Li] PODOZAMITES 455 



lanceolate leaves up to 7 cm. long and 7 mm. broad; the lamina 

 has a tapered acuminate apex and a less gradually though not 

 abruptly contracted base. The leaves differ from the leaflets of 

 Zamia which they superficially resemble in their less abruptly 

 contracted proximal end. In habit a shoot of P. lanceolatus 

 (fig. 811) very closely resembles the fronds of Zamia media. Some 

 of the leaves in the type-specimen appear to be laterally attached, 

 while others appear to be given off from the upper surface. The 

 leaves of this as of other species are frequently found detached. 

 The variability in the form of the leaves has led to the employment 

 of several varietal names, and if not used too freely the addition 

 of some descriptive term to the specific name may often serve a 

 useful purpose. Fig. 811 represents a good example of the species 

 from the Yorkshire coast. The method of attachment of .the 

 leaves is not always clear, but their irregular distribution and the 

 slender axis are features more in accordance with a foliage-shoot 

 than a pinnate frond. Podozamites lanceolatus is a widely dis- 

 tributed Jurassic species 1 recorded from many European localities 

 extending to North Siberia and Spitzbergen as well as from North 

 America, Turkestan, Afghanistan, Japan, China, and elsewhere. 

 The specimens figured by Feistmantel from Upper Gondwana 

 rocks in India as P. lanceolatus (fig. 813) should, I am inclined to 

 think, be assigned to Phoenicopsis. 



Podozamites Reinii Geyler; Podozamites stonesfieldensis Seward; 



Podozamites Griesbachi Seward. 



These species from Jurassic strata serve as examples of a broader 

 type of the genus represented in the last two species by detached 

 leaves only. In these as in many other cases one cannot feel 

 absolute confidence as to the correctness of the determination. In 

 some of the Japanese examples of P. Reinii 2 (fig. 814) the broadly 

 oval leaves are attached to a slender axis. P. stonesfieldensis 3 

 from the Great Oolite of Stonesfield is probably identical with the 

 leaves originally described by Buckman as Naiadea ovata and Lilia 

 lanceolata: the leaves are oblong-ovate, approximately 8 x 3-5 cm. ; 

 the lamina is rather abruptly contracted at the base and more 



1 For references see Seward (00) B. p. 242; (07 2 ); (11). 



2 Geyler (77) B. Pis. xxxm., xxxiv. 



3 Seward (04) B. p. 121, PL m. fig. 4; PL xi. figs. 1, 2. 



