266 Messrs. Hicks and Davies— 
Fie. 80. Serpula indistincta, Fleming, sp. The original specimen figured by 
Sowerby. Nat. size. W. Lothian. 
», 81. The same. (8. subcincta, Portlock.) Nat.size. Armagh limestone, Ireland. 
», 932. Another example of the same. : 
», 933. Serpula Torbanensis, R. Eth. Jun. One of the oyal clusters of tubes. x 3. 
5, 984. Serpula vermetiformis, R. Eth. Jun. A specimen showing the peculiar 
constricted tube of this species. Nat. size. Carboniferous limestone. 
5, 85. Vermilia, sp.ind. Ona portion of a small Encrinite stem. x 2. L. Car- 
boniferous limestone group, Skateraw Quarry, near Dunbar. 
», 86. Another stem bearing two small specimens of the same. x 2. Same 
locality, ete. 
», 87. Ortonia Carbonaria, J. Young. An example in which the transverse 
ridges and vertical striz are preserved. x 6. Ravyenscraig Castle, near 
Kirkcaldy, Upper Carboniferous limestone group. 
», 938. A large specimen of the same. x 6. Skateraw, near Dunbar, L. Car- 
boniferous limestone group. 
», 89. A third individual, showing the small spine to which it is attached, and the 
groove formed by it. x 6. Whitehouse, near Linlithgow, Upper 
Carboniferous limestone group. 
», 40. Another example, with the groove from which the spine has been removed. 
x 6. Galabraes Quarry, near Bathgate, L. Carboniferous limestone group. 
», 41. Ditrupa Ryckholti, R. Eth. Jun. Two minute examples, many times 
magnified. Carboniferous limestone, Woodend Quarry, near Fordel, Fife. 
5, 42. Ditrupa, sp. ind. Recent specimens from Madeira, for comparison with 
Fig. 41. Nat. size. 
The subjects of Figs. 30 and 42 are in the British Museum; Figs. 6, 13, 14, 29, 
31, and 32 are in the Mus. Practical Geology; Fig. 34 is in the Cabinet of the 
Rev. Mr. De-la-Haye; and the remainder are in the Collection of the Geol. 
Survey of Scotland. 
(Lo be continued in our next Number.) 
IV.—On tHe Pre-Camprian Rocks oF Waist AND CENTRAL 
Ross-SHIRE. 
By Henry Hicks, M.D., F.G.8. 
WitnH Perrrorocicat NOTES. 
By T. Davizs, F.G.S., of the British Museum. 
(Concluded from p. 226.) 
Part IY. 
Ben Fin and Mulart. 
fey these mountains to the north of the road leading from Glen 
Docherty to Auchnasheen, the gneiss rocks and mica schists of 
which they are mainly composed dip at a high angle, and have a strike 
averaging somewhere about N.W. to S.H.—in some places being 
nearly due N. and §., in others only a little N. of W. This strike, 
which is the normal one for the Pre-Cambrian rocks, and very 
unusual in the newer deposits, occurring here throughout so great a 
thickness of strata and over a wide area, when we take into con- 
sideration the fact also that the rocks themselves present the 
strongest resemblance possible to many of those found amongst the 
Pre-Cambrian rocks in the Western areas, furnishes very strong 
proof that we have here a re-appearance of the old Pre-Cambrian floor. 
The range, of which these mountains form a part only, extends 
along central Ross-shire in a line nearly due EH. and W. for a 
distance of about ten miles. It includes Ben Eigen, and a portion 
to the east of that mountain. These I was not able to visit, but 
from the descriptions that have already been given of them, I have 
