PLATE XXII. 



Fig. 1. — Solenomorpha major. A left valve, from the Pendleside Series, River 

 Hoclder. In the Collection of the Geological Survey, Jermyn Street. (Page 158.) 



Fig. 2. — Solenomorpha major. A young example, right valve. Same locality. 

 My Collection. (Page 158.) 



Fig. 3. — Solenomorpha, minor. A full-grown shell. The specimen is a cast of 

 both valves, of which the left is figured, somewhat incomplete at the posterior end. 

 Showing the anterior adductor muscle scar. Yeat House Quarry, Cumberland. 

 My Collection. (Page 159.) 



Fig. 4. — Gtenodonta Pentonensis. A left valve, from Penton Linns, Liddlesdale. 

 My Collection. (Page 139.) 



Fig. 5. — Gtenodonta Pentonensis. A right valve, same locality and Collection. 

 (Page 139.) 



Fig. 6. — Gtenodonta Pentonensis. Showing the hinge-plate of a left valve, with 

 6 a, an enlarged view. Same locality and Collection. (Page 139.) 



Fig. 7. — Gtenodonta Pentonensis. A left valve, same locality and Collection. 

 (Page 139.) 



Fig. 8.— Palgeoneil<> carbonifera. A left valve, showing Fig. 8a, the hinge 

 plate, and Fig. 8 b, a view from the anterior end, from shales immediately above 

 the Carboniferous Limestone, Hammerton Hall, Slaidburn. In the Collection of 

 the Geological Survey, Jermyn Street. (Page 142.) 



Fig. 9. — Paracyclas du Noyeri. The original of Lncina du Noyeri, Portlock, 

 from Pettigo, co. Donegal. In the Collection of the Geological Survey, Jermyn 

 Street. (Page 163.) 



Figs. 10 and 12. — Modiola Wrightii. Left valves from Little Island, co. Cork, 

 in the Collection of Mr. J. Wright, Belfast. (Page 132.) 



Fig. 11. — Modiola Wrightii. A right valve. Same locality and Collection. 

 (Page 132.) 



Fig. 13. — Modiola radiata. A right valve from Castleton showing radiating 

 lines. My Collection. (Page 131.) 



Fig. 14. — Modiola radiata. A left valve viewed from the anterior end from 

 Park Hill. My Collection. (Page 131.) 



Fig. 15. — Modiola radiata. A right valve. Same locality and Collection. 

 (Page 131.) 



Fig. 16. — Modiola radiata. A left valve, the type of M'Coy's Gyjpricardia 

 oblonga from Araglin Bridge, co. Cork. In the Griffith Collection, Museum of 

 Science and Art, Dublin. (Page 131.) 



