

1905.| Lagenostoma, a Type of Pteridospermous Seed. 247 
A. Lagenostoma Kidston, sp. nova. 
(1) History, Locality, and Horizon of the Specimens. 
Among the collection of Carboniferous plants in the British Museum (Nat. 
Hist.), there is a large triangular slab of shale,* bearing numerous casts and 
impressions of seeds, for which the name, Lagenostoma Kidstoni, is proposed. 
The specimen in question is merely recorded as from the Glasgow Coalfield. 
I am, however, indebted to Mr. Kidston for information as to the locality 
and horizon from which it was obtained. Mr. Kidston was aware of the 
existence of a precisely similar specimen in the Hunterian Museum, Glasgow, 
which he kindly identified, and through the good offices of Professor Graham 
Kerr and Dr. Scott, I obtained the loan of it for purposes of examination. 
The Glasgow specimen, which was presented to that museum in 1867 by 
Mr. John Smith, bears a full record of the horizon and locality. It was 
collected from the Lower Coal Measures, at Swinhill Colliery, Stonehouse, 
Lanark, from the horizon of the Virtue Well Coal. As has been stated, 
it is precisely identical with the specimen in the British Museum, and there 
is no reason to doubt that both specimens were obtained from the same bed, 
especially as Mr. Kidston possesses information confirming this conclusion. 
I have much pleasure in naming this species in honour of my friend, 
Mr. Kidston, to whom I am greatly indebted for the trouble he has taken in 
this matter. I may also here express my thanks to Professor Graham Kerr, 
and to Dr. Smith Woodward, Keeper of the Geological Department of the 
British Museum, for facilities for studying these specimens. 
I regard the specimens at London and Glasgow as co-types. 
(2) Morphology of the Seed. 
On both the slabs of shale preserved in the British Museum, and at 
Glasgow, casts or impressions of Lagenostoma Kidstoni are extremely numerous, 
and they are the only seeds to be observed on these specimens. Slightly 
enlarged photographs of the Glasgow example are reproduced on Plate 1, 
photos. 1, 3, and 4; the remaining photograph on the same plate (photo. 2) 
being taken from the British Museum slab. In the great majority of cases 
the seeds are preserved as casts. 
The seeds measure on an average 6 mm. in length, and, at their greatest 
width, between 25 to 3 mm.'in breadth. They are nearly all of the 
same size. As compared with the three known species of Lagenostoma, 
L. Kidstont is about the same length as fully-mature specimens of L. Lomaxi+ 
* Registered number in the Geological Dept., V 6241. 
' + Oliver and Scott, zbcd., p. 198. 
