FER. Cowper Reed— Fossils from Dufton Shales. 211 
dark bluish quartz, not in the white quartz. They are frequently 
associated with the included fragments of the Clogau Slates; and 
erystals of gold, along with other minerals, may be seen adhering 
to the slaty surface. The occurrence of tetradymite is regarded by 
the miners as a favourable indication for gold. 
It is certain that the wall rock has some effect on the distribution 
of the gold, for so far not a single pocket has been found where the lode 
has entered into the Gamlan Shales. : 
In the grits and greywackes of the Barmouth Series, immediately 
to the north of the lode, many fractures or cross-courses may be seen, 
which run straight towards the lode and intersect it. It is most 
probable, indeed, that these fractures are responsible, in part at any 
rate, for the distribution of the pockets, as they afford an easy channel 
for the passage of mineral solutions containing gold or some precipitant 
of gold. In many cases, the shoots of gold run more or less trans- 
versely across the lode; a system of cross-courses certainly favours 
such a distribution. In 1875 (40, p. 695) it was noticed that the lode 
was very rich behind one of these cross-courses. The possible 
importance of these cross-courses on the distribution of the pockets 
in the mine has not, however, been recognized, as no systematic 
attempt seems to have been made to follow the cross-courses in the 
search for the rich pockets. 
(To be continued in our next Number.) 
III.—Sxrpewick Museum Norns. 
New Fosstts From tHE Durron SHaEs. 
By F. R. Cowrzr Rezp, M.A., F.G.S. 
Part I. 
(PLATE XVI.) 
SMALL collection of fossils was made a few years ago by 
if Mr. V. M. Turnbull from a cutting: on the Alston Road, near 
Melmerby, and the author’ has already described a new species of 
Lichas (L. melmerbiensis) which was included amongst them. Several 
more new species of trilobites and other groups are now described, 
and the complete list of the fauna is as follows ? :— 
TRILOBITA. OsTRACODA. 
Phacops apiculatus, Salt.* Beyrichia (Tetradella) Turnbulli, sp.nov. 
Calymene senaria (Salt., non auctt.). B. (Ctenobolbina?) superciliata, sp. nov. 
C. Caractaci, Salt. B. (Ceratopsis) duftonensis, sp. nov.* 
Trinucleus Nicholsoni, sp. nov.* Turrilepas sp. 
Acidaspis semievoluta, sp. nov. 
Lichas melmerbiensis, Reed.* Mo.tusca. 
Tornquistia Nicholsoni, Reed. Cyrtolites aff. ornatus, Cour. 
Homalonotus bisulcatus, Salt. (?). Bellerophon (Sinuites) sp. 
Homalonotus ct. Edgelli, Salt. B. (Oxydiseus) acutus, Sow. (?). 
Hi. ascriptus, sp. nov. Cyclonema aft. crebristria, McCoy. 
Iilenus Bowmani, Salt. (?). Holopea sp. 
1 Reed, Grou. Mac., 1907, Dec. V, Vol. IV, pp. 396-400, Pl. XVII. 
? For other lists of fossils from the Dufton Shales, see Harkness, Q.J.G.S., 1865, 
vol. xxi, p. 248; Harkness & Nicholson, ibid., 1877, vol. xxxili, pp. 462-3; 
Marr & Nicholson, ibid., 1891, vol. xlvii, pp. 505, 511. 
