10G PROF. A. C. SEWAED ON WEALDEN FLORAS. [March 1913. 



with fertile shoots referred to SjpJienolepidium kurrianum. 1 Some 

 of the seeds have a median distal process (fig. 10 6), a feature not 

 hitherto noticed. 



Further information as to the structure of this common 

 type is required before it can 'be assigned to its position in 

 the Coniferales : the use of such generic names as Athrotaceojpsis? 

 Taxodium, Glyptostrobus, and Widdringtonites is altogether un- 

 justifiable. 



Planta incertce sedis, a. (PI. XII, figs. 8 & 9.) (Dawson Coll.) 



The incomplete specimens shown in PI. XII, figs. 8 & 9 are 

 clearly of the same type. That represented in fig. 9 consists of a 

 central region, with the remains of a thin torn membrane on each 

 side characterized by numerous, spreading, vein-like impressions. 

 In the lower part of the median region is a prominent convexity, 

 measuring 7x4 mm., possibly caused by a seed ; beyond this the 

 axial region is slightly depressed, and tapers gradually upwards. 



A similar seed-like prominence is seen in fig. 8, and the thin 

 membrane appears to be attached along two obliquely-ascending 

 lines, meeting in the apical region. 



An obvious comparison is with the cone-scales of Araucarites, of 

 the type represented by recent species in the section Eutacta, but 

 this resemblance may well be misleading. It is possible that these 

 two fossils are the basal portions of petioles provided with stipular 

 or winged appendages ; but more complete specimens are needed to 

 establish the nature of these problematical organisms. 



Planta incertce sedis, /S. (PI. XII, fig. 11.) (Dawson Coll.) 



This specimen consists of an approximately circular funnel- like 

 body, 7 mm. in diameter, partly covered with a thick film of coal. 

 The sides of the depression are longitudinally striated. The reverse 

 (fig. 11) shows the striatums radiating from the apex of the conical 

 elevation. 



It is impossible to speak with confidence as to the nature of this 

 fossil: it differs in form from Equisetaceous diaphragms, but it 

 is similar to, though smaller than, the impressions described by 

 Williamson 3 as the infundibuliform disc of Williamsonia \_Zamia]. 

 A very obscure specimen from the Potomac Group, described as 

 W. (?) gallinacea, 1 may also be compared with the fossil shown in 

 PI. XII, fig. 11. 



III. General Survey of the Wealden Floras. 



The following list includes both the British Wealden plants 

 mentioned in the ' Wealden Elora' and subsequent additions : — 



1 For the most recent synonymy, see Berry (ll 2 ) p. 432. 



2 Fontaine (89) p. 239. 3 Williamson (70) pi. lii, fig. 2. 

 4 Ward (05) pi. crii, fig. 4. 



