HIND : CARBONIFEROUS ROCKS OF ISLE OF MAN. 143 
with me on the occasion of the excursion of the Yorkshire Geo- 
logical Society, tells me that the new forms noted from Scarlet 
are found in the beds immediately below the Posidonomya 
Becheri beds m the Midlands. 
Mr. Stobbs and I in our paper on the Carboniferous suc- 
cession below the coal measures in Xorth Shropshire, Denbigh- 
shire, and Fhntshire* point out that the coral genus 
Cyathaxonia denotes a sub-zone at the top of the Upper 
Dibunophyllum zone. The facies of the whole fauna is a very 
high one, and the occurrence of Prolecanites compressus indicates 
the passage beds or very base of the Pendleside series. 
The rocks which are exposed on both sides of Castletown 
Harbour are characterised by a very similar fauna to that wliich 
obtains at Scarlet, and evidently belong to the same series. 
The Limestones of Derbyhaven, Ronaldsway, 
AND Langness. 
The striking fact of the Carboniferous succession at Derby- 
haven (Cass ny Hawin) and Langness is that the lowest beds 
of the series rest on the basement conglomerate, and conse- 
quently give a definite, if local, base to the series. This con- 
glomerate contains no contemporary fossils, and lies on the 
upturned edges of the Manx slates (Plate XVII.). On it he the 
well-bedded, gently dipping limestones of Derbyhaven and 
Langness. Mr. Lamplugh estimates the thickness of the lime- 
stones of Derbyhaven and Ronaldsway at 189 ft. Each bed 
appears consecutively on the foreshore, and can be examined 
and searched for fossils, but as there is no quarrpng, doubtless 
the fauna as shown in the following list is much too meagre. 
I carefully collected from each bed from Cass ny Ha^vdn 
to the breakwater at Ronaldsway. The lowest fossihferous 
bed I found was about 20 ft. from the base of the series, and 
it contained : 
Cyathophyllum ci. <f> 
Syringopo7'a distans. 
Lithostrotion Martini. 
Chonetes papillionacea. 
* Geol. Mag. n. s., dec. 5, vol. iii., p. 500. 
