EXPLANATION OF PLATE XY. 
Fig. 1. Stenopora redesdalensis sp. nov. 
Longitudinal, section x 5. From the Redesdale Ironstone Shale.. Original collected 
by Mr. Stanley Smith. [Slide G. W. L. 172.] Page 153. 
Fig. 2. Stenopora redesdalensis sp. nov. 
Tangential section x 10. The same specimen and slide as the preceding. Page 153. 
Fig. 3. Stenopora b adding tonensis sp. nov. 
Tangential section x 15. From the Calciferous Sandstone Series of Sandersdean. 
Haddingtonshire. [Specimen M. 308 £ , slide G. W. L. 198.] Page 156. 
Fig. 4. Stenopora haddingtonensis sp. nov. 
Longitudinal section x 10. The same specimen and slide as the preceding. Page 156. 
Fig. 5. Stenopora obliqua sp. nov. 
Longitudinal section x. 10. From the Calciferous Sandstone Series of Arbigland, 
Kirkcudbrightshire. [Specimen M. 3317 b , slide G. W. L. 167.] Page 159.. 
Fig. 6. Stenopora tenuipora sp. nov. 
Longitudinal section x 10. From the lower portion of the Avon Section, Zone K 1. 
Original in the Collection of Dr. A. Vaughan. [Slide G. W. L. 163.] Page 161. 
Fig. 7. Stenopora tenuipora sp. nov. 
Tangential section x 20. The same specimen as the preceding. [Slide G. W. L. 162.] 
Page 161. 
Fig. 8. Stenopora dubia (M‘Co'y). 
Transverse section x 10, from the holotype. From the Lower Limestone of Cookstown, 
Ireland. Original in the Griffith Collection, Dublin. [Slide G. W. L. 183.] Page 157. 
Fig. 9. Stenopora castletonensis sp. nov. 
Longitudinal section x 10. From the Carboniferous Limestone of Treak Cliff, Castleton, 
Derbyshire. Original collected by Dr. T. F. Sibly. [Slide G. W. L. 200.] Page 158. 
Fig. 10. Stenopora castletonensis sp. nov. 
Tangential section x 20. The same specimen as the preceding. [Slide G. W. L. 199.] 
Page 158. 
Fig. 11. Tabulipora sp. 
Transverse section x 5. From the Lower Limestones of Trearne, Beith, Ayrshire. 
Original in the Young Collection, Kelvingrove Museum, Glasgow. Slide "1 
b L bxw J 
Page 165. 
Fig. 12. Tabulipora scotica sp. nov. 
Transverse section x 10. From the white limestone "underlying the Hurlet Limestone 
at Corrie-Burn, Stirlingshire. [Slide G. W. L. 192.] Page 162. 
Fig. 13. Tabulipora scotica sp. nov. 
Transverse section X 5. From the Lower Limestones of Hillhead Quarry, Beith, Ayrshire- 
Original in the Young Collection, Kelvingrove Museum, Glasgow. [-W1 
Page 162. 
FIGS. 14 and 15. The thin incrusting stage of Tabulipora. 
Longitudinal section x 10, two aspects of the same section. From the Lower Limestones 
of Carlops, Midlothian. [Slide G. W. L. 190.] Page 142. 
