XXXIX] PTEROPHYLLTJM 553 



good impression on shale which shows the generic characters very 

 clearly. 



Pterophyllum Jaegeri Brongniart. 



Brongniart 1 founded this species (fig. 610) on material from 

 the Keuper of Stuttgart. The fronds are characterised by the 

 relatively narrow parallel-sided pinnae with rounded or truncate 

 apices and little or no basal contraction; the pinnae may be 

 contiguous or separate. There are 14 16 veins in each pinna. 

 Leuthardt 2 , who figures several examples of this species from 

 Keuper strata at Basel, speaks of the breadth-index of the pinnae 

 as 12, a term employed to denote the relation of the breadth to 

 the length of a segment. Pterophyllum longifolium 3 is a very 

 similar Keuper type : in this species the pinnae are rather shorter 

 and broader than in P. Jaegeri and contracted at the base; the 

 apex is truncate or obtuse. The differences between these species 

 is, however, very trifling. The imperfectly preserved fossils 

 figured by Leuthardt 4 as the inflorescences of Pterophyllum have 

 not been found in connexion with fronds and their nature is 

 problematical. This and other species are recorded by Krasser 5 

 from the Lunz beds in Austria. 



Pterophyllum Bronni Schenk. 



A Keuper species 6 from Raibl in Carinthia distinguished by 

 its large pinnae, 15 cm. or more in length and 0-5 cm. broad, 

 and by their almost digitate disposition on the rachis. The 

 fronds appear to be relatively short : the upper pinnae are highly 

 inclined while the lower are given off at an obtuse angle; they 

 are obcuneate or more or less oblanceolate, with a truncate 

 asymmetrical apex and rounded angles; the base is slightly 

 contracted. Arber 7 has figured some specimens from the Munich 

 Museum in one of which there are five spreading pinnae and a 

 portion of the rachis ; one pinna is undoubtedly attached and 

 the others, though probably in place, are not in actual connexion 



1 Brongniart (28) p. 95. 



2 Leuthardt (03) p. 14, PL v. 3 Ibid. p. 16, PL v. 

 4 Ibid. PL vn. fig. 4; PL vm. figs. 35. 6 Krasser (09). 



6 Schenk (67) PL n. There are some fine examples from the Raibl beds in 

 the Vienna Geological Survey Collection. 



7 Arber (07). 



