PLATE LII. 



Fig. 1. — Conocardimn fusiforme. The type of M'Coy's species, from the 

 Carboniferous Limestone of Malahide, co. Dublin. In the Griffith Collection, 

 Museum of Science and Art, Dublin ; with Fig. 1 a, the same specimen viewed 

 from above. (Page 466.) 



Fig. 2. — Gonocardium fusiforme. A much-crushed specimen, showing the 

 unribbed outer surface flattened by pressure, and at X the ribs between the 

 inner and outer plates of the shell. Same Collection. (Page AQ)^.) 



Fig. 8. — Gonocardium Hibernicum. The type of Flearorhyncliiis irigonalis figured 

 by Phillips. In the Gilbertson Collection, Natural History Museum, South 

 Kensington. (Page 468.) 



Fig. 4. — Gonocardium Hibernicum, showing the shelly fringe (X), and its 

 relation to the rest of the shell. From Rowerby, co. Limerick. In the Collection 

 of the Geological Survey, Jermyn Street. (Page 468.) 



Fig. 5. — Ghgenocardiola Footii. The type specimen figured by Baily from 

 Coal Measures, Rosscliff, co. Clare. Fig. a, a cast of the left valve ; Fig. b, 

 a cast of the right valve ; Fig. c, a much smaller example. In the Collection of 

 the Geological Survey of Ireland. (Page 475.) 



Fig. 6. — Ghgenocardiola Footii. The cast of the left valve. Same locality 

 and Collection. (Page 475.) 



Fig. 7. — GJisenocardiola Footii. The impression of the exterior of a right 

 valve. Same locahty and Collection. (Page 475.) 



