PLATE XXXVIII. 



Fig. 1. — Edmondia subplicata. A specimen of a right valve to show contour. 

 The outer coat of the shell has been removed by the waves. From the Calciferous 

 Sandstone series of Randerston, Fife. My Collection. (Page 315.) 



Fig. 2. — Edmondia subplicata. A right valve showing the hinge. Same 

 locality and Collection. (Page 315.) 



Fig. 3. — Edmondia subplicata. A testiferous example. Same locality and 

 Collection. (Page 315.) 



Fig. 4. — Edmondia subpJicata. An almost complete right valve. Same 

 locality and Collection. (Page 315.) 



Fig. 5. — Edmondia subpJicata. A left valve, with the outer shell removed. 

 Same locality and Collection. (Page 315.) 



Fig. 6. — Mytilomorpha rhombea. A left valve, from the Carboniferous Lime- 

 stone of Wetton, Staffordshire. Purchased by grant from Royal Society to be 

 placed in the Natural History Museum, South Kensington. . (Page 340.) 



Fig. 7. — Mytilomorpha rhombea. A right valve, from the Carboniferous Lime- 

 stone of Poolvash, Isle of Man. Collected by Mr. Law. (Page 340.) 



Fig. 8. — Mytilomorpha rhombea. The type specimen of Phillips's Gypricardia 

 rhombea. A right valve from the Carboniferous Limestone of Bolland. In the 

 Gilbertson Collection of the Natural History Museum, South Kensington. 

 (Page 340.) 



Fig. 9. — Mytilomorpha rhombea. A right valve from the Carboniferous Lime- 

 stone of Poolvash, Isle of Man. My Collection. (Page 340.) 



Fig. 10. — Mytilomorpha rhombea. The cast of the anterior two-thirds of a left 

 valve. Showing adductor scar and pallial line. Same locality and Collection. 

 (Page 340.) 



Fig. 11. — Mytilomorpha rhombea. The cast of a very fine example of the left 

 valve. In the Collection of Mr. Law. Same locality. (Page 340.) 



Fig. 12. — Mytilomorpha angulata. The cast of a full-grown example, showing 

 the posterior adductor muscle-scar and pallial line. From the Carboniferous Lime- 

 stone of Thorpe Cloud. My Collection. (Page 344.) 



Fig. 13. — Mytilomorpha angulata. A right valve showing the large escutcheon. 

 Same locality and Collection. (Page 344.) 



Fig. 14. — Mytilomorpha angulata. A right valve with portion of the test. 

 Same locality and Collection. (Page 344.) 



Fig. 15. — Mytilomorpha angulata. A right testiferous example, a little incom- 

 plete in front. Same locality and Collection. (Page 344.) 



Fig. 10. — Mytilomorpha angulata. A right valve showing anterior adductor 

 muscle-scar. Same locality and Collection. (Page 344.) 



Fig. 17. — Mytilomorpha angulata. The cast of the interior of the front part 

 of the right valve, with anterior adductor muscle-scar and pallial line. Same 

 locality and Collection. (Page 344.) 



Fig. 18. — Mytilomorpha angulata. A right valve. Same locality and Collection. 

 Page 344.) 



