XXVIl] 



GLOSSOPTERIS 



503 



what diagrammatically a longitudinal and transverse view of a 

 Vertebraria; the radiating arms represented in the transverse 

 section (fig. A) are the stem ribs or wings and the segments 

 between them are intrusions of sedimentary material. The 

 rectangular areas characteristic of the surface of a Vertebraria 

 are the intruded segments of rock: these are separated at 

 intervals by transverse grooves, which mark the course of 



B 



Fig. 338. A, B. Vertebraria indica. (After Zeiller.) 



C, D. V. indica. (Nat. size. After Oldham.) 



E, F. Ofioclea struthiopteris. ( x 2. After Zeiller.) 



vascular strands given oflfat each anastomosis of the longitudinal 

 wings to supply the leaves. 



Mr Oldham, who discovered the connexion between Glosso- 

 pteris and Vertebraria independently of Dr Zeiller, does not 

 agree with the interpretation of the structural features of the 

 rhizome which Zeiller bases on a comparison between Vertebraria 

 and Onoclea struthiopteris. Oldham^ describes Vertebraria as 



» Oldham (97). 



