120 MR. E. A. NEWELL ARBER ON TRIASSIC SPECIES 
— 
P. Jegeri and P. longifolium from the Keuper rocks :—* Feuilles pinnées, à pinnules 
d'une largeur à peu près égale, s'insérant sur le pétiole par toute la largeur de leur base, 
tronquées au sommet ; nervures fines, égales, simples, peu marquées, toutes parallèles.” 
Schimper * restrieted the genus to leaves with strictly linear leaflets, an emendation 
which has since been generally accepted. The recent definition of Pterophyllum given 
by Prof. Zeiller ¢ may be quoted as an accurate analysis of the chief characters of the 
fossils usually included under this name :— 
* Frondes simplement pinnées; folioles linéaires, plus ou moins longues par rapport 
à leur largeur, tantót tronquées, tantót arrondies, plus rarement effilées en pointe à leur 
sommet, attachées au rachis par toute leur largeur, quelquefois méme non peu élargies 
à leur base ; parcourues par des nervures simples ou dichotomes, parallèles entre elles.” 
It will be seen that the species described here as Pterophyllum Bronni, Schenk, does 
not agree in certain important respects with this definition of the genus. A discussion 
of this question may, however, be reserved until a description of the specimen has been 
given. 
The Species PrEROPHYLLUM BRONNI, Schenk, 1865. 
(Plate 18. fig. 1; Plate 19. fig. 4.) 
1858. Neggerathia vogesiaca (non Schimp. et Moug.), Bronn, Beitr. trias. Fauna & Flora Rail, 
p. 129, pl. 6. figs. 1-4. 
1865. Pterophyllum Bronnii, Schenk, Flora Schwarz. Schiefer, Raibl, p. 18. 
1870. Macropterygium Bronnii, Schimper, Traité Pal. Végét. vol. ii. p. 132. 
Locality —Keuper of Raibl, Carinthia, Austria. 
Diagnosis.—Frond large, pinnate. Rachis stout, from 1-1:5 cm. in breadth, faintly 
striated longitudinally. Pinnee large, entire, spreading; varying slightly in size and 
shape, on an average 15 cm. or more in length, and 5 cm. or more across at their 
greatest width, a little below the apex; cuneate or more or less oblauceolate. Margin 
entire; apex truncated, usually somewhat unsymmetrical; lateral angles rounded. 
Base not markedly contracted. Nerves fine, very numerous, close, parallel, straight, 
terminating at the broad apex, and not bending outwards towards the margin. 
Description of the Specimen. 
The fine specimen in the Munich Museum (figured on Pl. 18. fig. 1, reduced to two- 
thirds natural size) shows a small fragment of the rachis and portions of five pinne, all 
probably belonging to the same frond. The uppermost leaflet is almost complete (Pl. 19. 
fig. 4. It measures 16:2 cm. in length, and 5'3 em. across at its greatest breadth. 
The apex appears to be slightly emarginate; but this is very possibly due to'some 
accident in the preservation, for it does not appear to be the case in the other pinne, 
in all of which the distal extremities are quite intact. At the base, the pinna 55 
imperfect and obscure, and it cannot be ascertained with certainty whether it is still 
* Schimper (1869), vol, ii, p. 133. T Zeiller (1903), p. 174. 
