﻿PLATE XV. 



(All figured of the natural size except fig. 22.) 



Fig. 



1. Aptychopsis Barrandeana, sp. nov. Left valve. Mus. Geol. Surv. Scotland. 



(P. 101.) 



2. — cordiformis, sp. nov. Two valves. Woodwardian Mus. (P. 103.) 



3. — Lapworthi, II. W. Two valves, crushed. Woodwardian Museum. 



(P. 106 ) 



4. — ovata, sp. nov. Carapace, squeezed obliquely. Mus. Geol. Surv. 



Scotland. (P. 108.) 



5. — — — Two valves, Mus. Geol. Surv. Scotl. (P. 109.) 



6. — lata, sp. nov. Left valve. Mus. Geol. Surv. Scotland. (P. 104.) 



7. — Lapworthi, H. W. Left valve. British Museum. (P. 107.) 



8. — — — Two valves. British Museum. (P. 108.) 



9. — — — Carapace. British Museum. (P. 108.) 



10. — — — Two valves. Mus. Geol. Surv. Scotl. (P. 107.) 



11. — glabra, H. W. Two valves, squeezed obliquely. British Museum. 



(P. 105.) 



12. — Wilsoni (?), H. W. Two valves, imperfect. Mus. Geol. Surv. 



Scotland. (P. 106.) 



13. — angulata (?) (Baily). Right valve. Mus. Geol. Surv. Scotland. 



(P. 110.) 



14. — Barrandeana, sp. nov., var. brevior, nov. Left valve, rounded at 



ends. [This should have been set straight up.] 

 British Museum. (P. 102.) 



15. — Wilsoni, H. W. Two valves. Mus. Geol. Surv. Scotl. (P. 106.) 



16. — — — Two valves, squeezed obliquely. British Museum. 



(P. 106.) 



17. — angulata (?) (Baily). Two valves, squeezed obliquely. Wood- 



wardian Museum. (P. 111.) 



18. — oblata, sp. nov. Two valves (small). Mus. Geol. Surv. Scotland. 



(P. 111.) 



19. — angulata (Baily). Two valves, slightly oblique. Mus. Geol. Surv. 



Ireland. (P. 110.) 



20. — subquadrata, sp. nov. Two valves, slightly squeezed. Mus. Geol. 



Surv. Ireland. (P. 109.) 



21. — oblata, sp. nov. Two valves. Mus. Geol. Surv. Scotl. (P. 111.) 



22. — Lapivorthi, H. W. Magnified 2^ diameters. Carapace (very 



small), valves slightly displaced. British 

 Museum. (P. 108.) 



23. oblata, sp. nov. Two valves (small). British Museum. (P. 112.) 

 2 I . Pinnocaris Lapworthi, R. Etheridge, jun. Left-hand moiety of a carapace. 



Kendal. British Mus. (P. 118.) 



