30 Oliver and Salisbury . — On the Structure and 
The fact that the ‘blow-off’, in all the sections where preserved, is 
still in situ, seems to point to its either having functioned differently or to 
the specimens in each case being immature ; the presence of pollen in at 
least one of these preparations seems to render the former alternative the 
more probable. 
Owing to the greater complexity of its outline, especially at the apex, 
this seed presents very varied appearances when cut in different planes of 
obliquity; this point is sufficiently well illustrated by specimen J. 6 (PL III, 
Fig. 31), which cuts the seed obliquely, entering near the apex of a major 
rib and passing out at the base above the insertion of the stalk. The major 
rib on the left (R 1 ) and the minor rib on the right at the apex (r 2 ) are both 
exaggerated by the obliquity ; but owing to the curvature of the proximal 
end of the seed this does not apply to the corresponding ribs at the base, 
which are cut nearly transversely. The upper lateral ribs (r\ R 2 ) are 
followed for some way, and consequently appear as obtuse angled appen- 
dages of the testa, whilst the lower lateral ribs (r 3 , r 4 ) are rendered cuspi- 
date. The major ribs are respectively R 1 , R 2 , R 3 , R 4 , and the minor ribs 
r 1 , r 2 , r 3 , r 4 . 
5. The Nucellus . 
The structure of the nucellus of Conostoma anglo-germanicum closely 
resembled that of Conostoma oblongum in all essential points. The dimen- 
sions of the various parts differed as between the two seeds, the most 
notable divergence being in the height of the nucellus, which reached 
to 5 mm., as compared with 37 mm. in Conostoma oblongum. As in that 
seed, the lagenostome rests in a depression of the plinth (specimens J. 3 and 
9, PL III, Figs. 28 and 30, Ig .), whilst the plinth itself is characterized by 
the same peculiar features that have been so fully described in the case of 
Conostoma oblongum. As we find the preservation of Conostoma anglo- 
germanicum to be generally inferior to that of Conostoma oblongum , we 
shall restrict our detailed account of the former to the material points. 
6 . The L agenostome. 
The lagenostome resembled that of Conostoma oblongum in form, 
though its dimensions are slightly larger. Its height is 0*19 mm., and the 
breadth 0-26 mm., as compared with 0-15 mm. x 0-23 mm. in the allied seed. 
The cells of the wall appear somewhat more robust than in C. oblongum and, 
as in that seed, the cavity of the lagenostome is destitute of contents. Here 
also the appearance of a two-layered wall is suggested locally as in specimen 
J. 9, on the right-hand side low down (PL III, Fig. 25, Ig.) ; the explanation 
is doubtless the same as in C. oblongum (see p. 18) and depends upon the 
sectioning of a curved surface combined with post-mortem change. The 
