PLATE LI. 



Fig. 1. — Sanguinolaria gihhosa. Sowerby's type. Preserved in the Sowerby 

 Collection of the Natural History Museum, South Kensington. (Page 404.) 



Fig. 2. — Solenopsis parallela. A very young example from the Carbo- 

 niferous Limestone series of Raven's Craig Castle, Kirkcaldy. In the Collection of 

 the Geological Survey of Scotland. 2 a, the same enlarged. (Page 415.) 



Fig. 3. — Solenopsis minor. M'Coy's type specimen. From Drumreagh. In 

 the Griffith Collection, Museum of Science and Art, Dublin. (Page 413.) 



Fig. 4. — Solenopsis minor. A fully grown example from the Knife Scar 

 Limestone, one mile north of Shap. My Collection. (Page 413.) 



Fig. 5. — Soleiiopsis minor. The specimen figured by Porfclock as Solen pelagicus. 

 From Cloger, co. Ty^'O'^®. Preserved in the Collection of the Geological Survey, 

 Jermyn Street. (Page 413.) 



Fig. 6. — Gonocardiiim rostratum. The type specimen of Sowerby's Cardium 

 elongatnm. Preserved in the Sowerby Collection, Natural History Museum, South 

 Kensington; with Fig. 6a, a view of the same specimen from above, and 6 b, a 

 view from below. The specimen is imperfect at both extremities. (Page 453.) 



Fig. 7. — Conocardium, rostratum. A specimen from the Carboniferous 

 Limestoue of Park Hill, possessing the rostrum and a complete anterior end. In 

 the Collection of the Geological Survey, Jermyn Street Museum. (Page 453.) 



Figs. 8, 9. — Gonocardiiim rostratum. Two examples without the rostrum. 

 Prom the Carboniferous Limestone of Settle. In the Woodwardian Museum, 

 Cambridge. (Page 453.) 



Fig. 10. — Gonocardium Hercvleum. A specimen from Tournai, figured to show 

 the position of the external ligament (<«). Bought with a grant from the Royal 

 Society, and to be placed in the Natural History Museum, South Kensington. 

 (Page 452.) 



Fig. 11. — Gonocardium Herculenm. A perfect specimen of the left valve 

 from the same locality ; with Fig. 11 a, the interior of the same specimen, showing 

 (X, the hollow for the external ligament; h, the anterior adductor muscle-scar. My 

 Collection. (Page 452.) 



Fig. 12. — Gonocardium irregulare. A specimen (nat. size) from the Car- 

 boniferous Limestone of Settle. In the Woodwardian Museum, Cambridge ; 

 with Fig. 12 a, an enlarged view. (Page 456.) 



Fig. 13. — Gonocardium irregulare. A somewhat less perfect example ; with 

 Fig. 13 a, an enlarged view. Same locality and Collection. (Page 456.) 



Fig. 14. — Gonocardium inflatum. The type specimen figured by M'Coy. From 

 Carrickboy, co. Longford ; with Fig. 14 a, a view from above. In the Griffith 

 Collection, Museum of Science and Art, Dublin. (Page 458.) 



Figs. 15, 16. — Gonocardium infiatuni,. Two specimens from Dooghybeg, co. 

 Limerick. In the Collection of the Geological Survey of Ireland ; with 15 a, a 

 view of Fig. 15 from above. (Page 458.) 



Fig. 17. — Gonocardium inflatum. A specimen from Ragreagh. In the 

 Collection of the Irish Geological Survey, with the stump of the rostrum 

 preserved. Fig. 17 a, view from above. (Page 458.) 



