248 Mr. EK. A. Newell Arber. New Species of  [Jan. 10, 
and ZL. physoides,* but considerably longer than JL. ovoides.t L. Lomaat, 
is, however, a much broader type of seed. On the whole, the new species 
stands nearest to LZ. physoides in point of size. 
The seeds are undoubtedly of a radially symmetrical type, or radiospermic. 
They are elliptical in shape (Plate 2, figs. 1 to 3), and broadest midway 
between the apex and the chalaza. The apex is a little more pointed than the 
base. There is no reason to doubt that they were borne as sessile bodies on 
an axis. The hilum is seen in a specimen figured on Plate 2, fig. 2. 
The integument is smooth, and in instances where the carbonaceous film 
covering the seeds is preserved, it is characterised by numerous, longitudinally 
arranged, minute dots, having thus a punctate appearance (cf enlarged 
drawings on Plate 2, figs. 1, 2, and 3). Many of the seeds, especially those 
which appear to be less compressed, show several slight longitudinal ridges 
or keels. The number of keels appears to equal the number of apical 
lobes, and they traverse the seed in such a manner as to end at the apex 
of each lobe. These keels are conspicuous in photos. 1, 3, and 4 on 
Plate 1, and are also seen in the enlarged drawing on Plate 2, fig. 3. Some- 
what similar ridges have been described in the seed, Lagenostoma Lomaai.t 
In instances in which the preservation is particularly good, the rectangular 
form of the cell walls of the integument can be seen under a high magnifi- 
cation. The appearance of these cells is shown on Plate 2, fig. 6, where they 
are magnified about 70 diameters. 
The lobed nature of the integument at the apex of the seed at once 
distinguishes LZ. Kidstoni from any other seeds, preserved as casts or impres- 
sions, which have been previously described. In view of Williamson’s$ 
description of the structure of Lagenostoma physoides, there can be no hesita- 
tion in identifying this seed as a member of that genus, although the structure 
in this instance is not preserved. In this conclusion I am confirmed by the 
opinion of Professor Oliver, who has made a special study of the Paleozoic: 
petrified seeds, and who has very kindly examined this material. 
The enlarged drawings of selected seeds reproduced on Plate 2, figs. 1 
and 3, show that the apex is divided into several short, blunt lobes. The 
apical lobes are also clearly seen in several of the photographs on Plate 1, 
* Williamson, “On the Organisation, Part VIII,” ‘Phil. Trans.,’ vol. 167, p. 241, 
Plate 61, figs. 7778, Plate 62, fig. 79, 1877; and Butterworth, “Some further Investi- 
gation of Fossil Seeds of the genus Lagenostoma, etc.,” ‘Mem. and Proc. Manchester Lit. 
and Phil. Soc.,’ vol. 41, Part 3, Mem. IX, Plate 8, 1897. 
+ Williamson, zded., p. 234, Plate 59, figs. 5359, Plate 60, figs. 60—70 and 74—75 
Plate 61, figs. 70, 72—73. 
{ Oliver and Scott, zbzd., p. 198. 
S Williamson, ibidDp, 241, Plate 2, fig. 77; also Butterworth, zbzd. 
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