Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 393 



the apex ; lateral teeth having the root much wider than the main portion of the 

 crown, which thus exhibits a sudden basal expansion behind, and often, also, in 

 front.''— (A. S. W.). 



The teeth of this species are smaller than those found in the English chalk, 

 and whilst offering great diversity in form, as exhibited in the specimens repre- 

 sented (Plate XXXIX., figs. 1—7), the small teeth, very short and extremely broad, 

 which Smith Woodward * represents as occupying the posterior portion of the 

 jaws, are not represented. The root is deeper but less divergent laterally than 

 those hitherto described ; the external surface is deeply concave ; the internal 

 surface exhibits a correspondingly prominent convexity. The oblique teeth from 

 the posterior portion of the jaw do not possess so great an expansion of the 

 internal surface of the root as those in front ; the root is flatter, as well as more 

 greatly expanded laterally. 



In the Danish collections this species is represented by examples from the 

 chalk of Saltholm and Annetorp ; all in the Mineralogical Museum. 



Oxyrhina mantelU has a very wide range both in time and the area over which 

 its remains have been discovered. It is a common fossil in the chalk of the south 

 of England, and is found in the Cretaceous rocks of Sarthe, in the north of France, 

 in Belgium, Germany, Bohemia, Galicia, Russia, Sweden, and Denmark ; and in 

 America it has been found in the Cretaceous beds of Kansas, the Mississippi, and 

 Alabama, and a closely related species, Oxyrhina haasti, Davis, has been discovered 

 in New Zealand. 



Formation and Locality. — Etage Danien : Saltholm ; Annetorp and Limhamn 

 Skane. Etage Senonien (zone with Actinomax mamillatus) : Oppmanna ; most 

 abundantly at the latter. 



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

 Mineralogical Museum of the University of Copenhagen. 



Oxyrhina lundgreni, Davis. 



(Plate xxxix., figs. 8—13.) 



The teeth comprised in this species exhibit considerable variation in form 

 and size. The anterior teeth are long, erect, with a slightly recurved apex ; 

 those which have occupied an intermediate position on the sides of the jaws are 

 shorter, with a broader base and greater curvature ; whilst the posterior teeth 

 are little more than half the length of those occupying an anterior position, and 



* Cat. of Foss. Fishes in the British Museum, part, i., pi. xvii., figs. 9-21. 



