On Two of Lindley and Hutton’s Type Specimens. 241 
The type of Sphen. polyphylia, which was collected 
by Mr Lewis, came from the (? Middle) Coal-Measures, 
Titterstone-Clee Hills, Shropshire, and was communicated 
to Lindley and Hutton by Sir Roderick Murchison. 
EXPLANATION OF PLATE. 
Fig. 1. Rhacopteris dubia, L. and H. sp.; from Knowlsbury, Shropshire ; 
natural size. The original specimen figured by Lindley and Hutton. 
Fig. la. Pinule enlarged two times to show nervation. 
Fig. 2. Sphenopteris polyphylla, L. and H.; from Titterstone-Clee Hills, 
Shropshire; natural size. The original specimen figured by Lindley and 
Hutton. 
Figs. 2a, 2b, 2c. Portions magnified two times to show nervation and 
pinnule cutting. 
XV. On a New Species of Bythotrephis from the Lower 
Carboniferous of Lancashire. By Ropert Kipstov, 
F.RS.E., F.G.S. [Plate X., Figs. 1-3.] 
(Read 20th April 1892.) 
In dealing with fossil Algz, great care is necessary, as 
many inorganic markings and tracks of animals assume very 
plant-like forms, and several of these casts have in past time 
been, in error, described as Algee. 
The specimens which I now describe are, however, of un- 
doubted vegetable origin. The fossils are preserved in a 
very friable soft light-grey-coloured shale, composed of very 
thin lamina, which have a great tendency to scale off. The 
fossils themselves are of a rich brown colour, owing to the 
delicate carbonaceous film having been impregnated with 
iron. A small portion of this film was removed, and on 
examination under the microscope was seen to be composed 
of narrow elongated tubular cells. 
Of the eight specimens collected, the two best are shown 
on Plate X., Figs. 1 and 3, and at Fig. 2 is shown a small 
example that occurs on the back of the slab which contains 
that given at Fig. 1. 
Fig. 3 gives the best idea of the general character of the 
