
s.t.b. outer surface of sclerotesta bounding the micropylar beak ; sa. impression of sarcotesta ; 
s.t. sclerotesta of body of seed ; c. substance filling cavity of seed. 
Fig. 17. Another specimen from the same collection. Magnification 2. 
m. b. micropylar beak ; sa. impression of sarcotesta; s.t. sclerotesta of body of seed ; c. substance 
occupying cavity of seed. 
PLATE XIII. 
Fig. 18. Carpolithes alata ( Trigonocarpus Parkinsoni ?). Specimen from the Hutton Collection 
in the Newcastle Museum. Showing internal cast of body of seed with sclerotestal covering and 
internal cast of micropylar canal. 
r. ridge of cast ; s.t. sclerotestal covering ; m.b. micropylar beak (internal cast). 
Fig. 19. Trigonocarpus Oliveri. Longitudinal section of seed showing characteristic £ coffin 
shape ' of the sclerotesta. Slide S. 28, b. (O'). Magnification 6-J. Loc. Shore-Littleborough (roof- 
nodule). 
n. nuceilus ; s.t. sclerotesta ; p. } p. processes of sclerotesta representing annular ridge at base 
of seed. 
Fig. 20. Another vertical section of the same specimen, more median below but less median 
above. Slide S. 28, c. (O). Magnification 6J. 
n . nuceilus ; p.c. pollen-chamber; s.t. sclerotesta ; sa. sarcotesta (?) preserved in the angles of the 
sclerotesta ; p-,p. processes due to annular ridge at base of seed ; r. } r., r. three of the longitudinal 
ridges of the seed which are cut through on account of the obliquity of the section. 
