OF THE FOSSIL PLANTS OF THE COAL-MEASUKES. 
269 
Figs. 95-99. Trigonocarpon olivceforme. Five consecutive longitudinal sections, of 
which fig. 95 is the most peripheral, and fig. 97 the most central one. 
a. Exotesta or sarcotesta. b. Hard endotesta. c. Lagenostomal cavity. 
d. Micropyle.. f. Nucular membrane, g. Perispermic membrane often 
collapsed. All these figures are of the natural size. 
Figs. 100-108. Series of transverse sections, of which fig. 100 is made through the 
lower part of the triangular micropyle, and fig. 108 near the chalazal base of 
the seed. The others are intermediate in the order of their numbers. The 
letters of reference are the same as in the longitudinal series. 
109. 
Fig 
Fier 
chalaza. Enlarged 108 diameters. 
110. Transverse section of the sarcotesta immediately below the chalaza; enlarged 
108 diameters. The central aperture is doubtless that through which a 
vascular bundle entered the seed. 
111. Vertical section of a portion of the testa. Enlarged 62 diameters. 
a. Cells of sarcotesta. b. Endotesta. 
112. Transverse section of the same, from part of fig. 106. 
113. Upper extremity of the nucular membrane of fig. 96. Enlarged 15 diameters. 
c. Lagenostome. f. Nucular membrane, g. Perispermic membrane. 
114. Similarly enlarged portion of fig. 97. 
115. Similarly enlarged portion of fig. 98. 
115 a. Hexapterosp ermum Noggerathi, nat. size. 
115 5. H. Noggeratlii , enlarged 3 diameters. 
116. Cardiocarpon anomalum 1 Superficial aspect. Enlarged 11 diameters, 
a. Exotesta, b. Endotesta or nucular membrane 1 d. Micropyle. ■re. Nucleus. 
117. Slightly oblique longitudinal section of fig. 116. Enlarged 15 diameters. 
a. Exotesta, b. Endotesta or nucular membrane, g. Perispermic mem- 
brane. i. Chalaza. 1c. Funiculus, n. Nucleus. 
118. Vertical section of another example of Cardiocarpon anomalum. Enlarged 
22 diameters. 
a. Exotesta, b. Endotesta. d. Micropyle. i. 
Fig. 119. Vertical section of another specimen of the same. 
a. Exotesta, b. Endotesta. d. Micropyle. i. 
120. Parenchymatous cells of the perisperm of fig. 116. 
121. Cardiocarpon compressum. Approximate external form. 
122. Cardiocarpon acutum of Lindley and Hutton. 
123. Vertical section of the upper half of a seed of Cardiocarpon compressum , 
made on the plane of its greatest diameter. Enlarged 11 diameters. 
124. Transverse section of the same seed from the lower end of fig. 123. 
125. Transverse section of the base of the same seed passing through the chalaza. 
2 p 
Fig:. 
Fi 
Fig 
Fis: 
Fig 
Fig 
Fio\ 
Fm 
Fig. 
Fig. 
Fie. 
Fig:. 
Chalaza. 
Enlarged 22 diameters. 
Chalaza. 
MDCCCLXXVII. 
