PLATE VII. 



Fig. 1. — Eumicrotis Jiemisphaericus. The left valve of a bivalved example. Fig. 

 1 u . The right valve of the same shell with the anterior ear broken away. Fig. 1 b. 

 The same specimen viewed from above, showing that the valves have slipped on 

 each other. From the Carboniferous Limestone of Hill Bolton, Craven. My 

 Collection. (Page 45.) 



Fig. 2. — Eumicrotis hemisphaericus. A left valve, the type of Phillips's Pect&n 

 hemisphsericus. In the Gilbertson Collection, Natural History Museum, South 

 Kensington. (Page 46.) 



Fig. 3. — Eumicrotis hemisphaericus. A left valve. From the Carboniferous 

 Limestone of Park Hill. My Collection. (Page 45.) 



Fig. 4. — Eumicrotis hemisphaericus. A right valve. From the Carboniferous 

 Limestone of Poolvash, Isle of Man. My Collection. (Page 45.) 



Fig. 5. — Eumicrotis TiemispJiasricus. A left valve to show the sulcus in the cast, 

 between the umbo and the anterior ear. From the Carboniferous Limestone of 

 Castleton. My Collection. (Page 45.) 



Fig. 6. — Eumicrotis hemisphaericus. A left valve. Same locality and Collection. 

 (Page 45.) 



Fig. 7. — Pterinopecten papyraceus. A left valve. Roof of the Hard Coal, 

 Halifax. My Collection. (Page 51.) 



Fig. 8. — Pterinopecten papyraceus. Aright valve, uncrushed. From a bullion 

 in the Penclleside series of Horsebridge Clough. My Collection. (Page 51.) 



Fig. 9. — Pterinopecten papyraceus. A right valve, with well-preserved anterior 

 ear. From the roof of the Hard Coal, Halifax. My Collection. (Page 51.) 



Fig. 10. — Pterinopecten papyraceus. An uncrushed left valve. Same locality 

 and Collection. (Page 51.) 



Fig. 11. — Pterinopecten papyraceus. A left valve, flattened by pressure. Above 

 the Hard Coal, Halifax. My Collection. (Page 51.) 



Fig. 12. — Pterinopecten papyraceus. Right and left valves. From shales below 

 the Third Grit, Wadsworth Moor. My Collection. (Page 51.) 



Fig. 13. — Pterinopecten papyraceus. A left valve. From the Lower Coal 

 Measures of Southowram. My Collection. (Page 51.) 



