Fossil Plants from Tanganyika. 389 



may, however, be closely allied to some leaves of similar form 

 described by Mr. Hamshaw Thomas ^ from Jurassic rocks of York- 

 shire, and assigned by him to a new genus, Eretmophyllym. A species 

 of the same genus has also been recorded from Jurassic beds in 

 Afghanistan. In habit and in venation the African specimen agrees 

 with Eretmoplnjllum, but in the absence of further information, 

 such as could be afforded by the characters of the cuticle were the 

 preservation better, precise identification is hardly possible. 



Ullmannia sp. Figs. 2-5. 



Some of the specimens represent shoots bearing overlapping, 

 spirally disposed, linear-ovate leaves, reaching a length of about 

 1 cm., and 3 mm. in breadth. On some detached leaves there is 

 a faint indication of an oval scar (Figs. 4, 5) at the base, where the 

 lamina was attached to the stem. The venation is not preserved. 

 The leaf impressions often show traces of ridges (P'ig. 4), suggesting 

 that the lamina was comparatively thick and possibly quadrangular 

 in section. 



Other specimens, though of the same general type, show a more 

 compact habit ; the leaves are rather shorter and more appressed 

 to the axis. All the shoots referred to Ullmannia closely resemble 

 in habit Ullmannia frumentaria (Schl.) and U. selaginoides (Brongn.), 

 which are common plants in the Zechstein copper slate of Thuringia.^ 

 It is difficult to draw any satisfactory line between vegetative shoots 

 included by authors in the two genera Ullmannia and Voltzia, and 

 our knowledge of the affinities of fossils referred to them is com- 

 paratively meagre. 



? Ullmannia sp. Figs. 6, 7. 



Two of the specimens are characterized by shorter leaves, 

 4 mm. long, inclined at a wider angle to the axis ; they resemble 

 the European species Ullmannia Bronni Goepp., and may be com- 

 pared also with fossils from Tburingia figured by Geinitz and others 

 as Voltzia Lieheana Gein. It should, however, be pointed out that 

 pieces of vegetative shoots such as these may be generically identical 

 with Jurassic species included in the comprehensive genus 

 Pagiophyllum. 



Voltzia sp. Figs. 8, 9. 



Lobed, fan -shaped scales, from 5 to 8 mm. broad at the distal 

 margin, which are in all probability scales from strobili of a species 

 of Voltzia. They are apparently sterile, though seeds may have 

 been originally attached to them as in similar scales recorded from 

 Thuringia. The specimens are of the same type as those figured by 

 Potonie ^ from the Tanganyika territory in association with, 



^ H. H. Thomas, Proc. Cambridge Phil. Soc, vol. xvii, pt. iii, 1913. 



~ H. B. Geinitz, " Nachtrage zur Dyas I." : Mitt. K. Mineralog. Geol. und 

 Praehist. Mus. Dresden, Heft 111. 1880. 



= H. Potonie, Fossile Pfianzen a us Deutsch- und Portugiesisch-Ost-Afrika, 

 1900. 



