PLATE I. 



Microlestes Moorei. 



Fig. 



8. Lower molar, outer side. 

 8a. lb., front side. 



9. Lower molar, working surface. 



10. Lower (anterior?) molar, inner side. 



11. Lower (anterior ?) molar, side view. 



12. Lower (anterior ?) molar, side view. 



13. Upper canine. 



Fig. 



1. Upper molar, working surface. 



2. lb., inner side. 



3. lb., front side. 



4. lb., base view. 



5. Upper molar, outer side. 

 C. Lower molar, working surface. 

 7. Lower molar, working surface. 

 7a. lb., outer side. 



From near Frome, Somersetshire. In the possession of the discoverer, Charles Moore, Esq., F.G.S. 



Microlestes aniiqims. 



14. Lower molar, outside view") 



15. lb., inside view \ (after Plieninger). 



15a. lb., working surface J * 



From a llhaetic (Keuper) bone-bed at Diegerloch, Wiirtemberg. In the possession of the discoverer, Prof. Dr. 

 Plieninger, of Stuttgart. 



Microlestes rhaticus [Hypsiprymnopsis, Dawkins). 



16. Lower molar. 



16a. Side view of abraded surface. 



16«. Part of working surface, with probable outline restored. 



From Lower Rhsetic marlstone, Watchet, Somersetshire. In the Geological Museum, Oxford. 



All the foregoing specimens of Microlestes are magnified 4 diam. ; the natural size of the fossil is given in outline. 



17. Lower premolar (/3 4) of Hypsiprymnus mnrinus ; nat. size. 



18. lb. (^ 4) oi Beitongia peniciUata ; twice nat. size. 



19. Upper molar, working surface, Myrmecobius fasciatus ; magn. 4 diam. 



20. Lower molar, grinding surface, „ „ magn. 4 diam. 



21. Amphitherium Prevosiii, left mandibular ramus, mutilated ; nat. size. 

 21a. „ „ ib., dentigerous portion ; magn. 4 diam. 



22. „ „ left mandibular ramus, more entire ; nat. size. 

 22a. „ „ ib., horizontal portion ; magn. 2 diam. 



23. „ „ right mandibular ramus, with teeth ; nat. size. 

 23a. „ „ ib., magn. 2 diam. 



24. Myrmecobius fasciafus, left mandibular ramus and teeth ; nat. size. 



25. Amphitherium Broderipii, left mandibular ramus and molar teeth ; nat. size. 



25a. „ „ ib. ; magn. 2 diam. b. Ib., side-view of a molar tooth ; magn. 4 diam. 



26. Phascoloiherium Bucklandi, mandibular ramus and teeth ; nat. size. 



26 A. „ „ ib. ; magn. 2 diam. 



27. Stereognathus ooliticiis, portion of mandible, with three molar teeth, a, b, c, upper view ; nat. size. 



27 A. „ ,, ib., side view ; nat. size. 



28. „ „ inner side view of crown of molar, b ; magn. 6 diam. ~ 



29. „ „ outer side view of ditto ; magn. 6 diam. 



30. „ „ upper view, or grinding surface, of ditto ; magn. 6 diam. 



31. „ „ ib. of lower molar of PUolophus vulpiceps : magn. 2 diam. 



32. Spalacotherium tricuspidens, part of left mandibular ramus, with teeth ; nat. size. 



32 a. „ „ ib. ; magu. 2 diam. b. lb., oblique view of a molar tooth; magn. 4 diam. c. Ib., 



upper view of ditto ; magn. 4 diam. 



33. „ „ part of right mandibular ramus, with teeth ; nat. size. 



33 a. „ „ ib. ; magn. 2 diam. B. Ib., back view of a molar tooth ; magn. 4 diam. c. Ib., upper 



view of ditto; magn. 4 diam. 



34. „ „ part of left mandibular ramus ; nat. size. 



34 A. „ „ ib. ; magn. 2 diam. B. inner view of the two molars, 4, 5 ; magn. 4 diam. 



35. „ „ part of left mandibular ramus ; nat. size. 



35 A. „ „ ib. ; magn. 3 diam. 



36. „ „ part and impression of part of the right mandibular ramus ; nat. size. 



36 a. „ „ ib. ; magn. 3 diam. B. Ib., upper view of two fractured molars ; magn. 3 diam. 



37. „ „ part, and impression of part, of the same mandibular ramus in the counterpart slab of 



matrix. 



37 A. „ ,, ib. ; magn. 3 diam. 



38. „ „ left mandibular ramus. 



38 A. „ „ ib. ; magn. 2 diam. 



39. Spalacotherium minus, left mandibular ramus ; nat. size. 



39 a. ,. ,, ib.; magn. 3 diam. 



40. Phascolesles dubius, part of right mandibular ramus ; nat. size. 



40 A. „ „ ib. ; magn. 2 diam. 



41. „ „ fragment of right mandibular ramus ; nat. size. 



41 A. ,, „ ib. ; magn. 2 diam. 



Figs. 21, 22, 23 are in the Museum of Geology, University of Oxford, and are from the Lower Oolite, Oxfordshire. 

 The subject of fig. 25 is in the Museum of the Philosophical Society ,York, that of fig. 26 in the British Museum, that of 

 figs. 27 — 30 in the Collection of the Rev. J. P. B, Dennis, M.A. ; these are also from the Lower Oolite, Oxfordshire. 

 Tlie subjects of figs. 35 — 41 are from the fresh-water marl (mammaliferous) of the Middle Purbeck, Durdlestone Bay, 

 Dorsetshire; and are in the Collection of Samuel Husbands Beckles, Esq , F.E-.S., St. Leouard's-on-Sea. 



