OF THE NORFOLK " FOEEST-BED.' 



Table of Measurements. 



32a 





Transverse 

 diameter. 



Length. 



Percentage 

 of length 



to 

 breadth. 



Vertebra in IVIr. Barker's collection ... 



Vertebra in Mr. Gunn's collection 



~, , , \ 1st lumbar 



in. 

 15-75 



14-5 



11-5 

 11-5 

 12-5 

 12-5 

 12-5 



130 

 130 

 14-0 

 14-5 



12-5 

 13-5 

 13-5 



140 

 140 

 14-0 

 13-75 



12-75 

 13-0 



in. 

 10-5 



11-0 



9-5 

 10-0 

 11-25 

 11-0 

 11-0 



100 

 10-25 

 12-5 

 12-75 



8-25 

 10-25 

 10-25 



9-5 

 10-0 

 12-0 . 

 11-25 



8-5 



8-5 



66-6 



75-8 



82-6 

 86-9 

 90-0 



88-0 

 88-0 



76-9 



78-8 

 89-2 

 87-9 



66-0 

 75-9 

 75-9 



67-8 

 71-4 



85-7 

 81-8 



66-6 

 65-3 



BalcBuoptera sp ^^ ^ ^ 



in the College of 1^,1 , u 



surgeons W }^fj^'™^- •;;•;• 



seum, no. 2io4j5|.,j^^^^^j 





BalcBnoptem mus- - ^ ^^ ; 



if^^'^^B"tish.J^4"3^ ; 



^^^'^"^ 5th caudal ......:.. 



SalcBnoptera Sib- ] 4th lumbar 



baldi, in British [ 1st and 2nd caudal 

 Museum I 5th caudal 





cephalus, in 5th lumbar 



1 British Mu- 1st caudal 



seum 5th caudal 



BalcBna s^.. Col- 1 ^^ 



legeofSurgeons, ^^^^^^ 



no. 2750 J 



EXPLANATION OF PLATE XL 



Fig. 1. Physeter macrocephalus. Tooth from the "Forest-bed" of Sidestrand. 

 Presented by Mr. Clement Keid to the Museum of Practical Geology. 

 I natural size. 



2. Same specimen, cut through longitudinally, to show pulp-cavity and 



proportion of dentine and cement. 



3. Same specimen. Longitudinal section of portion of dentine and cement, 



enlarged 20 diameters, to show the interlacing of the spindle-shaped 

 " Sharpey's fibres." a to h, dentine ; b to c, cementum. 



4. Same specimen A few of the " Sharpey's fibres," with a few lacunse, 



from lamina d in fig. 3, enlarged 215 diameters. 



5. Balana hiscayensis. Side view of the right half of seven ankylosed 



cervical vertebrjB, wanting the processes and neural arches, from the 

 " Forest-bed " of Overstrand, near Cromer, in the collection of 

 Mr. Jas. Backhouse, of York. ^ natural size. 



6. Same specimen, with neural arcbes restored in outline. ^ natural size. 

 1. Same specimen, front view. ^ natural size. 



8. Same specipaen, front view, with the neural arch and processes restored 

 in outline. ^ natural size. 



Discussion. 



Professor Flower said Mr. Newton's descriptions were very- 

 careful and exhaustive. Unfortunately, in the case of the larger 



