tLATE LIII. 



l^igs. 1 and 2. — Conocardium decussatum. The cast of a right valve from 

 Potmetal Plantation, Bogie, Kirkcaldy. In the Collection of the Geological 

 Survey, Jermyn Street. (Page 471.) 



Fig. 3. — Conocardium alatmn. A specimen minus the rostrum, from Lesma- 

 hagow. Same Collection. (Page 473.) 



Fig. 4. — Conocardium decussatum. A fine, almost perfect example of a young 

 shell from Law, Dairy. In the Collection of Mr. J. Smith. (Page 471.) 



Fig. 5. — Conocardium alatum. A strongly keeled variety from Settle. In 

 the Woodwardian Museum, Cambridge ; with Fig. 5 a, a view of the same specimen 

 from above. (Page 474.) 



Fig. 6. — Conocardium Hibernicum. The type of M'Coy's Fleurorhynchus 

 nodulosus. From the Calp Series, Dromed, Mohill. In the GrijGBth Collection, 

 Museum of Science and Art, Dublin. (Page 468.) 



Fig. 7. — Conocardium Hibernicum. The type of M'Coy's Pleurorhynchns 

 giganteus, incomplete, and with a portion of the outer surface of the shell want- 

 ing in front. From St. John's Point, Dunkineely. In the Griffith Collection of 

 the Science and Art Museum, Dublin. (Page 4G8.) 



Fig. 8. — Conocardium Eibernicum. A large example viewed directly from 

 before backwards, showing the large shelly expansion. From Nanteenan, co. 

 Limerick. In the Collection of the Geological Survey of Ireland. (Page 468.) 



Fig. 9. — Conocardium Hibernicum. Showing the flattened posterior surface 

 with the rostrum broken oS". From Limerick. In the Collection of the Geolo- 

 gical Survey, Jermyn Street. (Page 468.) 



Fig. 10. — Conocardium Hibernicum. — A speciman from Nanteenan, co. Limerick, 

 viewed from above. In the Collection of the Geological Survey of Ireland. 

 (Page 468.) 



Fig. 11. — Conocardium Hibernicum. The type of the species figured by 

 Sowerby. From Ireland. In the Sowerby Collection, Natural History Museum, 

 South Kensington. (Page 468.) 



