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PROCEEDINGS OE 1'IIE GEOLOGICAL SOCIETY. 



[Mar. 20, 



Zigno), must evidently, from the descriptions, be of an entirely 

 different structure. 



13. Knorria? (Conifer?) PI. XII. fig. 1, 

 A single fragment, in a fine-grained red sandstone from Mangali. 

 This is a cast of a piece of stem or branch, about g inch broad, di- 

 stinctly marked with numerous small, roundish, dot-like leaf-scars, 

 arranged with great regularity in a quincuncial or spiral order ; each 

 scar distant rather more than 1 inch from those nearest to it. No ap- 

 pearance of definite areolse as in Lepklodendron, but a narrow furrow 

 or crack running down from each leaf-scar for some distance in a 

 straight line. The form and size of the scars clearly indicate that 

 the leaves were slender and needle-shaped. 



This fragment is perhaps technically referable to Knorria, and 

 may have belonged to a Lycopodiaceous plant ; bat its appearance is 

 so strikingly like that of a small branch of a Spruce-fir stripped of 

 its leaves, that, in the absence of any positive evidence to the con- 

 trary, I am strongly inclined to believe it to be Coniferous. 



14. Rhizojie of a Fern ? PI. XII. fig. 2. 

 A specimen from Mangali, referred (doubtfully) by Mr. Hislop to 

 Lcjndodendron ; in a very unsatisfactory state of preservation, but 

 interesting as having more the look of a genuine Coal-measure fossil 

 than any other in the collection. Appears to be a small portion of 

 the surface of a flattened stem, with numerous scars (qu. leaf- 

 scars ?) arranged in somewhat of a spiral or quincuncial order, but 

 with a good deal of irregularity ; the scars ill-preserved, but seem- 

 ingly forming small pits or depressions (as in Stigmaria) of a circular 

 or transversely elliptical form, with a small central boss or protube- 

 rance ; the surface between these pits marked with various wavy 

 transverse wrinkles, which partly enclose the scars, but do not form 

 definite areola) as in Lepidodmdron. The appearance is a good deal 

 like some varieties of the so-called St'ujmarke, under which name are 

 doubtless included the roots of Lcpidodendra as well as of Sigilla - 

 rice. The scars are not, however, arranged with the symmetry 

 characteristic of Stigmaria. Nevertheless, if well-marked Lcpido- 

 dendra or Slgillarice had been found in the same beds, I should have 

 considered it, with little doubt, as a fragment of a root belonging to 

 one of those families. But as I find nothing else among the Na'g- 

 pur fossils to support such a notion, I am more inclined to conjec- 

 ture that it may have been a fragment of the rhizome of a Fern. 



15. Stem. 



Apparently an impression of a large flattened stem, with some- 

 thing of the appearance of a Sigillaria ; but the ribs and furrows 

 arc very irregular, perhaps casual, and of the scars only a few 

 remain ; these are veiy small, indeterminate in form and character, 

 showing a tendency to an arrangement in vertical rows, but not very 

 distinctly. The specimen is from SilewacZa. 



1G. Stem. PI. XII. fig. 3. 

 This specimen is from SilewaeZa, and appears to be an impression 



