On a New Pteridosperm possessing the Sphenopteris 
Type of Foliage. 
BY 
E. A. NEWELL ARBER, M.A., F.L.S., F.G.S. 
Trinity College , Cambridge ; University Demonstrator in Palaeobotany . 
With Plate VI. 
T HE discovery of the seed of Lyginodendron on the part of Professor 
Oliver and Dr. Scott, 1 followed more recently by that of the male 
fructification ( Crossotheca ) by Mr. Kidston 2 , has rendered our knowledge 
of this fossil scarcely less complete than it would have been had the genus 
still survived at the present day. One or two points, however, remain to 
be determined. Of these perhaps the most important relates to the manner 
in which the seeds were borne. It will be remembered that, when the seed 
Lagenostoma Lomaxi was first attributed to Lyginodendron , no direct 
evidence of continuity could be demonstrated. But in the case of other 
Lagenostomas, subsequently described, 3 there did appear to be strong 
evidence in favour of the view that the seeds, like the male organs, were 
borne on fronds with reduced lamina. 4 The present specimen, though not 
obviously a member of the same genus, tends to confirm this conclusion in 
a somewhat emphatic manner. 
The fossil frond figured here belongs to the series of Coal Measure 
fossils which constitute the Goldenberg collection, preserved in the 
Museum of Fossil Botany of the Swedish Academy of Sciences at Stock- 
holm. I am indebted to my friend Prof. A. G. Nathorst, Keeper of the 
Museum, for facilities for examining this and other collections under his 
care, and I would here express my very sincere thanks to him for generously 
giving me permission to describe this specimen, and for permitting me to 
borrow it for that purpose. 
Goldenberg’s collection, part of which was illustrated in his ‘ Flora 
Saraepontana Fossilis,’ published between [855 and 1862, of which, how- 
ever, only a portion ever appeared, was derived from the Saar-Rhein 
1 Oliver and Scott (’04). 3 Kidston (’06). 3 Arber (’05 1 ). 4 Arber (05 a ). 
[Annals of Botany, Vol. XXII. No. LXXXV. January, 190S.] 
