PLATE XXXI. 



Fig. 1. — Edmondia Lyellii. A bivalve specimen, from Beith, showing the 

 anterior adductor muscle-scar. In the Collection of Mr. It. Craig, of Beith. 

 (Page 300.) 



Fig. 1 a. — Edmondia Lyellii. A portion of the shell of the same specimen, 

 magnified to show the punctate markings on the surface. 



Fig. 2. — Edmondia Lyellii. A fine testiferous example of the left valve. From 

 the Carboniferous Limestone of Galway. In the Collection of the Geological 

 Survey of Ireland. (Page 300.) 



Fig. 2 a. — Edmondia Lyellii. The same specimen viewed from in front. 



Fig. 3. — Edmondia Lyellii. A cast of the left valve, showing both adductor 

 muscle-scars and the pallia! line. From Beith. In the Collection of Mr. J. 

 Young, LL.D. (Page 300.) 



Figs. 3 a, b. — Edmondia Lyellii. Two views, to show the groove for the 

 lamellar process of the hinge-plate. 



Fig. 4. — Edmondia Lyellii. A perfect specimen of the right valve. From 

 Beith. In the Collection of the Geological Society of Glasgow. (Page 300.) 



Fig. 4 a. — Edmondia Lyellii. The same specimen, showing the edentulous 

 hinge and groove for the external ligament. 



Fig. 5. — Edmondia Lyellii. A very fine example of both valves from Craighall, 

 Fife. In the Museum of Science and. Art, Edinburgh. (Page 300.) 



