237 
with the integument, as far as the level at which the 
arms separate. 
At its apical side a large pollenchamber is formed, into 
which the nucellus rises like a conical hollow papilla ,.like 
the bottom of a wine bottle” (p. 78). 
The nucellus is filled up for the greater part with a 
large megaspore or embryosac and it contains numerous. 
secretory cavities. 
$ 8 Trigonocarpus Parkinsoni Brogn. 
Literature: Arber (3), Hooker and Binney (73), 
Oliver (102, 103), Scott and Maslen (134). 
The seed is oval-shaped, with a length, without the 
micropyle of 2,5 cM. and a diameter of 1,5 cM. The 
micropylar region is very long and has a length equal to 
that of the body of the seed, but it never is found pre- 
served very well Occasionally a seed is found with a 
micropyle twice as long as the seedbody, but it is possible 
that this belonged to an other species. The total length 
therefore is about 4—5 cM. 
In transverse section the seed is nearly triangular, cau- 
sed by the three prominent ribs on the testa, which cha- 
racteristic has induced the name T'rigonocarpus. 
The testa is composed of three to four layers. The 
middle one is most characteristic, is hard and formed by 
thick-walled sclerotic cells, and therefore is called the 
sclerotesta. Outside is a layer of delicate thin walled cells, 
the sarcotesta, whereas the innermost layer the endotesta 
too is composed of a delicate tissue. 
The sarcotesta has often disappeared, but when preser- 
ved, it seems to be largest at the base and the upperpart 
of the seed. In these regions it is less differentiated from 
