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



its width to 0"030m., and enables it to siqDport on each side a lateral denticle. 

 The outer coronal surface is convex in the median and upper parts ; the lower 

 part is depressed and flat ; a slight median ridge extends from the base one-third 

 of the height ; enamel smooth. The inner coronal surface is deeply convex, 

 expanding outwards at the base, without folds or striations. Lateral margins 

 trenchant, continuous with the lateral denticles ; the base of the enamel rises in a 

 gentle curve from each side to the centre on both the inner and outer surface. 

 The lateral denticles are strong, convex on each sm-face, rather more so on the 

 inner than the outer one ; margin with a sharp edge ; point inclined away from 

 the crown. Root large and massive, laterally extending beyond the enamelled 

 surface. The outer surface is depressed from the base of the crown; from the 

 inner coronal surface the root projects very boldly, extending forward nearly 

 horizontally, the diameter being 0"016m. The inferior surface of the root is 

 deeply concave in the middle, with lateral projections extending downwards at an 

 acute angle. 



The specimens referred to this species are from Limhamn, in the district of 

 Malma, in the Danien formation. They approach, on the one hand, Otodus 

 appendiculatus, Agassiz, and on the other, Otodus spathula, Sauvage ("Bibl. Ecole 

 Hautes Etudes," vol. v., No. 9, p. 32, pi. i., figs. 27-32). The latter is from 

 the white chalk occurring at Villavard, in the Sarthe. The crown is similar in 

 form to the species now described. The characteristic of the Sarthe species con- 

 sists in the lateral cones being separated from the principal one ; the enamel of 

 the latter does not extend to the former. This feature separates it clearly from 

 the Limhamn type, in which the lateral cones are connected by the continuity of 

 the enamel with that of the crown ; the downward projections of the root are 

 also much deeper than in the examples described by Sauvage ; and the root is 

 altogether much thicker. The latter character serves also to distinguish the 

 species from 0. appendiculatus, Ag. The crown of the tooth is stronger and thicker, 

 and more convex on both the inner and outer surfaces. 



Formation and Locality. — Etage Danien : Linhamn, Skane. 

 Ex coll. — Riksmuseum, Stockholm. 



