Pityostrobus macro cephalus, L. and H. A Tertiary 
Cone showing Ovular Structures. 
BY 
C. P. DUTT, B.A., 
Late Scholar of Queens' College , Cambridge . 
With Plate XV and two Figures in the Text* 
Introduction. 
ALTHOUGH a number of cones of Abietinean affinity have been 
recorded from Cretaceous and Tertiary rocks, in almost all cases the 
internal organization of the ovules has been passed over without comment. 
This is, of course, partly due to unfavourable conditions of preservation, but 
even where slides showing a considerable amount of anatomical detail have 
been in existence for a long time, the older writers have generally contented 
themselves with a brief description of the main morphological features. 
The material which forms the basis of the present description consists 
in the first place of a number of slides belonging to the British Museum. 
All but one of these are known to have been prepared from two cones 
which form part of the Cowderoy Collection bequeathed to the British 
Museum in 1852. Up to now these two cones have been regarded as 
representatives of two distinct species, but, as will be seen, examination of 
the internal structure seems to afford little justification for this view. The 
larger cone, Pinites macrocephalus of Carruthers, has furnished only thick 
longitudinal sections, while from the other specimen have been cut two 
transverse sections and two thin longitudinal sections of a small portion 
of the base. A third transverse section is not definitely referred to either 
of the above cones, but it agrees in all details with P. ovatus , and has 
probably been cut from the same cone as the others. 
I should like here to record my great indebtedness to Professor Seward, 
who placed the slides at my disposal and who has throughout given 
me much valuable assistance and advice. Further, owing to the kindness 
of Dr. Arber I received permission to have sections cut from a specimen of 
P* maci'ocephalns which was presented to the Sedgwick Museum, Cambridge, 
some years ago by Mr. C. H. Edgell. With the help of these slides (two 
[Annals of Botany, Vol. XXX. No. CXX. October, 1916.] 
