hind : carboniferous rocks of isle of zviax 147 
The Limestones of Port St. Mary. 
On p. 196 of the ^Memoir, Mr. Lamplugh shows that the 
basement conglomerate occurs at Port St. Mary, having been found 
below low water. This fact indicates that the limestones are 
those which succeed the basement conglomerate. Mr. Lamplugh, 
p. 205, op. supra cit., estimates that there are 81 ft. of limestone 
exposed at Port St. Mary. He notes that corals are abundant. 
The coral fauna is identical with that of the lower part of the 
Scarlet Limestones, and I obtained at Port St. Mary : — 
Zaphrentis Enniskilleni. 
Caninoid Campophyllum. 
Cyathophyllum sp. 
Lithostrotio7i affine. 
,, Martini. 
Syringopora sp. 
Unfortunately time prevented me from collecting here 
as much as in other sections, but the coral fauna shows 
that the series is the equivalent of part of the Derbyhaven 
sequence. 
Correlation of the Limestones. 
The faunas from all the sections demonstrate that the 
whole of the limestones described by previous authors as tlie 
Lower Limestones belong to one and the same series, which, at 
most, can be only 200 ft. thick. The coral fauna of Scarlet shows 
that the beds belong to the upper part of the Dihunophyllum 
zone of the Bristol area, and pass up without a break, both at 
Scarlet and the black limestone quarry of Poolvash, into the 
Posidonomya Becheri beds of the Pendleside series. Portion 
of the series, the Cyathaxonia beds, represents a slightly higher 
phase than occurs at Bristol, which is found well developed 
in North Wales and in certain localities in North Staffordshire 
and Derbyshire, in the cherty limestone series of Warslow, near 
Waterhouses, and at Bradbourne. 
