XXXIX] PTEROPHYLLTJM 553 



good impression on shale which shows the generic characters very 

 clearly. 



Pterophyllum Jaegeri Brongniart. 



Brongniarti 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 Httle or no basal contraction; the pinnae may be 

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

 Leuthardt^, 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. Pterofhyllum longifolium^ 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 difierences between these species 

 is, however, very trifling. The imperfectly preserved fossils 

 figured by Leuthardt* 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^ 

 from the Lunz beds in Austria. 



Pterophyllum Bronni Schenk. 



A Keuper species® 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 sKghtly 

 contracted. Arber' 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. 



^ Leuthardt (03) p. 14, PI. v. ^ Ibid. p. 16, PI. v. 



Ibid. PI. vn. fig. 4; PL vin. figs. 3—5. = Kraaser (09). 



' Sohenk (67) PI. ii. There are some fine examples from the Raibl beds in 

 the Vienna Geological Survey Collection. 

 ' Arber (07). 



