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



unpublished observations on the selachian teeth found in the white chalk of Faxe 

 , and Saltholm. The opinions of an authority of so high eminence have been very- 

 valuable. The collection from the University Zoological Museum at Copenhagen 

 contains many specimens from the original museum formed by the late King 

 Christian VIII. I am also indebted to Dr. Johnstrup for stratigraphical 

 information respecting the localities in Denmark. Dr. Bernard Lundgren has 

 furnished me with a table of formations, showing also the districts in which the 

 localities occur from which fish remains have been obtained ; and a published 

 list of the fossil fauna of Sweden. And to Dr. Lindstrom I am under obligation 

 for a variety of information not easily enumerated. 



Dr. Henry Woodward, keeper of the geological collections at the British 

 Museum, has, with his usual kindness, afforded me every opportunity to compare 

 and study the specimens under his charge with the Scandinavian ones ; and to 

 Mr. A. Smith Woodward I am indebted for suggestions and information bearing 

 on the subject of this memoir, and for the uniform courtesy and kindness with 

 which he has given me advice and assistance both in and out of the Museum. 



The ichthyic fauna of the Swedish chalk offers several points of considerable 

 interest. It has shown, generally, a closer relationshiiD to the cretaceous fauna of 

 the North of Europe, as represented in the English and French chalk, than to the 

 more highly specialized fauna of Asia Minor ; but it does not afford representatives 

 of several of the Physostomous Teleosteans such as Ichthyodectes, Protosphyrsena, 

 and Pachyrhizodus, which occur in the English chalk, and have been found in the 

 Upper Cretaceous rocks of North America. A few teeth occur in the Swedish 

 chalk which are referred to Enchodus. Examples of a large species of Dercetis 

 occur, and some fragmentary remains which are probably Clupean. The highly 

 specialized forms, such as Cheirothrix, Rhinellus, Spaniodon, Emygnathus, and 

 Eurypholis, found in the Lebanon chalk, do not occur in the chalk of Sweden. 

 Amongst the Acanthopterygian Teleosteans the most important are the remains of 

 Beryx and Hoplopteryx. These genera are represented in both the English and 

 Lebanon chalk. 



The great majority of the fish remains are Selachian, and comprise no fewer 

 than twenty-four species. Three species, viz. Carcharodon rondeletii (M. & H.), 

 Otodus obliquus (Ag.), and Odontaspis acutissimus (Ag.), are usually regarded and 

 known as indicating a tertiary fauna ; but in the Scandinavian chalk they have 

 been found in association with many undoubted Cretaceous forms in the Faxe 

 limestone or chalk, and so appear to prove that these species were in existence 

 before the advent of the deposition of the Tertiary strata. The Tectospondylic 

 sharks* are represented by two species of Phychodus and indefinable teeth of 



* C. Hasse, Das Natiirliclie System der ElasmobrancUer, 1879-82. 



