Mitcheldeania Nicholsoni. A new Genus, from the Lower Carboni- 
ferous Shales of the Forest of Dean. By Epwarp WrrTHERED, 
F.G.S., F.C.S., F.R.M.S. 
In the Geological Magazine for December, 1886,* I described 
a fossil under the name of Mitcheldeania Nicholsoni. The 
figure, however, did not do justice to it; and as I have now 
obtained some other specimens of the fossil, I have the kind 
permission of the Hon. Secretary of the Cotteswold Club, Dr 
Pains, to re-figure the organism in the Proceedings now about 
to be issued. 
Mitcheldeania Nicholsoni is abundant in some beds of the 
Carboniferous Limestone Shales in the Forest of Dean between 
Drybrook and Mitcheldean. I have not as yet found it in any 
other locality, but I see no reason why it should not occur 
elsewhere, and probably if looked for will be found. 
In some sections of the Limestone M. Nicholsoni contri- 
butes largely to the structure of the rock, associated with the 
remains of Ostracoda in considerable numbers, a shell allied to 
Murchisonia angulata, and a few Polyzoa. 
On discovering the fossil I sent specimens to Dr Hinpr, 
Mr Joun Youne, of Glasgow, Mr R. Erueriper, Jun., and to 
Professor Nicnoxson, of Aberdeen, all of whom kindly examined 
them, but were unable to recognize the organism as identical 
with any known form. I have, therefore, determined to 
describe and figure it as a new provisional genus, under the 
name of Mitcheldeania, after the locality (Mitcheldean) near 
which I found it. To Professor Nicnonson I am especially 
indebted for assistance in examining the fossil; but he is in no 
way committed to my remarks in reference to it. As a 
slight acknowledgment of Professor NicHonson’s assistance and 
appreciation of his work generally, I propose to name the first 
species of the genus Nicholsoni. In working out the organism 
* Decade 3, Vol. III, p. 535. 
