184 -miLIAMSOKTA. 



examples of seeds tave been discovered in connection Tvith the 

 reprodnctiTe organs, but in a transverse section cut thjough 

 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 Tates Collection, Paris, and the specimens 

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

 possession of Mrs. Crawford "Williamson. 



a. FiioNns aot) Stem. 



V. 2723a. PL V. (and PI. ^T:I. Fig. 2). 



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

 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 beeirs on its upper 

 surface numerous alternately disposed linear lanceolate pinnse with 

 rounded bases and acuminately pointed tips ; the basal portion 

 of some of the pinnae is slightly hollowed out in the centre and 

 suggests the original presence of a caUus. 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 off at a different angle. 



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

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

 Williamsonia gigaa, and with Andrae's figures of Zamites Sekmiedelii, 

 Stei-nb.- 



V. 2722«. PI. VII. Pig. 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 11cm., and terminates below in 

 a thick, irregulaiiy oval base. 



Yorkshire. Beckles Coll. 



' Saporta (75), pis. kxxTii.-xci. 

 ' Andrae (53), pi. ix. 



