PLATE XXIII. 



Fig. 1. — Spathella cylindrica. A right valve from the Redesdale Ironstone. 

 My Collection. (Page 154.) 



Fig. 2. — Spathella cylindrica. A right valve. The type of M'Coy's Cypri- 

 cardella cylindrica in the Griffith Collection, Museum of Science and Art, Dublin. 

 (Page 154) 



Fig. 3. — Spathella cylindrica. A left valve, the type of Cypricardia socialis, 

 M'Coy. Same Collection. (Page 154.) 



Fig. 4. — Spathella cylindrica. The cast of a right valve, showing, Fig. 4 a, the 

 cast of the hinge plate and cardinal teeth, from Poolvash, Isle of Man, and 

 Redesdale, Northumberland. My Collection. (Page 154.) 



Fig. 5. — Spathella tnniida. A right valve from Thorpe Cloud, with view of 

 escutcheon and umbo (Fig. ba). My Collection. (Page 155.) 



Fig. 6. — Spathella tumida. One of the specimens figured as Sanguinolites 

 plica tus by M'Coy. In the Griffith Collection, Museum of Science and Art, 

 Dublin. (Page 155.) 



Fig. 7. — Spathella tumida. A bivalve example from Castleton, incomplete 

 posteriorly. My Collection. (Page 155.) 



Fig. 8. — Parallelodon normalis. A right valve from the Carboniferous Lime- 

 stone of Derbyshire. My Collection. (Page 136.) 



Fig. 9. — Parallelodon elegans. A right valve from the Carboniferous Limestone 

 of Hill Bolton, Yorkshire. My Collection. (Page 135.) 



Fig. 10. — Paralleledon elegans. A left valve from the Carboniferous Limestone 

 of Withgffl, Yorkshire. My Collection. (Page 135.) 



Fig. 11. — Parallelodon angustus. A right valve, incomplete in front, from Nine 

 Standard Rigg, Westmoreland. My Collection. (Page 137.) 



Fig. 12. — Parallelodon angustus. A right valve, showing the anterior end. 

 Same locality and Collection. (Page 137.) 



Fig. 13. — Parallelodon angustus. A left valve, showing the hinge plate pos- 

 teriorly, of which Fig. 13 a is an enlarged view. 



Fig. 14. — Sanguinolites Monensis. The left and a portion of the right valves, 

 from Poolvash, Isle of Man. My Collection. (Page 155.) 



Figs. 15, 16. — Sanguinolites Monensis. Right and left valves. Same locality 

 and Collection. (Page 155.) 



Fig. 17. — Sanguinolites vexillum. The edentulous hinge plate of a right valve, 

 from Linn Spout, Dairy, with enlarged view (Fig. 17 a). My Collection. 

 (Page 156.) 



Fig. 18. — Sanguinolites vexillum. A left valve, showing the hinge plate, Figs. 

 L8 a and 18 b. Same locality and Collection. (Page 156.) 



Figs. 19, 20. — Sanguinolites vexillum. Same locality and Collection. (Page 156.) 



