XXVH] CYCLOPTERIS 571 



localities in North America and the Continent. Zalessky^ has 

 recently recorded the species from the Coal-Measures of Donetz. 

 The frequent occurrence of detached pinnules points to a 

 caducous habit. Even single leaflets can, however, be identified 

 by their large size, the pointed apex, and hairy lamina. The 

 hairs are preserved as fine oblique lines simulating veins ; 

 they were so described by Roemer "■= who took them for cross- 

 connexions between the secondary veins and referred the pin- 

 nules to Gutbier's genus Dictyopteris. 



Another example of Neuropteris with hairy pinnules is 

 described from the Commentry Coal-field by Renault and 

 Zeiller as N. horrida^. The oval-linear, bluntly rounded, 

 pinnules are characterised by a median band of hairs on each 

 surface and a narrower strip at the edge of the lamina. 



Cyclopteris. 



This generic name was created by Brongniart in 1828* for 

 specimens which he believed to be complete single leaves of 

 orbicular or reniform shape similar to those of Trichomanes 

 reni/orme. The lamina is traversed by numerous dichotomously 

 branched veins which spread from the centre of the base. 



It was suspected by Lindley and Hutton' that certain 

 Cyclopteris leaves belonged to the frond of a species of 

 Neuropteris, and some years later Lesquereux ® concluded that 

 Brongniart's genus was founded on orbicular leaflets of Neuro- 

 pteris. In 1869 RoehF figured a specimen of Neuropteris 

 bearing Cyclopteroid pinnules on it,s rachis. It is now univer- 

 sally admitted that Cyclopteris is not a distinct genus and that 

 the specimens so named were borne as modified pinnules on the 

 main rachis of Neuropteris and Odontopteris. It is, however, 

 convenient to retain the name for detached leaflets which 

 cannot be referred to the fronds on which they were borne. A 

 specimen found by Mr Hemingway in the Upper Coal-Measures 



1 Zalessky (07) PI. xxiv. fig. 5. '■' Zeiller (88) A. p. 251. 



3 Benault and Zeiller (88) A. p. 251, PI. xxxii. * Brongniart (28) A. p. 51. 



5 Lindley and Hutton (33) A. p. 28. 



8 Lesquereux (66) A. ' Koehl (69), 



