10 D. P. PENHALLOW 



another about 11 em., and are for the most part 1 to 2 cm. broad. No superficial structure 

 is apparent. The plant represented by this fossil was evidently not highly vascular, and 

 readily compressible. 



2. Eugose stems represented by a specimen about IG cm. long, 4 mm in diameter, 

 and showing leaves apparently attached, 2 mm. broad. 



3. Fragments of linear leaves {Cordaites auguslifoHa?). These are 1 cm. broad, and 

 show somewhat rounding terminations. Carbonaceous residue is somewhat conspicuous. 



4. Linear leaves or branches. These are usually represented by mere impressions, 

 and measure from 1 to 3 mm. in width, the aA'erage width being 2 mm. They usually 

 show no structure, but in a few cases fine, parallel lines like the nerves of a linear leaf 

 are to be seen. 



5. Oval impressions showing distinct reticulations. Three such impressions have 

 been observed. The most perfect is an oval body 13 X 20 mm. and devoid of Parka discs, 

 but showing a reticulated and somewhat radiating structure, evidently composed of 

 elongated parenchymatous cells. The form of this specimen appears to be quite com- 

 plete. The second impression is that of a body similar in size, form and structural mark- 

 ings, but only one-half is in view. The third is of the same nature, but the structural 

 markings are more obscure. 



6. Discoid impressions of bodies represented by a somewhat carbonaceous residue, 

 but showing no structure. Apparently solid, spore-like spheres flattened by pressure. 

 Three such discs have been observed, one measuring 6 mm. broad, and the other two 5 

 mm. each. 



Y. Various fragments of Parka of different dimensions and various degrees of per- 

 fection. These all show the characteristic discs or hexagonal markings, which are some- 

 times carbonized, so that they may be separated. They are more generally mere impres- 

 sions. For convenience they may be separated, according to variations in size, into groups 

 A, B and 0. 



Group A. — Bodies of usually regular outline, and oval or round, with distinct 

 discoid markings. They measure from 6 to 11 mm. in breadth. These are associated 

 with stems, to which they sometimes appear united. 



Group B. — Oval bodies with Parka markings distinct, and not in any way con- 

 nected with stems. The outline is generally perfect. They measure about 13 X 20 mm. 



Group C. — A large oval body of ferruginous character, with fairly well preserved 

 outline and impressions of Parka discs. It measures 3'5 cm. by 5"3 cm. 



Numerous fragments showing well-defined Parka discs occur, and, from their size, 

 appear to be parts of bodies of the above dimensions. To properly understand the rela- 

 tions of these various bodies a detailed consideration of each is essential. 



The Rugose Stems, 1 and 2. — Of the rugose stems only two fairly perfect specimens 

 have been brought under my notice ; the one relatively large, and the other relatively 

 small. All the other stem specimens are mere fragments which exhibit no special details. 

 The larger stem is completely flattened, and all the organic matter has been replaced by 

 red oxide of iron. One end — the inferior — is distinctly broader than the other — the 

 superior — the diameter of each being 45 cm. and 3 cm. respectively. Three branches, as 



