

PLATE I. 



Fig. 1. — Carbonicola robusta. From Lower Yard Seam, Fulledge, Burnley. 

 In Mr. George Wild's Collection. (Page 45.) 



Fig. 2. — Carbonicola robusta. The original of Prof. Prestwich's figure, ' Geology 

 of Coalbrookdale,' pi. xxxix, fig. 14, from his Collection. (Page 45.) 



Fig. 2 a. — The same specimen viewed from superior border. 



Fig. 3. — Carbonicola robusta. From Dalmellington, Upper Coal-measures. 

 From Dr. Hunter's Braidwood Collection. (Page 45.) 



Fig. 3 a. — The same, showing the external view of hinge and ligament. 

 (Page 45.) 



Fig. 4. — Carbonicola robusta. Dalmellington, Upper Coal-measures. Dr. John 

 Young's Collection. (Page 45.) 



Fig. 5. — Carbonicola robusta. Dalmellington, Upper Coal-measures. Dr. John 

 Young's Collection. (Page 45.) 



Fig. 6. — Carbonicola robusta. Upper Coal-measures, Dalmellington. A less 

 transverse form from Dr. Hunter's Braidwood Collection. (Page 45.) 



Fig. 6 a. — The same, showing the external view of the hinge and ligament. 

 (Page 45.) 



