380 Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 



Notidanus microdon, Agassiz. 



Squalus(?), tooth of. 



Notidanus microdon. 



Notidanus microdon. 



Notidanus microdon. 



Notidanus microdon. 



Notidanus microdon. 

 Notidanus microdon. 



Notidanus microdon. 



Notidanus microdon. 



Notidanus microdon. 



Notidanus microdon. 



(PI. XXXVIII., figs. 4—7.) 



Mantell, G. a., 1822. "Foss. South Downs," p. 227, 



pi. XXXII., fig. 22. 

 Agassiz, L., 1843. " Poiss. Foss.," vol. iii., p. 221, pi. 



XXVII., fig. 1. 

 Reuss, a. E., 1846. " Verstein. bohm. Kreideform," pt. ii., 



p. 98. pi. XLii., fig. 8. 

 GiEBEL, C. a, 1848. ''Fauna der Vorwelt," vol. i., 



p. 346. 

 Geinitz, H. B., 1850. " Charact. schicht. u. Petrefakt. 



Sachsbohm. Kreidegeb.," 2nd ed., p. 38, pi. ix., 



fig. 2. 

 Dixon, F., 1850. " Foss. Sussex," pi. xxx., fig. 30. 

 Geinitz, H. B., 1875. " Palseontogr.," vol. xx., pt. ii., 



p. 210, pi. XL., fig. 1. 

 Feitsch, a., 1878. "Rept. u. Fischebohm. Kreideform.," 



p. 12, woodcut, fig. 25. 

 Woodward, A. S., 1886. " Geol. Mag.," Dec. in., vol. iii., 



p. 213, pi. VI., figs. 10-15. 

 Woodward, A. S., 1888. "Proc. Geol. Assoc," vol. x., 



p. 287. 

 Woodward, A. S., 1889. "Cat. Foss. Fishes Br. Mus.," 



pt. i., p. 160. 



Teeth of this genus occur in the collections from Lund. They are in the hard 

 cherty chalk from Malmstrom. Of the three specimens two are from the upper jaw, 

 and one from the lower. Of the former the most perfect is 0'012m. in length 

 along the base of the crown. The crown consists of fom' cones or denticles ; the 

 largest is 0*005 m. in height, and on its anterior margin is a series of four or five 

 serrations ; the posterior denticles are much less elongated as compared with the 

 principal one ; all are sharply pointed. The root is large, and equal in depth to 

 the height of the largest cone ; the external surface of the root is concave ; the 

 internal surface prominent near the base of the crown, retreating lower down, so 

 that it forms, with the external surface, a very acute angle. 



The second upper tooth is somewhat smaller, and is probably from a position 



