90 Arber . — A Revision of the Seed Impressions of the 
emarginata , Berg. (Text-fig. 5), N. Meachemi , Kidst. (PI. VI, Figs. 16, 17), 
and N. subacuta , Grand’ Eury (Text-fig. 6). 
Samarospermum , gen. nova. 
I propose here to restrict the genus Samar op sis to those seeds in which 
the wing is of nearly equal length and breadth. There is, however, another 
type, confined until quite recently to the Stephanian and Permian of 
Europe, and represented by but a few species. This was originally referred 
by Helmhacker 1 to Fiedler’s 2 genus Jordania , as J. moravica , Helmh., 
which was first figured by Geinitz. 3 It has, however, been pointed out that 
this fossil does not agree generically with the species of Jordania figured by 
Fiedler, and thus Zeiller, Renault, and others have more recently referred it to 
the genus Samaropsis. Zeiller 4 has refigured Helmhacker’s type specimens. 
It appears, however, to me to be a perfectly distinct type, worthy of generic 
distinction, and, since the genus Jordania , Fiedler, is unsuitable for its recep- 
tion, I here propose the new generic name Samarospermum. This species 
Samarospermum moravicum (Helmh.) (PI. VI, Figs. 19, 20) has recently been 
found in the Middle Coal Measures of the Kent coalfield. The chief 
peculiarity of this genus is the great elongation of the seed, which is very 
narrow in proportion to its length, and possesses only a small nucule. 
The specimens figured by Weiss 6 in 1879, under the name Jordania 
moravica , appear to be specifically distinct from the plant first figured by 
Geinitz. 
Microspermum , gen. nova. 
So far as I am aware, no seed impression has as yet been described 
from Britain which appears to be only symmetrical in one plane. As far as 
one can judge, without any knowledge of the anatomy, all the British 
Platysperms, hitherto described, appear to be symmetrical in two planes. 
We now come to a small seed, if indeed it be a seed, which has several 
curious features, and which like Rhabdocarpus Lillieanus , sp. nova (see p. 88), 
is only symmetrical in a single plane. I have only seen this seed from the 
Middle Coal Measures of the Nottinghamshire coalfield, and I am indebted 
to my friend Dr. Moysey for the loan of a fine suite of specimens of it. It 
is here placed in a new genus Microspermum , as it is quite distinct from any 
other type of seed known to me. 
The seed in question is a small, ovate, or pyriform body from 5-10 mm. 
long, one extremity being rounded, the other contracted acutely. One side 
is keeled, the other grooved, and a large foramen occurs near the broader 
end and on the grooved surface. 
The British specimens figured on PI. VII, Figs. 22-27 agree fairly well with 
1 Helmhacker (71), p. 81. 2 Fiedler (’57), p. 288. 
3 Geinitz, E. (75), p. 11, PI. I, Figs. 10, n. 4 Zeiller (’92), p. 95, PI. XV, Figs. 9, 10. 
5 Weiss (79), p. 36, PI. Ill, Figs. 17-19. 
