92 Annals of tJie South African Museum. 



scars become more crowded and the sm'face shows signs of wrink- 

 Hng — no doubt the result of contraction on drying. Lower dowm the 

 scars again become more scattered, and later, b, the more crowded 

 disposition recurs. The enlarged drawing of the region b (lb) shows 

 more clearly the nature of the scars and their arrangement : in many 

 of them the preservation is not sufficiently good to show the vascular 

 bundle pit in the central umbo. Below the region b the surface 

 features become more obscure. 



Plate XI., fig. 4 (B). 



This fragment is of interest as showing the dichotomous branch- 

 ing ; the scars are precisely like those of the larger specimen, but 

 their preservation is less perfect. 



Plate XI., fig. 5 (XX.). 

 An obscurely preserved and wrinkled specimen, similar to xxi. 

 (fig- !)• 



Plate XI., fig. 6 (XX.). 



A larger branched fragment, bearing scars like those of xxi. 

 (fig. 1), bat showing the surface features much less clearly. There 

 are indications here and there of impressions suggesting narrow 

 linear, leaf-like appendages lying on the stem, but the preservation 

 is too poor to enable one to recognise any certain traces of 

 appendages. 



? GINKGO ALES. 



Genus PSYGMOPHYLLUM Schimper. 



This genus was instituted by Schimper in 1870 ■■'■ for leaves of 

 Permian and Upper Carboniferous age previously referred to Noegge- 

 rathia. He defined it as follows : — ■ 



" Folia pinnatisecta, pinnis erecto patentibus, e basi valde angus- 

 tata flabelliformibus, longitudinaliter flabellatim plicatis, plus minus 

 profunde pinnatisectis, vel margine lobatis sen crenatis ; nervis 

 plusies dichotomis, erecto-radiantibus. Vernatio foliorum verti- 

 caliter involuta." 



Psygmophyllum is placed by Schimper among the Cycads, while 

 later authors I have preferred to regard the lobed and wedge-shaped 



* Bchimper (70), p. 192. f Saporta (84), p. 230 ; Zeiller (00), p. 251. 



