PLATE I. 



rig. 



1. Tracliynotus sukatus (p. 2), from the Upper Greensand of Wiltshire. In Mr. 



Cunnington's collection. 



2, 3. Mithracites vectensis (p. 1), from the Lower Greensand in the Isle of Wight. 



The former in the British Museum, the latter in Dr. Bowerbank's collection. 

 4 — 6. Three views of Xanthosia yibbosa (p. 3), from the Greensand of Wiltshire. In 

 the collection of Mr. Cnnnington. 



7. Etyus Martini (p. 5), from the Gault at Folkestone; restored from specimens in the 



author's collection. 



8. Under side of the same, from a specimen from the Greensand of Cambridge . 



9. Abdomen, and 



10. Footjaw of the same. 



11. Hand of the same species, from the Greensand of Cambridge. In Mr. Carter's 



collection. 



12. Front view of Etyus similis (p. 6 and 39), see PI. XI, fig. 15. 



13. Xanthosia granulosa (p. 4), from the Greensand of Cambridge. In Mr. Carter's 



collection. 



14. Diaulax Carteriana (p. C), from the Greensand of Cambridge. In Mr. Carter's 



collection. 



15. Front view of the same, shewing the orbits. 



16. Hand of the same. 



17. Cyphonotus incertus (p. 8), from the Greensand of Wiltshire. In the collection of 



Mr. Cunnington. 



18. Front view of the same specimen. 



19. A larger individual from the Cambridge Greensand. In Mr. Carter's collection. 



- 



Figs. 1, 7, 8, 14 — 18, are enlarged by one third. 



