HUGHES : INGLEBOROUGH. 371 
and that it was only where the recurved part was broken 
away that our fossil could be taken for an Orthis. We sent 
a selection of them to Davidson, who confirmed this view, and 
named the species Strophomena siluriana. When, however, he 
looked into the matter with a view to his monograph on the 
Silurian brachiopoda, he was unable to satisfy himself as to 
McCoy's Orthis Hirnantensis, and merely reproduced his figures 
and description. 
In the above sections, Figs. 9 and 10, the asterisks mark 
what I take to be the base of the Silurian. In the Hirnant 
section. A3 consists of flags with Mononraptus vomer inns and but 
slight difference apparent at their base, except that they are 
of a paler colour. These pass down into a sandy pisolitic lime- 
stone, whicli weatliers into a rusty gingerbread-coloured rock, 
with fossils abundant, and among them the Orthis hirnantensis. 
This granular bed rests upon a strongly-cleaved schistose rock, 
with limestone concretions, among which I found Orthis actonix. 
In the Yorkshire section, A consists of similar flags to those of 
the Hirnant Section, with the same fossils, and at its base there 
are red bands in the pale series, and sometimes a thin dark 
fossiliferous limestone. All these rest on a coarse light-coloured 
crystalline limestone, sometimes with few, sometimes with 
many, included pebbles, but the only fossils are two species of 
coral, Favosites alveolaris and Favosites fibrosa. This, in the 
adjoining district, rests on a dark shale with Strophomena 
siluriana, while Orthis actonice occurs abundantly lower down. 
Now the question is this, should the Hirnant Limestone be 
bracketed with the Bala Beds, and is McCoy's Orthis hirnantensis 
only a badly-preserved Strophomena siluriana ? I think that it 
is not so, but that the relation between the several series is as 
I have indicated above. 
I hope on a future occasion to give a detailed descrip- 
tion of the rest of the Silurian R-ocks seen under Ingleborough, 
and^ to discuss some further palaeontological questions con- 
nected with them. 
