The Structure of the Palaeozoic Seeds, Trigonocarpus 
Parkinsoni, Brongniart, and Trigonocarpus Oliveri, 
sp. nov. 1 Part I. 
BY 
D. H. SCOTT, M.A., LL.D., F.R.S. 
Lately Hon . Keeper of the Jodrell Laboratory , Royal Botanic Gardens , Kew. 
AND 
ARTHUR Je MASLEN, F.L.S. 
Formerly Marshall Research Scholar at the Royal College of Science. Lecturer on Geology at the 
South-Western Polytechnic , Chelsea. 
With Plates XI-XIV. 
Contents. 
PAGE 
I. Introduction 89 
II. Previous Work on the British forms of Trigonocarpus 94 
III. Trigonocarpus Parkinsoni, Brongn . 96 
General Characters 96 
The Testa 99 
Sarcotesta 99 
Sclerotesta 106 
Inner Flesh .110 
The Chalazal End of the Seed 111 
The Micropylar End of the Seed. The Question of a Wing 115 
The Nucellus and Pollen-Chamber 119 
IV. Trigonocarpus Oliveri, spec, nov 124 
V. The Casts and Impressions . 127 
References 131 
Explanation of the Plates 132 
I. Introduction. 
I N January last we published a preliminary note on the structure of 
Trigonocarpon olivaeforme 2 , giving a short account of a reinvestigation 
of a large number of the seeds. The object of the present paper is to illus- 
1 [The investigation recorded in the present paper was carried out jointly by my colleague and 
myself at the Jodrell Laboratory. The part of the paper now published, giving the results of our 
joint observations, has been written entirely by Mr. Maslen. In the second part we hope to discuss 
the more general questions arising out of our work, 
D. H. Scott.] 
3 Scott and Maslen, 1906. 
[Annals of Botany, Vol. XXI. No. LXXXI. January, 1907. 
