558 PROCEEDINGS OF TFIE GEOLOGICAL SOCIETY. [JunC 13, 



not appear to be more than a single species, though Roylc* has 

 formed a V. radiata from a transverse section of the stem of his 

 V, indica, and INI'Coy f has added another species, V. aiistralis, from 

 N. S. Wales, because there is a slight difference in the radiations of 

 his transverse section from those of Royle's. 



Taking the Vertebraria found at Barkoi as belonging to the only 

 species hitherto discovered either in India or Australia, it is satis- 

 factory to ascertain, that it is just as abundant in all the localities of 

 our sandstone as in the coal-formation of Barkoi. Besides the Ver- 

 tebraria, there is another stem common at Barkoi, which has its 

 exact counterpart nearer Nagpur, It is undescribed, may be distin- 

 guished by its nearly opposite leaf-scars, and occurs plentifully in 

 the laminated sandstone of Silewsif/a. The fruits or seeds from 

 Barkoi I have not at present the means of comparing with those of 

 Kampti. One of them, however, may b^ easily recognized as identical 

 with a fruit or seed lately met with at Bharatwa(fa. 



Between the vegetable remains of the Mahadewas and those of our 

 laminated sandstone, a like comparison might be instituted. If, for 

 example, Mr. Sankey's Pecopteris from that locality agreed, as my 

 memory suggests, with one figured by M'Clelland^, then it must 

 have corresponded with one that occurs at Kampti. The Verte- 

 braria, both at the Mahadewas and near Nagpur, might be proved to 

 be identical, and a general resemblance pointed out in regard to Glos- 

 sopteris, Fhyllotheca, and the fruits or seeds. But after the state- 

 ments of the previous paragraph, it is scarcely necessary to enlarge. 



From the above numerous coincidences, it may be inferred that 

 our laminated sandstone is the equivalent of the carbonaceous and 

 bituminous shales in the north of this territory. It follows, as a 

 matter of course, that the position of the coal-measures is among the 

 beds immediately underneath the ferruginous sandstone (a). 



* ' Illustrations of the Botany, &c. of the Himalayan Mountains.' When I 

 formerly referred (Journ. No. 43. p. 371, &c. and MS. account of the fossil 

 plants) to this reraarkahle genus of plants, I had not in my possession a specimen 

 from the Indian coal-shales. The recent examination of many such has served 

 to increase in my mind the conviction that its character has been misunderstood. 

 Its smaller branches are somewhat slender and apparently vringed. Sometimes 

 they are found lying along the plane of the laminae, — at other times running 

 across it. When a branch is discovered in the former situation, it is found to he split 

 in two halves, with the wings that lie in conformity with the lamination stretched 

 at their full breadth, while those that lie at an angle with it are, as it were, fore- 

 shortened. In this case there is no trace of radiation. But when a branch is found 

 nmning across the laminse, as often happens, all the wings have equal room to re- 

 tain their form, and hence the radiated appearance. The number of the radii or 

 wings differs in specimens which I have examined from the same locality, and, as 

 I believe, in portions of the same plant. A similar want of uniformity in this 

 respect is perceptible in the specimens figured by Royle. That there is any such 

 thing as dichotomous-veined foliage between the radii, does not appear from 

 the shale specimens that have fallen under my notice. On the contrary they 

 seem to be wholly destitute of leaves. But there is every reason to think that 

 our sandstone specimens possess these appendages, and that they are of a narrow 

 linear shape hke those of the Phyllotheca. 



t Ann. and Mag. of Nat. Hist. vol. xx. p. 147. 



% Report of Geological Survey for 1848-49. 



