57 
numerous secondary veins, which are somewhat more prominent, whilst the 
other characters, namely, the deep indentation of the rounded obtuse apex, 
and the stilt leathery texture, are common to both. 
Locality and Horizon.— With the preceding species. 
Collection. — It. M. Johnston. 
Sapotacites aciirasoides, sp. nov. 
Plate V, Fig. 9. 
Sj). Char. — S. foliis breviter petiolatis, coriaceis, ovatis, apice acutis, 
basi productis, margine integerrimis ; nervatione dictyodroma ; ncrvo primario 
firmo, recto, excurrente ; nervis secundariis tenuibus, subangulis 70-80° 
orientibus, ramosis, approximatis ; nervis tertiariis tenuissimis. 
Ohs.—' The form, texture, and venation of this leaf bespeak one of the 
Sapotacese. In this family we find in Acliras much similarity of leaf, on the 
one hand in the living Acliras Sapota, and on the other hand in the fossil A. 
lycohroma. But similar leaves occur also in Sideroxylon, and in a few others, 
so that a more exact determination of the fossil Sapotaceae must be left for 
future researches. In the meantime the leaf from the Derwent strata may be 
referred to Sapotacites. 
As vicarious species, we may regard the S. solidus, Ilccr, sp.,* in the 
Tertiary Flora of the Arctic Zone, and the S. Copeanus, Ett.,t in the North 
American Tertiary Flora. 
Locality and Horizon. — ■'With the preceding species. 
Collection. — (?) B. M. Johnston. 
* Sapotacites solidus ( Myrica solida, Heer, loc. cit., vol. v, No. 3, p. 28, PI. V, figs. 2, 3.) 
Ohs. — The remarkably stiff and coriaceous texture of the leaf quoted from Sachalin, the extremely delicate 
approximate secondary veins, which proceed from a strong midrib, and branch at times towards the margin, and 
finally the almost parallel margins and the obtuse base decidedly indicate one of the Sapotaceie. Among described 
fossil species it approaches, as regards form and texture, most nearly Sapotacites angustifolim, Ettingshausen, from 
Bilin ; in the latter, however, the secondary veins are not preserved, probably on account of their delicate 
nature. Among living plants we find similar leaves in species of Mimusops, Bassia, Acliras, in Chrysophyllum 
pauciflorum and O. angustifolium, and several others. 
t Sapotacites Copeanus, sp. nov. ( Sapindus coriaceus, Lesq., loc. cit., PI. XLIV, fig. 13.) 
Sp. Char . — Foliis breviter petiolatis rigide coriaceis, oblongo-lanceolatis integerrimis, margine reflexis, 
nervatione camptodroma, nervo primario valido, nervis secundariis tenuissimis, vix conspicuis. 
Ohs . — Among hitherto described fossil species of North America none of the Sapotaeea; are to be found. It is 
highly probable, however, that the family, which is at present so strongly represented in America, was not 
wanting in the North American Tertiary Flora. The remains may not as yet have been detected in the Tertiary 
strata of North America, or perhaps they have been overlooked or confounded with other fossils. Among the 
plant fossils described and figured by Lesquereux, in the work above quoted, I believe I can recognise a member 
of the Sapotacem in the leaf fossil defined as Sapindus coriaceus. Such a stiff leathery leaf with reflexed margin 
occurs neither in living nor in hitherto published fossil Sapindacea; ; on the other hand, very similar leaves 
are found in the Sapotaeea;, for example, in Bumelia and Chrysophyllum. The very unimportant asymmetry 
which is observed in the leaf fossil quoted, may be a casually abnormal form, especially as such an unequal 
development of the sides of the leaves is not rare in Sapotaeea;, and more particularly in the genus named (compare 
11a 67-88 K 
