PLATE VII. 



1 four-fifths natural size ; 2-5 natural size. 



1. PHYSETER MACROCEPHALUS, Linnceus. Longitudinal section 



of tooth. Forest-bed, Sidestrand. M. P. G. 



2. a, b. BAL^ENODON PHYSALOIDES, Owen. Half a tooth ; a, longi- 



tudinal section showing slender core of dentine, 6, 

 transverse section. Red Crag Nodule-bed, Suffolk. 

 Harford Coll., M. P. G. 



3. a, 6. BAL^ENODON PHYSALOIDES, Owen. Slender tooth ; a, 



exterior, 6, longitudinal section. Red Crag Nodule - 

 bed. Woodbridgc. M. P. G. 



4. ORCA CITONIENSIS, Capellini. Tooth (after Lydekker). 



Red Crag Nodule-bed, Suffolk. Ipswich Mus. 



5. GXOBICEPHALUS UNCiDENS, Lankester. Tooth (after Lan- 



kester). Red Crag Nodule-bed, Felixstow. 



6. GrLOBiCEPHALUs UNCIDENS, Lankester. Tooth (after Lan- 



kester). Red Crag Nodule-bed, near Sutton, Suffolk. 



