184 WILLIAMSONIA. 



examples of seeds have been discovered in connection with the 

 reproductive organs, but in a transverse section cut through 

 a small flower at the apex of a peduncle (Scarborough Museum) 

 one or two oval depressions were noticed, which may be due to 

 the presence of small seeds. The best examples of Williamsonia 

 flowers are those in the Yates Collection, Paris, and the specimens 

 figured by the late Professor "Williamson, which are now in the 

 possession of Mrs. Crawford Williamson. 



a. FRONDS AND STEM. 



V. 2723. PL V. (and PL VII. Fig. 2). 



This is a good example of a small frond of Williamsonia gigas ; 

 it measures 23 cm. in length, and illustrates the characteristic 

 habit of the leaf and the form and manner of attachment of the 

 pinnae. The rachis is comparatively slender, and bears on its upper 

 surface numerous alternately disposed linear lanceolate pinnae with 

 rounded bases and acuminately pointed tips ; the basal portion 

 of some of the pinna? is slightly hollowed out in the centre and 

 suggests the original presence of a callus. At the apex of the frond 

 the pinnae are narrow and linear, and at the actual tip they are almost 

 parallel to the rachis ; in the lower portion of the frond the pinnae 

 are shorter and broader, and approximately at right angles to the 

 rachis, while in the middle of the frond they are more crowded, 

 longer, and given oif at a different angle. 



This frond should be compared with Saporta's figures of Zamites 

 Feneonis, Brongn., 1 which I regard as specifically identical with 

 Williamsonia gigas, and with Andrae's figures of Zamites Schmiedelii, 

 Stemb. 2 



V. 27220. PL VII. Fig. 4. 



This figure shows the swollen base of a petiole of a frond more 

 than 60 cm. in length, of which the apical portion has not been 

 preserved ; when complete, it must have been about 80 cm. long. 

 The petiole has a length of llcm., and terminates below in 

 a thick, irregularly oval base. 



Yorkshire. Beckles Coll. 



Saporta (75), pis. Ixxxvii.-xci. 

 Andrae (53), pi. ix. 



