4i 
Trigonocarpus Shorensis , sp. nov . 
My thanks are also due to Dr. D. H. Scott and to Prof. F. E. Weiss 
for the loan of preparations. To Dr. Scott I am also indebted for permitting 
me to examine the more important sections in his unique collection of 
Trigonocarpus Parkinsoni , without which an adequate comparison between 
the two seeds would not have been possible. 
The same methods have been employed in the reconstruction of the 
present seed as were used in the investigation of Conostoma oblongum and 
C. anglo-germanicum } These have been recently described in a separate 
article 2 and need not be recapitulated here. 
The sections that furnish data for the following account are all cut 
from seam nodules obtained from the well-known locality at Shore Little- 
borough, re-opened through the generosity of the late Mr. Sutcliffe. To 
mark its origin it has been thought appropriate to designate this seed by 
the specific name of Shorensis. 
■-4-32.fr 
II. General Features. 
The seed with which the present investigation deals was of large size, 
approximately elliptical in form, and circular in transverse section. The 
exact limits at either end cannot with certainty be determined, but the total 
length was probably considerably over four centimetres. In breadth the seed 
attained a maximum diameter, about half-way up, of nearly two and a half 
centimetres. 
Although specimens showing the actual attachment of the seed are 
wanting, the chalazal end certainly tapered 
towards its insertion and, judging from 
the general direction of the surface curva- 
ture, followed a more gentle curve inwards 
to the apex. 
The testa comprised three or perhaps 
four layers, the two outer of which consti- 
tuted a broad sarcotesta remarkable for 
the presence of a number of scattered 
secretory sacs and representing nearly one- 
third of the total width of the seed. 
Within the sarcotesta was a hard 
sclerized shell bearing three salient ridges 
which extended from the base to the apex. These ridges were sym- 
metrically placed around the body of the seed, and from the chalazal end to 
about a third the height of the sclerotestal shell were present three more 
ribs much less pronounced than the former, and occupying positions inter- 
mediate between them. 
/ — 
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$32.e 'hi... 
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' 1 5 22 A _ i ' 
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...... S 32.V 
*31* 
Text-fig. 2 . Plottings on the trans- 
verse section of the S. 32 series. 
1 Oliver and Salisbury : On the Structure and Affinities of the Palaeozoic Seeds of the Conosto?na 
group. Ann. Bot., vol. xxv, 1911. 2 Ann. Bot., vol. xxvii, No. cvi, 1913. 
