(122) 
may be caused by worm burrows; Phytopsis, which may 
be a coral; Plumulina, which may be a hydroid; Dendro- 
phycus, which may be current-markings; and Dictyolites, 
which are most likely sun-cracks. All of these, however, 
have at one time or another been definitely regarded as 
the remains of marine plants and were originally so de- 
scribed and classified. 
In these cases and in wall-case No. 2 are also the remains 
of the earliest fern-plants and their allies (Pteridophyta) 
of Devonian and Carboniferous age, represented by 
Lepidodendron, Sigillaria, and Calamites, and the early 
seed-bearing plants, the cone-bearers (Gymnosperms), 
represented by Cordaites, with the fossils under Trigono- 
carpon, Rhabdocarpon, and other genera. 
Floor-cases Nos. 2 and 3 and wall-case No. 3 contain 
specimens of Carboniferous age, for the most part ferns or 
fern-like plants, which were originally described as ferns, 
but which are now placed in a different group, the Cycado- 
filicales, that is, plants that had characteristics of both 
the ferns and the sago-palms, but more closely related to 
the latter than to the ferns. 
Floor- and wall-cases No. 4 are devoted to specimens of 
Carboniferous plants in the genera Lepidodendron, Sigil- 
laria, and Stigmaria, in order to show the variation in the 
arrangement and shape of the leaf scars and the difference 
between specimens with the bark preserved and those 
which have been decorticated. 
Floor-case No. 5 contains types of early Mesozoic time: 
Triassic and Jurassic Periods. The plant remains in this 
case are mostly sago-palms or cycads, with a few cone- 
bearers and fern-plants, besides specimens of the so-called 
“Glossopteris flora,” a flora of uncertain botanical relation- 
ship, which flourished in the transition period between 
Paleozoic and Mesozoic time, particularly in the southern 
hemisphere, and may yet be represented by the living 
South African genus Stangeria, a cycad having leaves with 
pinnately arranged forking veins, similar to ferns. 
