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,’ pl. 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. 3a.—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. 6a.—The same, showing the external view of the hinge and ligament. 
(Page 45.) 
