PLATE XLVII. 



Fig. Page. 



1. Notidanus microdon, Agassiz; anterior upper tooth, inner view, twice 



nat. size. — Zone of Belemnitella mucronata; Norwich. B. 1\I. 



no. 24927. 222. 



2,3. Ditto; two lateral upper teeth, outer and inner view respectively, 



twice nat. size. — Chalk ; Kent. Harford Collection (B. M. no. 



P. 5596). 223. 



4. Ditto; lateral lower tooth, outer view, twice nat. size. — Zone of Marsu- 



pites (Uintacrinus-b&nd) ; near Salisbury. Dr. H. P. Blackinore's 

 Collection. 223. 



5, 6. Ditto ; two lateral lower teeth, outer and inner view respectively, 



twice nat. size. — Zone of Belemnitella mucronata; Norwich. Bay- 

 field Collection (B. M. nos. 35648, 48950). 223. 



7-12. Squatina cranei, A. S. Woodward; crown of anterior teeth (7, 8) and 

 basal view of root of same (7 a, 8 a), basal view of root (9) and outer 

 view of crown (10) of lateral teeth, five times nat. size; also 

 shagreen granule (11), fifteen times nat. size, and spinous tubercle 

 in side view (12) and from above (12 a), three times nat. size. — Zone 

 of Holaster subglobosus ; Clayton, Sussex. Willett Collection no. 

 183, Brighton Museum. 224. 



13-18. Piychodus mammillaris, Agassiz; associated set of teeth, one (13) 

 from lower middle row, another (14) from upper inner paired 

 row, and the others (15-18) also from paired rows, crown-view and 

 outline-section of crown, nat. size. — Chalk; Guildford, Surrey. 

 B. M. no. 27032. 230. 



19, 20. Ditto ; associated teeth of inner paired rows and (o') upper middle 

 row, nat. size. — Chalk ; near Chatham, Kent. Bowerbank Collec- 

 tion (B. M. no. 39127). 231. 



21,22. Ditto; two associated teeth, crown-view and (22a) the smaller 

 crown in outline-section, nat. size. — Turonian zone ; Lewes, Sussex. 

 B. M. no. P. 5389. 231. 



23-27. Ditto : associated teeth of coarsely-marked variety, crown-view and 

 one (24 a) also in outline-section, nat. size. — Ibid. Mantell Collec- 

 tion (B. M. nos. 4391, 4388, 4389, 4408, 4440). 231. 



