932 DR ROBERT CAMPBELL ON 
Magazine* he concluded that the fish remains from Cowie consisted of: (1) Cephalas- 
pidian scutes belonging to a species as yet unnamed and undescribed ; (2) fragments 
of thin, minutely tuberculated plates, which might also be Cephalaspidian, though 
their nature was problematical; (3) two median plates of a beautiful new Cyathaspis. 
After examination of additional material Dr Traquair t communicated another 
short paper to the British Association meetings at Dundee, in which he gave the 
following brief diagnosis of the new Cyathaspis :— 
““ Cyathaspis Campbell (Traquair).—-Shield, ovoid, concave, shallow, broadest part 
situated behind the point of greatest expanse; covered with stout ridges running in 
a longitudinal direction, but also tending to converge a little anteriorly and posteriorly. 
These ridges are also constantly interrupted, so as to give almost a tubercular appear- 
ance, the tubercles being comparatively distantly placed, much compressed, and 
crenulated.” 
Dictyocaris, unfortunately, must still be labelled ‘“‘incerte sedis.” From its 
resemblance to the living Marchantia it was thought it might possibly be a plant; 
but Dr D. H. Scorr, to whom specimens were sent for determination, replied that 
in his opinion they were not vegetable. Dr Smira Woopwarp thought they were 
unsatisfactory fragments of the dermal armour of Cephalaspidian and Pteraspidian 
fishes, and a larger collection of specimens was made and submitted to Dr Traquair 
along with the undoubted fish remains. Dr Traquair was of opinion that it was 
not likely that the fossil could represent the median layer of the Pteraspidian shield, 
although the resemblance was a suggestive one. There can be no doubt, however, 
that the Cowie specimens are identical with the Dictyocaris of Saurer, which occurs 
in the Upper Silurian of the Southern Uplands and in the Downtonian of England. 
Apart from plant fragments and worm-tracks the remaining fossils in my collection 
belong to the Arthropoda. They include Ceratiocaris sp. (carapace, rostrum, and 
cercopod) ; Archidesmus sp., and a new genus of Myriapod; (?) larval form of insect ; 
Eurypterus, sp. nov.; and fragments of scorpion. The arthropoda will be described 
by Dr Pracu, to whom I am indebted for the above provisional determination. 
As long ago as 1881 Mr Macconocuis collected for the Geological Survey from 
the “Stonehaven Beds” Dzctyocams, fragments of Pterygotus, Hurypterus, and 
(?) Kampecaris, and Dr Horne has told me that in discussing these fossils at that 
time Dr Peacu expressed the opinion that they might be of Silurian age. 
The highest beds in the Downtonian series (No. 7) consist of green and red tuffs 
and brown tuffaceous sandstone with occasional intercalations of pebbly bands and 
thin sandy mudstones. They are exposed in the foreshore at Stonehaven Bay, but 
can be examined only when the tides are low. 
Inland, on account of the drift-covered character of the country, the succession 
cannot, of course, be studied in the same detail. In sections in the Carron Water and 
its tributaries, however, in railway cuttings, and in occasional quarries, evidence has 
* Geol. Mag., dec. 5, vol. viii. p. 66, 1911. + Ibid., vol. ix. p. 511, 1912. 
