ii55 



Explanation of Fio. 99. 



N.C. = Norwich Crag. U.F.B. = Upper Freshwater Bed. 



1, la. Mimomys ■pliocanicii.s For.syth Major. Right m^ young, crown 

 and outer views ; cement spaces clo.sing, third outer fold intact. 

 N.C. {Norwich Mas., No. 971a, Fitch Coll.). 



2, 2a. M . plioccenicus. Right w, young, crown and outer views ; cement 

 spaces closed, third outer fold intact. U.F.B., Ostend (but 

 lirobably derived from an older deposit, the base of the tooth 

 being somewhat rolled and its mineral condition as in Norwich 

 Crag fossils) (Norwich Mit,^., No. 2708a, Ourney Coll.). 



3. it/, flioccenicuit. Left w?, adult, crown view; for outer and inner 

 j views see PI. XIII, tigs. 1, la. Roots moderately long, inner 



portion of third outer fold just insulated. N.C, Yarn Hill 

 (^■1. S. Kennard). 

 4,4a. M. plioccenicu.s. Left m^ adult, crown and outer views; with 

 short roots, inner portion of third outer fold completely insulated. 

 N.C, Thorpe [Norwich Mus., No. 91U (a). Fitch Coll.). 

 5. M. pliocienicus. Right /«i old, crown view; roots very long, 

 " prism-fold," third outer fold and enamel islet worn away. 

 N.C, Yarn Hill (.4. S. Kennard). 

 (), (ia. J/, reidi Hinton. Left m^ adult (type of species), crown and 

 outer views. Weybourne Crag, Trimingham (Mv.t. Pract. Geol., 

 No. C.R. 83G). 



7. M. intermediu.i Newton. Left wij very young, crown view ; pulp 

 cavities open, anterior coronal tubercles present, " prism- 

 fold " and third outer valley intact. U.F.B., West Runton 

 [Savin Coll., No. 9,7.30.3). 



8. M . intermediu.s. Right /«, very young, crown view (outer view, 

 PI. XIII, fig. 5). U.F.B., 'West Runton [Savin Coll., No. 

 9.7.24.1.) 



9. M. i7iter>nediii.s. Right m^ young, crown view (outer view, 

 PI. XIII, fig. 6); inner portion of third outer fold nearly 

 insulated. U.F.B. , West Runton [Savin Coll., No. 9.7.30.1). 



10. M. intermediu.s. Left w^ young, crown view (outer view, PI. 

 XIII, fig. 4) ; inner portion of third outer valley insulated. 

 U.F.B., West Runton [Savin Coll., No. 9.5.4.1). 

 11, 11a. M. intermedius. Left m^ young, crown and basal views; pulp 

 cavities open, third outer fold insulated. U.F.B., West Runton 

 [Savin Coll., No. 9.7.30.2). 



12. M. interynediiLi. Right y/ij, r«2 and m^ adult, crown views (type 

 of species). U.F.B., West Runton [Mii.s. Pract. Geol.). 



13. M. .savini Hinton. Left j«j very young, crown view (outer view, 

 PI. XIII, fig. 9). U.F.B., West Runton [Savin Coll., No. 

 9.4.23.1). 



14. M. savini. Right »«i young crown view. U.F.B., West Runton 

 [Mu.s. Pract. Geol., No. 959J). 



15. M. .savini. Left m^ young, crown view (outer view, PI. XIII, 

 fig. 7). U.F.B., West Runton [Savin Coll., No. 9.4.24.1). 



IC. M. savini. Right /Hj, iiu and 11I3 adult, crown view. U.F.B., 

 West Runton [Savin Coll., No. 820.2). 



17. M. majori Hinton. Right m^ very young, crown view (outer 

 view, PI. XV, fig. 1); fourth outer valley represented by an 

 ephemeral islet and persistent external vestige. U.F.B., West 

 Runton [G. White Coll.). 

 18, 18a. M. newtoni Forsyth Major. Left m^ imperfect, young, crown and 

 outer views. Upper Pliocene, Tegeleu-sur-Meuse [B.M. 'pre- 

 sented by Mr. and Mrs. Clement Reid). 



19. M. newtoni. Left m^ adult, crown view. " Claj'-gravel," East 

 Runton (Mus. Pract. Geol., No. C.R. 91dA). 



