Davis — On the Fossil Fish of the Cretaceous Formations of Scandinavia. 385 



the British Museum, and the genus has been found to embrace other species 

 from various localities. From the Swedish chalk three species are added to the 

 genus in the following pages. 



Scapanorhynchus tenuis, Davis. 



(PI. XXXVIII., figs. 10-13.) 



Teeth small ; crown attenuate, curved inwards and at its point slightly 

 recurved; outer coronal surface and the apex smooth, inner surface minutely 

 grooved on the basal portion ; base, expanded laterally and supporting a minute 

 sharply pointed denticle on each side ; outer surface slightly convex ; inner 

 one rounded. Height of crown of anterior tooth 0-008 m. ; width of the base 

 equal to half the height. Latero-posterior teeth diminish in height to O'OOi m. ; 

 the width of the base is equal to the height ; crown curved laterally, otherwise 

 straighter than those in front. Root short ; prominently bulbous on inner 

 surface, outer one receding, inferior surface concave. 



The teeth of this species, together with those of S. latus, next described, only 

 exist in the Stockholm Collection from Oretorp. It is not without hesitation 

 that it is proposed to separate them into two species. The step appears to be 

 justified by the marked characteristics of the two, the graceful and slender 

 attenuation of the crown in this species is very distinct from the broad, com- 

 pressed crown of the next ; the smaller dimensions of the base and the minute 

 lateral denticles, whilst indicating close relationship, point to a specific 

 difference. 



Scapanorhynchus tenuis occurs in considerable abundance in the Faxekalk at 

 Faxe and Annetorp, and has also been found in the Saltholmskalk at Herfolge, 

 Grenaa, Lbgstbr and Eaunstriip. In the collection from the Zoological Museum 

 of the University of Copenhagen are specimens from Faxe, collected by the late 

 King Christian VIII. Teeth from the other localities named are comprised in 

 the collections of the Mineralogical Museum of the University of Copenhagen. 



Formation and Locality. — Etage Danien : Faxe; Herfolge; Grenaa, in Jutland; 

 Logstor ; Raunstriip ; Annetorp, Scania. Etage Senonian : Calshamn ; Oretorp, 



Ex coll. — Riksmuseum, Stockholm ; Mineralogical Museum and Zoological 

 Museum of the University of Copenhagen, Geological Museum of the University 

 of Lund. 



