PLATE VII. 



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



1. Physetee macrocephalus, LinncBus. 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, b, 

 transverse section. Red Crag Nodule-bed, Suffolk. 

 Harford Coll., M. P. G. 



3. a, b. Bal/Enodon physaloides, Owen. Slender tooth ; a, 



exterior, b, longitudinal section. Red Crag Nodule - 

 bed. Woodbridge. M. P. G. 



4. Orca citoniensis, Capellini. Tooth (after Lydekker). 



Red Crag Nodule-bed, Suffolk. Ipswich Mus. 



5. Globicephalus uncidbns, Lankester. Tooth (after Lan- 



kester). Red Crag Nodule-bed, Felixstow. 



6. Globicephalus dncidens, Lankester. Tooth (after Lan- 



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



