

1905.]  Lagenostoma, a Type of Pterrdospermous Seed. 251 
evidence, though not as conclusive as one could wish, for the provisional view 
that the seeds, described here as Lagenostoma Kidstoni, were borne sessile on 
the terminations of the finer branches of a foliar organ of the Sphenopteris 
type, which is probably best interpreted as a frond with reduced lamina.* 
Summary. 
The chief conclusions with regard to the new seed, Lagenostoma Kidstont, 
may be summed up as follows :-— 
The seed is elliptical in shape, averaging 6 mm. in length, and 2°5 to 
“3 mm. at its greatest breadth. It is undoubtedly radiospermic. The 
surface of the testa was smooth, and the seed was slightly ridged longi- 
‘tudinally. 
The integument at the apex is divided into several lobes, probably 
1x in number in most cases. In the condition of the integument at the 
apex, the seed agrees closely with Lagenostoma physoides, Will. The number 
of keels, or longitudinal ridges of the testa, probably equalled the number 
of apical lobes. 
The seeds are naked in these specimens, and in all probability at this 
stage of their development were not enclosed in a “ cupular ” investment. 
It is provisionally suggested that they were borne in a sessile manner 
on the finer terminations of a foliar organ, probably of the nature of a 
compound frond of a Sphenopteris with reduced lamina. 
B. Lagenostoma Sinclairi, Kidston M.S. 
(1) History, Locality, and Horizon of the Specimens. 
For the loan of the specimens of this Zagenostoma, I am indebted to 
Mr. Kidston, who recorded,f and intended to have described them, but he 
has very generously placed them at my disposal for description in relation 
to the other new species already discussed. I may here express my thanks 
to Mr. Kidston for his kindness in this matter. 
The specimens} are of Lower Coal Measure age, and were obtained | 
from Grange Colliery, Kilmarnock, Ayrshire, on the horizon of the Stranger 
* This conclusion was briefly referred to hy Dr. Scott in a lecture delivered in May, 
1908. Vide Scott, “The Origin of Seed-bearing Plants,” ‘Royal Inst.,’ May 15, 1903, 
p. 13. | | 
t Kidston, ‘Some Fossil Plants collected from the Ayrshire Coalfield by Mr. A. 
Sinclair,” ‘ Annals, Kilmarnock Glenfield Ramblers’ Society,’ No. 4, 1901—1904, p. 14. 
{ Registered numbers 3529 —-3531 in Mr. Kidstun’s collection. Iregard these specimens 
as co-types. 
s 2 
