187 
G. W. Lee — Trepostomata. 
Visean ; that is, their age is either D 3 or top of D 2. T. sparsitabulata , which is found 
in the South-West Province as well as in the North British area, is another species the age 
of which is approximately D 1. 
The following table shows the approximate stratigraphical position of the species 
named in this contribution. It will be seen at a glance that the majority belong to the 
top half of the Visean, few being Tournaisian or Lower Visean. Although the materials 
examined may be taken in a broad way to be representative of the actual relative abun¬ 
dance of the Trepostomata in the main sub-divisions of the Lower Carboniferous rocks, 
it is to be hoped that diligent search may yet help to fill the gaps. 
Table showing the Distribution of the British Lower Carboniferous Trepostomata. 
Genera and Species. 
Area of distribution. 
Formation or strati- 
graphical position 
according- to the present 
zonal scheme. 
Stenopora redesdalensis sp. nov. 
| 
Northumberland, Cumberland, South 
Scotland 
D 1. 
„ haddingtonensis sp. nov.... 
Sandersdean, Haddingtonshire 
Top of the Carboni¬ 
ferous Sandstone 
[? D 2]. 
„ dubia {McCoy) . 
Cookstown, Ireland 
Lower Limestone. 
„ castletonensis sp. nov. 
Castleton, Derbyshire. 
D 2. 
„ obliqua sp. nov. 
Arbigland, Kirkcudbrightshire 
D 1. 
„ tenuipora sp. nov. ... 
Avon Section, Bristol. 
Kl. 
Hook Point, Wexford... 
Lower Limestone. 
Tabulipora scotica sp. nov . 
Central Scotland, Northumberland ... 
D 3. 
„ youngi sp. nov . 
Central Scotland 
D 3. 
„ minima sp. nov . 
Central Scotland 
D 3. 
„ ^jowsei ( Nich .) 
Northumberland, Cumberland, South 
Scotland 
D 1. 
Isle of Man 
Poolvash Limestone, 
Bundoran, Ireland . 
Upper Calp Shale. 
„ tenuimuralis sp. nov. 
1 Eelwell, Lowick 
D 2-3. 
Ravenstonedale . 
? 
„ maeandria sp. nov. 
Isle of Man . 
Poolvash Limestone. 
„ sparsitabulata sp. nov. ... 
Northumberland, Cumberland, South 
Scotland, South-west Province 
D 1. 
[? Bundoran, Ireland] 
Upper Calp Shale. 
