Roberts — Yorkshire. 163 
I have only attempted to give an outline of the thoughts which 
have so often struck me apie geologizing in the South Welsh Coal- 
field, and which, while adding “ho the interest of the more minute 
details, really form the fr amework on which the details depend. 
VII. GroLtocicat NoTES ON THE MOUNTAIN-LIMESTONE OF 
YORKSHIRE. 
By G. E. Rozrrts, Esq., F.G.S., &e, 
[Plate V.] 
provasry few geologists pass through Yorkshire en route for 
the North without paying a visit to the large and most 
interesting museum illustrative of local, as well as of general, British 
Geology, formed by Mr. Edward Wood, F.G.8., of Richmond. ‘The 
joint papers by Prof. L. de Koninck (of Liége) and Mr. Wood on the 
new and remarkable genus of Crinoids, named by De Koninck 
Woodecrinus, in honour of their enterprising discoverer, which 
appeared in the ‘Geologist’* and other scientific journals, have given 
the genus an important standing among Crinoidea ; but since that 
publication of the material acquired by Mr. Wood he has been so 
fortunate as to add extensively to his fine collection, chiefly 
through the kindness of his friend and neighbour Mr. Brown, J.P., 
who opened quarries on his estate at Holwith for the sole purpose 
of aiding the researches of Mr. Wood; and the wall-cases in the 
museum devoted to these fine Crinoids now present a wonderful 
richness of fossil-wealth. Amongst many other fine specimens 
I would chiefly notice the exceedingly beautiful specimen of 
Woodocrinus expansus, which is not only, beyond doubt, the finest 
ever found, but has a peculiar interest from the fact of its retaining, 
in a purple-coloured suffusion on the tips of some of the rays, which, 
with their attendant fringe of pinnules, terminate the arms, some 
indication of the animal substance which clothed them. This colour 
is probably due to a phosphate of manganese. As this specimen is 
thus doubly interesting, I am much indebted to Mr. Wood for permis- 
sion to have it figured in illustration of my remarks. 
It may be useful to remark that six species of Woodocrinus have 
been determined from Mr. Wood’s collection, together with the 
following genera and species from the same Mountain-limestone 
locality :—Hydreionocrinus Woodianus, De Koninck, described in 
‘Bulletin Acad. Roy. Bruxelles,’ and in the ‘Geologist,’ vol. i. 
p- 146; Cheirocrinus Koninckii; MS. Salter, and C. flagellum, 
MS. Salter ; together with new undescribed species of the genera 
Mispilocrinus, Platycrinus, and Poteriocrinus. 
It is necessary to observe that the figure given in the ‘ Geologist’ 
for January 1858 (vol. i. pl. 2) of Woodocrinus expansus Was a 
restoration from an Sremen eC specimen}which merely gave indica- 
tions of the column, and was very imperfect in its pelvic plates. 
* Vol. 1. p. 12 
M 2 
