264 Proceedings of the Royal Physical Society. 
Samaropsis, Goppert, 1864. 
Foss, Flora d. perm. Form., p. 177. 
“Seeds with membranaceous wings, compressed, mono- 
spermous.” ! 
This genus is more fully defined by Zeiller in his “ Flore 
foss. d. bassin houil. d. Valenciennes,” p. 643. 
Seeds generally very small, flat, lenticular in section, 
oval in shape, pointed or slightly emarginate at the summit, 
and sometimes cordate at the base, completely bordered by 
a membranous wing, which is more or less developed. 
An examination of Goppert’s figures shows that this 
description of Samaropsis by Zeiller coincides completely 
with the plants included in it by its author. 
The third genus in which some of these little seeds have 
been placed is Cordaicarpus, Geinitz. 
Cordaicarpus, Geinitz, 1862. 
Cordaicarpon, Dyas, p. 150. 
“Lenticular or compressed globular, ovate to roundly 
cordate, seed surrounded by a close envelope of leathery 
consistency, to which a short stem is attached. Probably 
the fruit of Cordaites. Type: Carpolithes Cordai, Geinitz.” 
Zeiller includes Cardiocarpus, Brongt. (in part), in Cordai- 
carpus, Geinitz, and defines the latter genus thus:— 
Cordaicarpus, Geinitz. 
Zeiller, Flore foss, d. bassin houil. d. Valen., p. 645, 1888. 
Seeds flattened in transverse section, elliptical or len- 
ticular, in form oval or orbicular, acuminate or obtusely 
pointed at the summit, often a little emarginate at the base, 
surrounded by a keel more or less prominent, surface 
smooth. 
Goppert and Fiedler in 1857? founded the genus Cyelo- 
carpus for circular seeds having the same general characters 
+ “Fructus samaroideus membranaceus, compressus, margine alatus 
monospermus.” 
2 Die foss. Friichte d. Steinkohlen Form., by 1. Fiedler—Nov. Act. Acad. 
nat. curios, vol. xxxvi., p. 291. 
