PLATE II. 



Fig. 1. — Garbonicola robusta. Transverse form from Limerigg Slamannan 

 Collection of Mr. Smith of Kilwinning, Ayrshire. (Page 45.) 



Fig. 1 a. — Garbonicola robusta. The same shell, showing interior and hinge 

 of the right valve, a. The edentulous anterior portion of the hinge-plate. 

 b. Cardinal tooth somewhat bevelled at the expense of its lower border, c. Con- 

 cavity for cardinal tooth of the left valve, d. Plain toothless surface of the 

 posterior part of the hinge-plate. The unsinuated pallial sinus and posterior 

 adductor scar, are also shown. (Page 45.) 



Fig. 2. — Garbonicola robusta. Small form from Shotts. Same Collection. 

 (Page 45.) 



Fig. 3- — Garbonicola robusta. A more rotund form from Upper Coal-measures, 

 Airdrie. Dr. John Young's Collection. (Page 45.) 



Fig. 4. — Garbonicola robusta. Dalmellington. Dr. Hunter's Braidwood Col- 

 lection. (Page 45.) 



Fig. 5. — Garbonicola robusta. Quadrate form from Dalmellington. Dr. 

 Hunter's Braidwood Collection. (Page 45.) 



Fig. 5 a. — The same, showing cast of the interior and hinge-line. (Page 45.) 



Fig. 6. — Garbonicola robusta. Young form. Mr. Beveridge's Collection. 

 (Page 45.) 



Fig. 7. — Garbonicola rugosa. From Cant Clough, Burnley. Mr. George 

 Wild's Collection. (Page 49.) 



Fig. 8. — Garbonicola rugosa. From Hebden Bridge. Collection of the Geo- 

 logical Survey, Jermyn Street. (Page 49.) 



Fig. 8 a. — The same, showing external ligament and hinge-line. 



Fig. 9. — Garbonicola robusta. Hinge-plate of specimen from the Holly Lane 

 Seam (?), Hanley and Bucknall Colliery, North Staffordshire. My Collection. 

 (Page 45.) 



Figs. 10 and 11. — Garbonicola robusta. From the Shale above Stinking 

 Coal, Froghall. My Collection. (Page 45.) 



