complete specimens, evidently belonging to two or three more forms, but which cannot be specifically identified until more complete material shall have been procured. Among these may be mentioned two valves, which are perhaps referable to the genus Atrypa. One of the specimens measures sixteen lines in length by fifteen in breadth, is uniformly convex, without fold or sinus, and is marked with numerous close radiating striae.
EXPLANATION OF PLATES IV.-VI.
Plate IV.
Fig. 1 . Lingula Lesueuri, Rouault.
2. — Rouaulti, Salter.
3. — Hawkei, Rouault.
4. — sp . ?
5. — Salteri, Dav.
6. Discina Vicaryi, Dav.
7. — incerta, Dav.
8. — ? Edgelli, Dav.
9. 10. Crania transversa, Dav.
11. Terebratula, sp. ?
12. Athyris incerta, Dav.
13. — ? erratica, Dav.
14. — ? budleighensis, Dav.
15. Nucleospira Vicaryi, Dav.
16. — — . Interior of dorsal valve, enlarged.
17. — — . Internal cast of same valve, enlarged.
18. — — . Both valves united, seen in profile.
19. Spirifera Verneuilii, Murch.
20. — — . Internal casts.
21. — macroptera, var. microptera. Internal cast.
22. — — — . Shell.
23. — octoplicata, Sow.
24, 25. Rhynchonella? ovalis, Dav.
26, 27. — Valpyana, Dav.
Plate V.
Fig. 1, 2, 3. Rhynchonella inaurita, Sandb. Internal casts.
4. — elliptica, Schnurr?
5, 6. — , sp. Internal casts.
7, 8. — Vicaryi, Dav. ?
9. Orthis redux, Barr. ? var. budleighensis.
10. — — . Interior of dorsal valve, enlarged.
11. — — . Interior of ventral valve, enlarged.
12. — — . Internal casts, natural size.
13. — Berthoisi? var. erratica, Dav.
14. — — . Internal cast of dorsal valve.
15. — — . Interior of same valve.
16. — — . Internal cast of ventral valve.
17. — pulvinata, Salter. Exterior.
18. — — . Internal cast of ventral valve.
19. — — . Internal cast of dorsal valve.
20. — Vicaryi, Dav. Internal casts of both valves, natural size,
21. — — . Exterior, enlarged.
22. — — . Interior of ventral valve, enlarged.
23. — Valpyana, Dav. Exterior, natural size,
24. — — . Internal cast of ventral valve.
25. — — . Interior of dorsal valve, enlarged.
26. Streptorhynchus crenistria, Phil.
