4492 Mr. W. N. Edwards on Parkia decipiens. 
those of Williamsonia spectabils and W. pecten, also figured 
by Nathorst (1909, pl. ii. figs. 8-15), are very elongated, and 
may be as much as ‘065 mm. in length. In the case of the 
small flower originally deseribed by Nathorst (1909, p. 20) 
as Walliamsonia (?) ligniert, and subsequently referred by 
Thomas (1915, p. 134) to his new genus Williamsoniella, 
the spores are from *025 to ‘03 mm. in diameter, and usually 
round or elliptical. If, then, the size and shape of the spores 
is a sound guide to affinity, we have here an additional reason 
for referring the present specimen to the genus William- 
soniella, even if the structure of the central axis remains 
uncertain. 
I therefore propose to name it Williamsoniella valdensis, 
sp. n. 
LITERATURE. 
Narnorst, A.G. (1909.)  ‘ Paliobotanische Mitteilungen 8.” K, 
Svenska Vetenskapsak. Handl. Bd. xlv. no. 4. 
——. (1911.) “ Paliobotanische Mitteilungen 9.” K. Svenska Ve- 
tenskapsak. Hand]. Bd. xlvi. no, 4. 
Smwarp, A.C. (1895.) “The Wealden Flora,” pt. ii. Brit. Mus. 
(Nat. Hist.) Cat. Mesozoic Plants. 
Tuomas, H. Hamsuaw. (1915.) “On Williamsoniella, a new Type of 
Bennettitalean Flower.” Phil. Trans, Roy. Soc. [B] vol. cevii. 
pp. 115-148. 
Wiervanp, G. R. (1914.) “La Flora Liasica de la Mixteca Alta.” 
Bol. Inst. Geol. de Mexico, no. 31. [Atlas, 1916. | 
EXPLANATION OF PLATE XII. Fies. 1-3. 
Fig. 1. Williamsoniella valdensis, sp. n., Wealden, Hastings, Sussex. 
Rufford Coll. Brit. Mus. Nat. Hist. Geol. Dept., V. 3175. 
Abont nat. size. Photo P. Dollman. 
Fig. 2. The same, enlarged, showing probable synangia at B. Photo 
P. Dollman. 
Fig. 3. The same. Mass of microspores from near the point A in fig. 2. 
x 380. Phcto F. W. Edwards. 
LII.—WNote on Parka decipiens. 
By W.N. Epwarps. 
(Published by permission of the Trustees of the British Museum.) 
[Plate XII. figs. 4 & 5.] 
A very full account of the morphology and histology of 
Parka decipiens, Fleming, was recently given by A. W..R. 
