PLATE IX. 



Fig". 1. — Limatulina scotica. Portion of a left valve, showing the posterior ear. 

 Muirfoot Burn, New Cumnock, Ayrshire. My Collection. (Page 36.) 



Fig. 2. — Limatulina scotica. The left valve. Same locality. In the Collection 

 of Mr. J. Smith, of Kilwinning. (Page 36.) 



Fig. 3. — Limatulina scotica. The right valve of the last figure, showing the 

 overlapping of the left valve and the flat right valve. Same locality and Collection. 

 (Page 36.) 



Figs. 4, 5. — Limatulina scotica. A fairly perfect specimen, Fig. 4 showing 

 the rig-ht and Fig. 5 the left valve. Same locality. My Collection. (Page 36.) 



Fig. 6. — Pterinopecten concavus. A left valve, the re-described type of 

 M'Coy's species. From Lowick, Northumberland. In the Collection of the 

 Woodwardian Museum, Cambridge. (Page 54.) 



Fig. 7. — Pterinopecten concavus. Portion of a right valve. From the Carboni- 

 ferous Limestone of Lowick, Northumberland. Same Collection. (Page 55.) 



Fig. 8. — Pterinopecten tessellatus. A left valve. From the Carboniferous 

 Limestone of Little Island, co. Cork. In the Collection of Mr. J. Wright. 

 (Page 63.) 



Fig. 9. — Pterinopecten tessellatus. A right valve. Same locality and Collection. 

 (Page 64.) 



Fig. 10. — Pterinopecten tessellatus. A left valve, adult size. Phillips's type, 

 preserved in the Gilbertson Collection, Natural History Museum, South Ken- 

 sington. (Page 64.) 



Fig. 11. — Pterinopecten tessellatus. A left valve, showing the posterior ear. 

 From Little Island, co. Cork. Mr. J. Wright's Collection. (Page 63 ) 



Fig. 12.- Pterinopecten radiatus. A left valve. From the Carboniferous Lime- 

 stone of Thorpe Cloud. My Collection. (Page 55.) 



Fig. 13. — Pterinopecten radiatus. A left valve Avith coarser ribs. From the 

 Carboniferous Limestone of Castleton. My Collection. (Page 56.) 



Fig. II. Pterinopecten radiatus. A full-grown left valve. From Ireland. In 

 the York Museum. (Page 56.) 



Fig. I-'). Pterinopecten radiatus. An almost perfect left valve. From the 

 Carboniferous Limestone of co. Dublin. In the Collection of Mr. J. Wright. 

 ( Page 55.) 



Fig. Hi. Pterinopecten radiatus. Phillips's type, in the Gilbertson Collection, 

 Natural Eistory Museum, South Kensington. (Page 56.) 



