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



rarely preserved perfect ; deeply bifurcated ; outer surface concave, retreating 

 directly from the base of the crown ; inner surface bulbous and prominent ; 

 lateral branches separated at a right angle. A minute lateral denticle is occasion- 

 ally preserved, tipped with enamel, and slightly separated from the principal cone. 

 The posterior teeth are broader, shorter, and more compressed than the anterior 

 ones. A tooth apparently proportionate in size to those described above is 

 0'025 m. in height and 0"010 m. in width ; its outer surface is flatter, and the 

 inner less convex, whilst its curvature is more pronounced than is that of the 

 anterior teeth ; the branches of the root are smaller and more widely separated, 

 and the inner surface is less bulbous. 



This species is most abundantly represented in the Swedish collections from 

 the Senonian formation at Oppmanna ; whilst to the Danish collections the Faxe 

 and AnnetorjD beds, in the Danian series, have contributed most largely. It may 

 be noted that the specimens from Faxe are very abundant, but they are generally 

 smaller than those from Annetorp. 



Formation and Localities. — Etage Danien : Faxe Limestone : Saltholm ; 

 Annetorp ; Limhamn ; Malma district. Etage S^nonien Inferieur : Kjuge, Scania ; 

 Ifo ; Oppmanna ; District of Kristianstad ; Sisseback. 



Ex coll. — Geological Museum, Lund University ; Riksmuseum, Stockholm. 



Lamna incurva, Davis. 

 (PI. XL., figs. 18-24.) 



Lamna incurva, . . . Davis, J. W., 1888. " Trans. Roy. Dublin Soc," 



ser. II., vol. iv., p. 17, pi. iii., figs. 2—5. 



Odontaspis incurva, . . Woodward, A. S., 1889. "Cat. of Foss. Fishes 



in the Brit. Museum," p. 372. 



Teeth robust; crown smooth, with marked sigmoidal curvatui'e; height of 

 anterior teeth 0'020m. ; breadth at the base 0*005 m., from which the tooth tapers 

 to a point ; oiiter coronal surface convex ; inner surface deeply convex ; the lateral 

 margins form a cutting edge near the apex ; nearer the base the sides of the teeth 

 are rounded. A comparatively small number of specimens possess a single pair 

 of lateral denticles, minute and sharp-pointed. The crown of the posterior teeth 

 is shorter than that of the anterior ones ; it is broader, more rapidly acuminate 

 and compressed. The root is prominently bulbous on the inner sm-face ; a deep 

 vertical notch extends along it ; lower, the root is divided into two fangs, at no 

 great distance apart in the front teeth, but much more widely separated in those 

 situated behind. 



