Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 391 



of a second pair of denticles. In equally well preserved specimens of 0. acuta 

 there are generally two pairs. 



It is significant, and confirms to some extent the isolation of this species, that 

 at Kopinge and Saltholm the teeth of 0. acuta have not been found; whilst in the 

 localities in which that species occurs in abundance this remains undiscovered. 



Formation and Locality. — Etage Danien : Saltholm. Etage Senonien (zone with 

 Belemnites mucronatus) : Kopinge, in the District of Ystad. 



Ex coll. — Riksmuseum, Stockholm ; Greological Museum, University of Lund. 



Genus. Oxyrhina. Agassiz. 



" Recherches sur les Poissons Fossiles," vol. iii., 

 pp. 86 and 276. 



Second dorsal fin and the anal very small. A pit at the root of the caudal fin, 

 which has the lower lobe much developed ; side of the tail with a keel. Teeth 

 medium size, acutely triangular, compressed, slender, margins smooth, point acute, 

 without lateral denticles. Posterior teeth, base broad as compared with the 

 height, the teeth becoming smaller, shorter, and triangular. 



Oxyrhina was regarded by Agassiz as nearly related to Lamna, being dis- 

 tinguished by its more compressed form, and the absence of lateral denticles. It 

 occurs fossil in the Jurassic rocks, in the Cretaceous, and most abundantly in the 

 Tertiary formations. The genus is represented by one existing species. 



Squalus zygsena ? 

 Oxyrhina, 



Oxyrhina mantelli, 

 Oxyrhina mantelli, 



Oxyrhina mantelli. 



Oxyrhina mantelli, Agassiz. 

 (PI. XXXIX., figs. 1-7.) 



. Mantell, G. a., 1822. " Foss. S. Downs," 



p. 227, pi. XXXII., figs. 4, 7, 8, 10, 11, 26, 28. 

 . Geinitz, H. B., 1 839 {Ex. Ay.). " Charact. Schicht. 



u. Petrefakt. Sachs.-bohm. Kreidegeb.," p. 12, 



pi. I., fig. 4 (in part). 

 . Agassiz, L., 1843. "Poiss. Foss.," vol. iii., 



p. 280, pi. xxxiii., figs. 1—5 [non fig. 6), 7-9, 

 . Reuss, a. E., 1845. "Verstein. bohm. Kreide- 



form.," pt. i., p. 5, pi. m., figs. 1, 3, 5, 6 



(? figs. 2, 4). 

 . Giebel, C. G., 1848. "Fauna der Vorwelt.," 



vol. i., p. 357. 



