PLATE II. 



Figs. 1 — 5. — Ludwigia Murchisonj!; (Sowerby). 



Fig. 1. — This is the original specimen figured by Sowerby in his 'Mineral 

 Conchology,' plate 550. I have had a fresh drawing made of this type for 

 comparison. Side view. Natural size. Natural History Museum, South Ken- 

 sington. From Holme, near Portree, Isle of Skye. (Page 17.) 



Fig. 2. — Front view. 



Fig. 3. — Young shell showing nodose primary ribs. Side view. Natural 

 size. My Collection. Bradford Abbas, Dorset. (Page 17.) 



Fig. 4. — Front view of same. 



Fig. 5. — A drawing of two consecutive suture lines of the original specimen. 

 Their simplicity and the distance between them are seen in fig. 1. (Page 19.) 



Figs. 6, 7. — Lioceras concavum (Soiverby). 



Fig. 6. — The original specimen figured by Sowerby in his ' Mineral Concho- 

 logy,' plate 94. Side view. Natural size. Natural History Museum, South 

 Kensington. From between Ilminster and Yeovil, Somerset. I have had this 

 original specimen redrawn to show its characters accurately. 



Fig. 7. — Front view of the same. 



