WILLIAMSONIA. 187 



39,093. Portions of fronds. On the same piece of rock there is 

 a good impression of a large Equisetites stem, probably E. Beani, in 

 which the leaf -sheaths are clearly preserved. 1 



Runswick Bay. Presented by S. P. Pratt, Esq. 



Other specimens: V. 2115 (fronds associated with fragments 

 of flowers), V. 2887 (pieces of fronds and a peduncle), V. 3508, 

 V. 3511, V. 3928, 38,779, 39,200, 39,295 (cf. Saporta's figures of 

 Zamites claravallensis 2 and Z. Feneonis 3 ']. 



b. FLOWERING AXES AND FLORAL ORGANS. 



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



The figured specimen, which occurs in association with the frond 

 shown in PI. V., consists of a flowering axis or peduncle, 16cm. 

 long, covered with compressed bracts bearing ramenta ; the 

 peduncle has a diameter of about 3 cm. The summit of the axis 

 was originally occupied by a flower or bud, of which the basal 

 portion only has been preserved. One of the best specimens of 

 a branch of this kind I have met with is in the Leeds Museum. 



BecUes Coll. 



46,633. PI. VII. Figs. 1 and 3, and Text-fig. 29. 



Fig. 1 represents part of a peduncle of the same type as that 

 shown in Fig. 2, but preserved in such a manner as to show the 

 individual linear bracts, which are identical in surface-markings 

 and shape with the involucral bracts of a flower. The central or 

 axial part of the peduncle has not been preserved ; the figured 

 portion shows the cavity originally occupied by the axis, surrounded 

 by very clearly preserved scale-leaves which thickly covered its 

 surface. In Fig. 3 one of the scale-leaves (x in Fig. 1 ) is shown on 

 a larger scale : it has the form of a hollow shell with a compressed 

 lozenge-shaped central portion, which was originally occupied by 

 the ground tissue and vascular bundles ; the shell no doubt 

 represents the more resistent sclerenchymatous hypoderm, the 

 surface-striations being the expression of the longitudinal course of 

 the bands of mechanical tissue which occurred below the epidermis. 



1 Vide ante, p. 67. 



2 Saporta (75), pi. xxiii. fii 



3 Ibid. pi. xx. fig. 3. 



