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



Notidanus detitatus, A. S. Woodward. 

 (PI. xxxvm., fig. 8.) 



Notidanus dentatus. Woodward, A. S., 1886. " Geol. Mag.," vol. in., p. 214, 



pi. VI., figs. 17, 18. 

 Notidanus dentatus. Davis, James W., 1888. " Trans. Roy. Dublin Soc.,"N.S., 



vol. iv., p. 36, pi. VI., figs. 9-12. 

 Notidanus dentatus. Woodward, A. S., 1889. " Cat. Foss. Fishes in Brit. Mus.," 



pt. i., p. 159. 



A single example of this species is preserved in the University's Mineralogical 

 Museum at Copenhagen. It is a tooth of the lower jaw, and is, unfortunately, 

 imperfect. Sufficient of the tooth is preserved to render its identification certain. 

 The part preserved consists of the principal cone, and a second, smaller one, 

 behind ; whilst in front are six denticles ; the length of the base of the crown is 

 0-02 m. ; the height of the principal cone is O'Oll m., that of the second one is 

 0'008 m. ; both are arched backwards. The denticles diminish gradually in size 

 forwards. They, like the cones, are robust, rounded at the point, and whilst more or 

 less curved backwards, are more erect than the cones. The root is not preserved. 



The presence of denticles in the place of the ordinary serrated anterior margin 

 of the tooth serves readily to distinguish this species. The original description 

 by Smith Woodward was of teeth contained in a collection sent in 1876 to 

 the British Museum by Sir James Hector, collected at Amuri BluS in New 

 Zealand. The single example of the teeth of the lower jaw possessed only three 

 denticles on the anterior surface, and there were three additional cones behind 

 the principal one. When describing the fossil fish remains of the Cretaceo- 

 Tertiary formations of New Zealand, I was indebted to Sir James Hector for the 

 loan of the Geological Survey collection from the Wellington Museum, which 

 contained additional and better preserved specimens than those previously 

 described. The characteristic denticles in front of the principal cone were found 

 to reach five in number, whilst the same number of cones succeeded the largest 

 one posteriorly. The specimen now described possessed a still larger number, 

 and six denticles extended anteriorly ; but the general character of the tooth 

 appears to render its relationship beyond doubt ; and although so widely separated 

 from each other geographically, they are not widely separated in geological age. 



No tooth has yet been identified belonging to the upper jaw, but it is not 

 improbable that the dissociated cusps or denticles of the teeth may exist amongst 

 the large number of teeth derived from the Faxe chalk. 



Formation and Locality. — Etage Danien (Nyere Kridt) : Faxe. 



Ex coll. — Mineralogical Museum of the University of Copenhagen. 



