﻿1861.] 



KIRK.BY PERMIAN, SOUTH YORKSHIRE. 



309 



most cases oval-shaped and flat ; the coils approximating more 

 or less to a regular arrangement on one plane, as in Sjmillina. 

 Barely disk- shaped, simulating (?) the Spirillina. Occasionally- 

 more globose or cylindrical in form, — the coils overlapping irre- 

 gularly, as generally occurs in Durham examples. The coils are also 

 narrower, and the general habit of the specimens less robust than 

 in Durham examples. 



Usual size: ^-Lth in. long, -gL-th in. greatest width, A^ in. least 

 width; largest specimens, -jLth in. long, ,-L-th in. greatest width, 

 J^-th in. least width. 



In Yorkshire it only occurs at Hampole. It is not rare in the 

 Shell- limestone of Durham, nor in the Unter Zechstein of Germany. 



The surfaces of slabs in the Broth erton Beds are often covered with 

 the remains of an obscure fossil which probably belongs to the Algce. 

 The fragments are filiform, linear or slightly curved, cylindrical or 

 rather compressed, rarely branched, about an inch in length when 

 longest, but generally shorter, and about ^th of an inch or less in 

 breadth. They are often of a brown or reddish tinge — the surface 

 of the slabs being grey or yellowish — and stand out in relief. They 

 show no trace of structure ; and they not only occur on the surface 

 of the slabs, but in the substance of the beds. 



These are often associated with Axinus dubius. At Knottingley 

 the fragments are arranged linearly, with their longer axis in one 

 direction, as if by the influence of a current. Indeed the imperfect 

 condition of the specimens, and the manner in which they are 

 scattered over the surface of the slabs, woidd seem to indicate that 

 they were all more or less subjected to drift-action. 



In the Upper Limestone of Durham — the equivalent of the 

 Brotherton Beds — obscure remains of Algce similar to those under 

 notice likewise occur, and they are also associated with the same 

 shell. These remains are in a carbonized state, and are scarcely so 

 much broken up as those of Yorkshire, but they possess much the 

 same character as the latter, and it is not improbable that they may 

 belong to the same species. 



The obscure fossils resembling Serpula or Dentalium, noticed by 

 Prof. Sedgwick in the Brotherton Beds at Cold Hill, near Aberford*, 

 are probably identical with this fossil. 



Loc. In Brotherton Beds at Knottingley, Pickburn Leys, and 

 Wadworth. 



The occurrence of another fossil, of somewhat obscure affinities, 

 though possibly an Annelid, may here be noticed. 



It is a cast of a laterally compressed tube, 3 inches long (neither end 

 being perfect), -fths of an inch in longest width, and^ths in shorter 

 width. It is slightly arcuate longitudinally, and has an oval, or 

 rather ovate section transversely — the convex edge being more 

 flatly rounded than the other. Between the cast and the investing 

 matrix there is a slight space, which appears to have been originally 

 occupied by the walls of the tube. 



* Trans. Greol. Soc, 2nd ser. vol. iii. p. 118. 



