45 + 
Solms-Laubach. — On Bennettites. 
Fig. ii. Fragment from the periphery of an exactly transverse slice through 
the spadix, showing the sections of the seeds in the homogeneous external layer 
with its indentations. Internally to the seeds are the transverse sections of the 
seed-stalks, and of the small interstitial organs between them ; some of the cata- 
phyllary leaves round the spadix are also indicated. Drawn by Berjeau. 
Fig. 12. Similar fragment of a transverse section through the spadix with the 
surrounding cataphyllary leaves, but taken from a lower region of the spadix in 
which there are no seeds. The external layer with its notches answering to the 
areolation is very distinct. Drawn by Berjeau. 
PLATE XXVI. 
Figs, i, 2, 3, 4. Transverse sections of the seed, showing the two cotyledons of 
the embryo with their plane surfaces touching one another and their vascular 
bundle-traces ; from photographs by Gepp of Carruthers’ original preparations 
(see pi. 59, fig. 4, loc. cit.). In Figs. 2 and 3 the hard layer of the testa with its 
lighter cells is plainly marked. Figs. 2 and 4 show fissures beside the embryo and 
between its cotyledons, filled with structureless mineral substance. 
Figs. 5, 6. Longitudinal sections of embryos from one of Carruthers’ original 
preparations photographed by Gepp ; a in both figures the growing-point. The 
cleft between the cotyledons is very distinct in both figures ; and in Fig. 5 the 
tissue also of the cotyledons. It is more difficult to distinguish in Fig. 5 the 
central strand in the hypocotyl and the attachments of the bundles which pass 
into the two cotyledons. Compare the diagrammatic representation in PI. XXV, 
Fig. 4. 
Fig. 7. Attempted representation of a portion of a tangential section just 
beneath the surface of the spadix. The numerous irregularly- shaped lighter 
places are intended for parts filled with pyrites and disintegrated in slicing. The 
darker round figures are the transverse sections through the pointed extremity of 
the testa of the different seeds touched by the section. Some of them are united 
by straight lines, an indication perhaps of the areolation of the surface of the spadix. 
The figure is very imperfect, but it is the best I could get after many attempts to 
photograph the section had produced no serviceable picture. It was done with 
Winkel’s drawing-apparatus and is slightly magnified. 
Fig. 8. Sketch of the longitudinal section of a seed, showing, but not very 
distinctly, the conical prolongation of the nucellus (Williamson’s nucular 
membrane), which would probably inclose the pollen-chamber, if there is one. 
Fig. 9. Photograph of a radial longitudinal section through the seminiferous 
upper extremity of a spadix. The embryos with their two cotyledons are seen 
with perfect distinctness in the seeds. 
Fig. 10. Longitudinal section of the entire seed, showing the shape and 
structure of the tubular apical portion of the testa ; a the points of section of the 
circular zone where the middle stratum of the testa thins out, and the sudden 
narrowing of the entire process begins. 
