Notices of Memoirs — Papers read before Section C. 511 



II. — A Theoky of the Menai Strait. 1 By Edward Greenly, F.G.S. 



13 AMSAY'S view of the Strait as a glacial furrow was in the main 

 .Vj accepted ; but it was shown, from the general glacial phenomena 

 and from soundings, that the middle reach of the Strait cannot be 

 explained in that way. Evidence was adduced to show that this reach 

 was excavated by glacial waters during the recession of the ice at 

 a time when the mutual relations of the ice of the mountain-land and 

 of the sea-basin admitted of the accumulation of a temporary lake. 

 Post-Glacial erosion and subsequent changes of level have completed 

 the bed of the Strait as it now exists. 



III. — Note on the Fish-remains collected by Messrs. E. Campbell, 

 W. T. Gordon, and B. N. Peach in Paleozoic Strata at Cowie, 

 Stonehaven. I By K. H. Traquair, M.D., LL.D., F.E.S. 



THE fish-remains from Cowie, Stonehaven, consist of : — 

 1. Small scutes which are about three times as long as they are 

 broad, slightly convex on one side and correspondingly concave on the 

 other, and apparently pointed at both ends. They seem to me to be 

 referable to the category of Cephalaspidian scutes, only the external 

 ornament, where visible, consists of longitudinal and slightly wavy striaj 

 in place of tubercles. That the species to which they belong, as yet 

 unnamed and undescribed, is pretty certain ; but the advent of 

 additional material is necessary before proceeding further in that 

 direction. 



2. Several fragments of thin minutely tuberculated plates, which may 

 also be Cephalaspidian, though their nature, indeed, is still problematical. 



3. Several specimens of a beautiful Cyathaspis, which I herewith 

 dedicate to Dr. R. Campbell, and of which I give a brief diagnosis. 



Cyathaspis Campbelli (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 posterioxdy. These ridges are also 

 constantly interrupted, so as to give almost a tubercular appearance, 

 the tubercles being comparatively distantly placed, much compressed, and 

 crenulated. 



IV. — The Downtonian and Old Bed Sandstone of Kincardineshiee. 



By Egbert Campbell, M.A., D.Sc. 



I. — Downtonian. 



A THICKNESS of nearly 3,000 feet of vertical or highly inclined 

 strata, formerly included with the Lower Old Red Sandstone, but 

 now regarded as of Downtonian age, intervenes between Craigeven Bay 

 and Stonehaven Harbour. Three groups of beds in this succession may 

 be particularly noted : — 



1. At the base of the series there is a thickness of about 200 feet 

 of breccias interbedded with fine red mudstones and made up mainly 

 of fragments of the underlying (?) Upper Cambrian rocks. The base- 

 ment breccias rest unconformably on the (?) Cambrian. The uncon- 

 formable junction, which is well seen on the north side of the headland 

 at E.utherj'- Head, was formerly regarded as a line of faulting. 



2. About 20 yards east of Cowie Harbour there occurs a thick belt 

 of grey and greenish mudstones and shales which yield Bictyocaris in 

 abundance. From this horizon have been obtained also . C eratiocaris \ 

 Archidesmus sp., and a new genus of Myriopod ; (?) larval form 

 of insect ; Eurypterus, sp. nov. ; fragments of scorpion ; plant frag- 

 ments and worm-tracks. Further, a thin bed of reddish sandy mudstone 

 underlying the above series has yielded numerous plates of a new 

 Cyathaspis. 



-' Abstract of paper read before the British Association, Section C (Geology), 

 Dundee, September, 1912. 



