625 
having the same shape as those of the 1-seriate stories of the com- 
posite rays (Pl. 6 Photo 5). 
Descruptwomestethe elements. 
I. Vessels. R. and T. 28 to 40 u, about 33 u 
being the commonest size. Roughly circular cylinders. 
| | Transverse walls placed very obliquely; with scalari- 
ee form perforations and horizontal rungs, see fig. 1). 
| el Walls thiekened, but not remarkably so and the 
CA lignified wall much thinner than that of the adjacent 
El cells (fibre-tracheids); — with irregularly placed 
aes | simple round or slightly oval pits (p. 86). 
SS | Il. Mibre-tracheids R. and T. 15 to 50 (?) u, the 
| En) | radial dimension often somewhat smaller than the 
| | tangential; 4- to 6-, generally 6-angular. Walls in 
i \ ‘NY most cases thickened, the lumen of the cells */, or 
| \\ 7 less that of its whole diameter (see Pl. 8 Photo 10 
| | and text-fig. 1); — with bordered pits, on the 
Hen tangential walls at least as numerous as on the radial 
Aptiana radiata (p. 86, Pl. 8 Photo 10, and text-fig. 1); arranged 
Stopes. Transverse in 1 and in a few cases in 2 slightly irregular rows, 
wall of vessel; show- „ot very closely arranged in vertical position, each 
ing scalariform per- : . rea ; ; 
foration.Reproduct- being spaced at a distance from its neighbour roughly 
ion of textfig. 2 of equal to its own diameter; borders of pit-chambers 
Mrs. Stopes’ paper. ; 
circular (p.-86). 
Il. Wood parenchyma. Cells on a transverse section somewhat 
elongated in the direction of the circumference of the vessels. (Pl. 8 
Photo 10 and text-fig. 1). Walls thickened ; — with only simple pits. 
Contents more blackened than that of other cells (p. 86). 
IV. Cells of medullary rays. Walls thickened; pitted (see Pl. 8 
Photo 10 m, and p. 89). 
Having completed this description we compared it with the general 
descriptions of the wood-anatomy of the several families, published 
in the two first volumes of our “Mikrographie des Holzes”’. It was soon 
found that the only family with which the characters of Aptiana 
coincided and did so in a very satisfactory manner, was indeed that 
of the Vernstroemiaceae. 
1) On p. 86 Mrs. Srores says: “In longitudinal section not many of the vessels 
show the character of their walls, but those that do, have broad, simple scalariform 
pitting (see text-fig. 2)”. If a regular Linnean description had been made, this 
mistake would no doubt have been avoided. 
41 
Proceedings Royal Acad. Amsterdam. Vol. XY. 
