XXI] 



DIPTERIDINAE 



387 



Brongniart's specimens has convinced Nathorst of the specific 

 identity of C. meniscoides and C. platyphylla. The Tonkin 

 leaves described by Zeiller^ under the latter name should, 

 therefore, be included in C. meniscoides, which may be thus 

 defined : 



Fio. 285. Clathropterit meniscoides. From Rhaetic rocks near Erlangen. [M.S.] 



The petiolate frond is characterised by an equal dichotomy of the 

 rachis, as in Dictyophyllnm ; each branch bore 5—15 pinnae, disposed 

 en eventail, reaching a length of 20—30 cm. and fused basally as in 

 D. Nathorsti Zeill. Pinnae linear lanceolate, slightly contracted at the 



1 Zeiller (03). 



