Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 381 



further back in the jaw. The principal cone is not relatively so much larger than 

 those behind, as it is in the example already mentioned. 



The tooth from the lower jaw is smaller than those from the upper, but 

 exquisitely preserved. It is 0*0 10 m. in length. There is a series of nine cones 

 diminishing gradually and uniformly from the principal one backwards. On the 

 anterior margin of the first cone is a number of minute serrations. The root is 

 deeper than the height of the longest cone, large and massive. 



In the collection from the Zoological museum at Copenhagen specimens of 

 N. microdon are preserved which have been obtained from the Nyere Kridt at 

 Stevns, in Denmark ; from Terkild-Skov, in the Island of Seeland ; and in this 

 museum, and also in the museum of the Geological Survey, there are numerous 

 specimens, mostly fragmentary, from the coraline chalk of Faxe. The average 

 size of the teeth from Faxe is much larger than those from the cherty chalk. The 

 first denticle is proportionally not so high as compared with the succeeding ones 

 as it is in the teeth of the upper jaw, already described, and the denticles have 

 generally a more erect appearance. 



A single representative of this species occurs in the collection of fishes from the 

 Riksmuseum of Stockholm. The specimen is 0-007 m. in length ; the crown 

 consists of seven cones, each sharply pointed, slightly curved backwards, and 

 diminishing in size from the anterior principal one. The first cone is 0*002 m. 

 across the base, and 0*003 m. in height along the anterior border. The latter is 

 provided along its lower half with a series of minute but well-marked denticula- 

 tions. The root is not well preserved. Fragments appear to indicate that its 

 depth was about equal to the height of the crown. This example is from the 

 chalk of Limhamn, in the district of Malma, in South Sweden. 



Formation and Locality. — Etage Danien : Malmstrom ; Stevns, in Denmark ; 

 Terkild-Skov, in the Island of Seeland ; Limhamn, in the District of Malma ; and 

 the coraline chalk of Faxe. 



Ex coll. — Riksmuseum, Stockholm ; Zoological Museum, Copenhagen ; Uni- 

 versity Museum, Lund ; Mineralogical Museum, University of Copenhagen. 



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