674 



pei'iplieral loop however lias been fouud once in E. Tubicaiilis 

 Goppeit sp. ') from Lower Carboniferous strala of Silezia, but in 

 many other respects it is very different from the species under 

 discussion. Perhaps E. Bertrandi may turn out lo be really a portion, 

 e.jf. the higiiest portion of the petiole, never before observed, of 

 some species already known, e.g. E. Scoiti or E. shorensi.s. By its 

 aberrant structure however it seemed to me desirable to descrit)e 

 this form. 



LITERATURE. 



P. Bertrani), 1909. P. Bertrand. Etude sur la fronde des Zygopteridées. These, 

 Lille, avec atlas, 1909. 



P. Bertrand, 1911. P. Bertrand. Nouvelles lemaiques sur la fronde des Zygo- 

 pteridées. Bulletin de la societé d'histoire naturelle d'Autun. 

 t. 25, 1911, p. 18—25, '2 pi. 



VV. T. Gordon, 1911. W.T.Gordon. On the Structure and Atfinities otDiplolabis 

 Römeri (Solms). Transactions of the Royal Society of 

 Edinburgh, vol. 47, 1911, p. 711-736; 4 pi. 



EXPLANATION OF THE PLATE. 



Fig. 1 -3. Etapteris Bertrandi Scott. Transverse section of the petiole; N'. 140, 



141, 142 respectively. 

 Fig. 4. Etapteris Bertrandi Scott. Model of the xyieein tissue of the petiolar 



bundle (the sides of the sinus are too sharply accentuated). 

 Fig. 5. Etapteris Scotti Bertrand. Model of the xylem-tissue of the petiolar bundle. 



i) P. Bertrand, p. 206. 

 Gi'onvigen. Botanlail Luboratory. 



