PLATE XXI. 



Fig. 1. — Cardiomorpha oblong a. A fine example from the Carboniferous 

 Limestone of Millicent, co. Cork. In the Collection of Mr. J. Wright of Belfast. 

 (Page 259.) 



Fig. 1 a. — Cardiomorpha oblong a. The same specimen viewed from in front. 

 Fig. 1 b. — Cardiomorpha oblong a. The same specimen viewed from above. 

 Fig. 2. — Cardiomorpha oblong a. A full-grown example from the Carbouiferous 

 Limestone. In the Woodwardian Museum, Cambridge. (Page 259.) 



Fig. 3. — Cardiomorpha oblonga. A cast from the Carboniferous Limestone of 

 the Isle of Man. Same Collection. (Page 259.) 



Fig. 4. — Cardiomorpha oblonga. A specimen in the Sowerby Collection of the 

 British Museum (Natural History), South Kensington. From the Carboniferous 

 Limestone. Locality not known. (Page 259.) 



Fig. 5. — Cardiomorpha oblonga. The tj^pe specimen of Phillips's Isocardia 

 oblonga. From Bolland. In the Gilbertson Collection of the British Museum 

 (Nat. Hist.), South Kensington. (Page 259.) 



Fig. 6. — Cardiomorpha oblonga. A left valve with portions of the test pre- 

 served. Locality unknown. British Museum (Nat. Hist.), South Kensington. 

 (Page 259.) 



Fig. 7. — Cardiomorpha limosa. A fall-grown example from Thornliebank. 

 In the Collection of Mr. J. Neilson of Glasgow. (Page 268.) 



Fig. 7 a. — Cardiomorpha limosa. The same specimen viewed from above. 

 (Page 268.) 



Fig. 8. — Cardiomorpha limosa. A specimen showing the hinge-plate and 

 cartilage-groove of a left valve. From the Upper Limestone series, Garngad 

 Road, Glasgow. Same Collection. (Page 268.) 



Fig. 9. — Cardiomorpha limosa. A perfect specimen from the Upper Limestone 

 series under George Square. In the Collection of Mr. J. Neilson. (Page 268.) 



Fig. 10. — Cardiomorpha limosa. A testiferous example. From Bishopbriggs. 

 In the Collection of Mr. J. Neilson. (Page 268.) 



Fig. 10 a. — Cardiomorpha limosa. The same shell viewed from the front, 

 showing the prosogyrous umbones. (Page 268.) 



Fig. 10 b. — Cardiomorpha limosa. The same specimen viewed from above to 

 show the upper surface. (Page 268.) 



Fig. 11. — Cardiomorpha limosa. A slightly crushed example. From the 

 Upper Limestone series of Dernshaw, Stewarton. In the Collection of Mr. J. 

 Smith. (Page 268.) 



