534 



CYCADOPHYTAN FRONDS 



[CH. 



Heer, and Z. claravallensis* Sap.; similarly Z. Schmiedelii And. 2 

 is probably identical with Z. gigas. The Lower Cretaceous species 

 Zamites bohemicus 9 Vel. and Z. iburgensis* Hos. and von d. Marck 

 represent very similar forms. 



Zamites recta (Tate). 



This species was originally described by Tate 5 as Palaeozamia 

 (Otozamites) recta from Wealden strata in South Africa and sub- 

 sequently transferred to Zamites* ; it bears a very close resem- 

 blance to Z. gigas. The fronds bear alternate linear pinnae 

 attached to the upper face of the rachis by a 

 slightly contracted and swollen base. The lamina 

 has an acuminate asymmetrical apex and the 

 upper edge is slightly falcate ; the larger pinnae 

 are over 6 cm. long and nearly 1 cm. broad ; 

 the veins are frequently forked as they converge 

 towards the base of the lamina. No clear 

 evidence of association of these fronds in the 

 Uitenhage series of South Africa with William- 

 sonia flowers has been discovered, but a specimen 7 

 in the Tate collection in the British Museum 

 may be a badly preserved cluster of bracts 

 belonging to a Williamsonia. The rachis of this 

 species shows some peculiar features in the form 

 of two rows of alternate cushions in some partially 

 decayed specimens. One of these is shown in 

 fig. 600; the cushions are raised oval projections 

 with a flat top, and pieces of the rachis without FlG - 60 - 



. , , MI j i r /~i 'f recta. (Uitenhage 



pinnae might easily be mistaken lor a Coniferous serieg g Africa \ 

 stem. 



Zamites Carruthersi Seward. 



A species founded on specimens from the Wealden of Sussex 8 

 and recorded from Kimmeridge beds in Scotland 9 , characterised 



Saporta (75) A. PL xcm. 2 Andrae (53) A. PL ix. 



Fric and Bayer (01) B. fig. 43, p. 92. 



Hosius and von der March (80) B. PL XLIV. fig. 202. 



Tate (67) PL v. fig. 7. 



Seward (03) B. p. 21, Pis. m. v. 7 No. 11117. 



Seward (95) A. p. 86, PL vi. 9 Ibid. (II 2 ) p. 694, PL x. fig. 43. 



