22 Annals of the South African Museiim. 



quoted of fronds bearing a very close resemblance to Tate's species. 

 A careful comparison of the African and British examples reveals 

 a slight difference in the shape of the pinnae, and this possibly 

 trivial distinction, taken in conjunction with the fact that no 

 reproductive shoots of the Williamsonia type have so far been 

 found in the Uitenhage beds, renders it advisable to use the generic 

 name Zamitcs in preference to Williamsonia and to retain Tate's 

 specific name. It may be that we shall eventually obtain evidence 

 of the existence of the Williamsonia shoots in connection with 

 Zamites recta, but until further evidence is forthcoming it is better 

 to class this species simply as a member of the Cycadophyta than 

 as a representative of a definite family. The reasons on which the 

 British species has been assigned to Williamsonia and placed in the 

 Bennettitales are fully discussed elsewhere." 



Plate III., figs. 1, la (257c, 258c). 



A portion of the specimen is shown in the figure, the whole being 

 14-5 cm. in length. The rachis is partially hidden by the rock 

 and so appears less than its real size ; the longest pinna is 

 approximately 5 cm. long. The veins are clearly shown and, as 

 illustrated in fig. la, they are frequently forked close to their 

 entrance into the lamina — a feature found also in the segments of 

 recent cycadean fronds. 



Plate III., fig. 2 (288c). 



The complete specimen, of which a part only has been drawn, is 

 9 cm. in length ; it illustrates the narrow form and greater obliquity 

 of the pinnae in the apical region of a frond. 



Plate III., fig. 3 (A). 



The single pinna shown in the figure serves as a good example 

 of the very small angle of attachment of segments in the apical 

 region of the frond. 



A portion of the rachis, in the form of a mould, is seen close to 

 the base of the segment. 



Eachis of Zamites recta (Tate). 

 Plate VI., figs. 8-12. 



The nature of the specimens represented in figs. 8-11 was for 

 a long time a puzzle, and I am still in doubt as to their significance. 

 " Sewai-d (00), p. 177; (97). 



