124 Scott and Mas ten . — The Structure of Trigonocarpus. 
which somewhat resembles tracheal thickenings. The question as to 
whether these elements are really tracheides or not must be left open 
for the present, but in view of the absence of tracheides from the wall 
of the pollen -chamber in both Trigonocarpus and Stephanospermum we are 
inclined to think that the elements in question are non-tracheal. 
On the whole the pollen-chamber with its beak in Trigonocarpus 
Parkinsoni resembles in a somewhat striking manner the Cordaitean pollen- 
chamber as shown in Renault’s well-known figure 1 , while there is also fair 
agreement with the corresponding structures in a recent Cycadean ovule as 
in Stangeria 2 . 
IV. Trigonocarpus Oliveri, spec. nov. 
This is a new species of Trigonocarpus which has kindly been com- 
municated to us for description by Professor F. W. Oliver, F.R.S., after 
whom it has been named. The locality from which it was obtained— 
Shore-Littleborough in Lancashire — is a comparatively new one for petri- 
fied fossil plants, the colliery having recently been reopened for scientific 
purposes by Mr. W. H. Sutcliffe, F.G.S. This rich locality has yielded 
many well-preserved and interesting fossils which are found in nodules from 
the roof of the workings, as well as in the ordinary nodules or coal-balls 
lying in the coal-seam immediately below. 
Trigonocarpus Oliveri occurs in a roof-nodule, and is at present repre- 
sented by one specimen only, which has been cut by Mr. Lomax into the 
four longitudinal sections shown in PL XIII, Figs. 19-22. As no trans- 
verse sections are available for examination we are unable to fully diagnose 
the new form, but, as far as can be judged from the longitudinal sections, it 
is similar in many respects to Trigonocarpus P arkinsoni, and we have pro- 
visionally placed it in the same genus. At the same time there are differ- 
ences from the ordinary form which are quite sufficient for its separation as 
a distinct species. 
Trigonocarpus Oliveri is a somewhat smaller seed than T. P arkinsoni. 
None of our sections pass radially through the seed from base to apex, 
so that the true length of the seed is not shown. The longest section, that 
shown in PI. XIII, Fig. 19, has a length of about i-8 cm., or slightly less 
than that of T. Parkinsoni , specimens of which, excluding the micropylar 
beak, vary between just over 2 cm. and 2*5 cm. in length. The maximum 
width of T. Oliveri across the body of the seed, measuring to the outside of 
the sclerotesta, is nearly *9 cm., or half the length. In T. P arkinsoni the 
corresponding maximum width varies between about 1*3 and 1 -6 cm. The 
new seed is therefore somewhat shorter and narrower, and is also slightly 
narrower in proportion to its length, than most specimens of T. Parkinsoni. 
The sarcotesta is not preserved, excepting, perhaps, slight traces of it at the 
1 Renault (’81-85), T. i, PI. 14 , Figs. 5 and 6 . 2 e.g. Lang (’00), PL XVII, Fig. 15 . 
