PLATE XV. 



Fig. 1.— Nuculana attenuata. The specimen figured by Phillips as the type of Nucula claviformis ? In the 



Gilbertsorj Collection, Natural History Museum, South Kensington. (Page 195.) 



Fig. 1 a. — Nuculana attenuata. The type specimen viewed from above. (Page 195.) 



Fig. 2. — Nuculana attenuata. A full-grown example from Orchard. In the Collection of Mr. J. Neilson. 



(Page 195.) 



Fig. 2 a. — Nuculana attenuata. The same specimen viewed from above, showing the escutcheon. (Page 195.) 



Fig. 3. — Nuculana attenuata. A perfect example from the Lower Limestone series of Thornton. My Collection. 



(Page 195.) 



Figs. 4, 6. — Nuculana attenuata. A series from the same locality. Collection of Mr. J. Neilson. (Page 195.) 

 Fig. 5. — Nuculana attenuata. — A portion of the test magnified to show the concentric ribbing. (Page 195.) 

 Fig. 7. — Nuculana attenuata. A perfect example from the Redesdale Ironstone. My Collection. (Page 195.) 

 Fig. 8. — Nuculana attenuata. A cast of the interior, showing muscle-scars. Same locality. My Collection. (Page 195.) 

 Fig. 9. — Nuculana attenuata. A cast showing the posterior adductor muscle-scars particularly well. Dalock 



Quarry, Fife. My Collection. (Page 195.) 



Fig. 10. — Nuculana attenuata. A cast, showing the hollow caused by the internal umbonal ridge, anterior adductor, 



and accessory muscle-scars. From the Redesdale Ironstone. My Collection. (Page 195.) 



Figs. 11, 11 a. — Nuculana attenuata. The right valve, showing the hinge-plate and interior, with an enlarged view. 



From Thornton. Collection of Mr. J. Neilson. (Page 195.) 



Figs. 12 — 14. — Nuculana attenuata. A series to show the condition of the shell in the very young state and 



subsequent stages of growth. Same locality and Collection. (Page 195.) 



Fig. 15. — Nuculana attenuata. — The original of M'Coy's Nucula leiorhynchus. In the Griffith Collection, Museum of 



Science and Art, Dublin. (Page 195.) 



Fig. 16. — Nuculana attenuata. The original of M'Coy's N. longirostris. Same Collection. (Page 195.) 



Fig. 17. — Nuculana Sharmani. From the Upper Limestone series, Garugad Road, Glasgow. In the Collection of 



Mr. J. Neilson. (Page 199.) 



Fig. 18. — Nuculana Sharmani. The same specimen viewed from above, showing the almost obsolete escutcheon. 



(Page 199.) 



Figs. 19 — 22. — Nuculana Sharmani. A series from Woodhall, Water of Leith. In the Collection of the Geological 



Survey, Edinburgh. (Page 199.) 



Fig. 23. — Nuculana stilla. The specimen figured as the type by M'Coy. In the Griffith Collection of the Museum 



of Science and Art, Dublin. (Page 201.) 



Figs. 24, 25. — Nuculana stilla. From Knockhill Quarry, Strathkinuess, near St. Andrews, the locality where the 



specimen, on which R. Etheridge, jun., founded his species of N. Traquairi, was obtained. In the Collection of the 



Geological Survey, Edinburgh. (Page 201.) 



Fig. 26. — Nuculana brevirostris. The left valve of a perfect specimen from the Lower Limestone series of Thorn- 

 ton. In the Collection of Mr. J. Neilson. (Page 203.) 



Fig. 26 a. — Nuculana brevirostris. The same specimen viewed from above. (Page 203.) 



Fig. 26 b. — Nuculana brevirostris. A portion of the surface magnified to show the regular concentric linear 



markings. (Page 203.) 



Fig. 27- — Nuculana brevirostris. A somewhat smaller example. Same locality and Collection. (Page 203.) 



Fig. 28. — Nuculana brevirostris. A left valve, showing the interior muscle-scars, hinge-plate, and ligament socket. 



Same locality and Collection. Fig. 28 a. — The same specimen enlarged. (Page 203.) 



Figs. 29, 30. — Nuculana brevirostris. Two small examples to show the passage from young to adult. From same 



locality and Collection. (Page 203.) 



Fig. 31. — Nucula brevirostris. The young state of the shell. Collected from the Upper Limestone series of Orchard 



by Mr. J. Bennie. Described as N. Youngi by R. Etheridge, jun. My Collection. (Page 203.) 



Fig. 32. — Nucula Ixvirostrum. The type specimen figured by Portlock. From Beuburb. In the Collection of the 



Geological Survey, Jermyn Street. (Page 182.) 



Fig. 33. — Nucula undulata. A cast showing the muscle-scars. From the Redesdale Ironstone. My Collection. 



(Page 181.) 



Figs. 34, 35. — Nucula Ixvirostrum. From the Upper Limestone series of Orchard. In the Collection of Mr. J. 



NeiUon. (Page 182.) 



Fig. 36. — Nucula Izvirostrum. The view of a left valve. Same locality and Collection. (Page 182.) 



Fig. 36 a. — Nucula Ixvirostrum. The same specimen viewed from above. (Page 182.) 



Fig. 37.— Nucula Ixvirostrum. A smaller example. Same locality and Collection. (Page 182.) 



Fig. 38. — Nucula Ixvirostrum. A specimen from the shale below the Linn Limestone, Linn Spout, Dairy. My 



Collection. (Page 182.) 



Fig. 38 a. — Nucula Ixvirostrum. The hinge of the same specimen. (Page 182.) 



Fig. 39. — Nuculana Ixvistriata. From Thornliebank. A full-grown example. Collection of Mr. J. Smith. (Page 205.) 



FiL r . 40. — Nuculana Ixvistriata. Showing the right valve. Same Collection. (Page 205.) 



Fig. 40 a. — Nuculana Ixvistriata. An enlarged view. (Page 205.) 



Fig. 40 b. — Nuculana Ixvistriata. The same specimen viewed from above. (Page 205.) 



Fig. 10 c. — Nuculana Ixvistriata. An enlarged view of the hinge-line and umbones. (Page 205.) 



Figs. 41 — 43. — Nuculana Ixvistriata. A series from the Lower Limestone series of Brockley. In the Collection of 



Mr. J. Neilson. (Page 205.) 



Fig. 44. — Nuculana stilla. A right valve. From the shales below the Millstone-grits, Pule Hill tunnel, Marsden. 



Collection of Mr. Holroyd. (Page 201.) 



Fig. 45. — Nuculana stilla. A left valve. Same locality and Collection. (Page 201.) 



Fig. 46. — Nuculana stilla. A perfect specimen. Same locality and Collection. (Page 201.) 



Fig. 46 a. — Nuculana stilla. The same specimen viewed from above. (Page 201.) 



Fig. 47. — Nuculana acuta. The right valve of a specimen from the Pennystone Ironstone, Coalbrookdale. (Page 208.) 



Fig. 47 a. — Nuculana acuta. An enlarged view of the above. (Page 208.) 



