Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 387 



of the genus S. (Bkinognathus) lewisii, Davis ("Trans. Roy. Dublin Soc," N. S., 

 vol. iii., p. 480, pi. xiv., fig. 4), from the cretaceous beds of Sahel Alma, Mount 

 Lebanon, so far as the crown is concerned, but the roots of the anterior teeth of 

 ^S*. lezvisii are deeply pronged: in this species they are short and widely 

 distended. 



Formation and Locality. — Danien: Faxe or Coraline Limestone, Annetorp. 

 Lower Senonien : Oppmanna. 



Ex coll. — Geological Museum, University of Lund. 



Genus. Odontaspis. Agassiz. 1838. " Rech. sur les Poiss. Foss.," vol. iii., p. 87. 



Second dorsal fin and the anal of equal size, scarcely smaller than the first 

 dorsal. No pit at the root of the caudal; side of the tail without keel. Teeth 

 of all but the few hindermost series with a long, tapering, acuminate median 

 cone with smooth cutting edges, base expanded with one or more pairs of lateral 

 denticles, larger and sharper than those of Lamna ; fourth tooth from the 

 symphysis upon each side of the upper jaw very small; the teeth of the most 

 anterior pair in the lower jaw small and relatively very slender. 



Agassiz regarded Odontaspis as a sub-genus of Lamna ; Miiller and Henle 

 considered that it was a distinct and well-defined genus, a view since accepted 

 by Dr. Giinther, and more recently by A. Smith Woodward, with considerable 

 modification. The remains of this genus are found in the Cretaceous series of 

 rocks, are abundant throughout the Tertiary formations, and still continue 

 represented at the present time by a few smwiving species. 



Odontaspis acuta, Davts. 



(PI. XXXVIII. , figs. 21-24.) 



1888. " Trans. Roy. Dublin Soc," N. S., vol. iv., p. 22, pi. v., figs. 1, 2. 



Teeth lanceolate, slender, curved sygmoidally, sharply pointed, expanded 

 base, with two pairs of lateral denticles acutely pointed and curved towards the 

 central crown. In the anterior teeth the crown rises to a height of 0-020 m., 

 with a width at the base of 0-005 m. The root between the bases of the second 

 denticle on each side is double that of the base of the crown in width. The 

 outer coronal surface is slightly convex, more or less depressed in the median 



TttANS. BOY. DTJBL. SOC. N.S., VOL. IV., PAHT VI. 3 K 



