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



tlie base of the caudal fin, the anal fin, a portion of the dorsal fin, and about forty 

 vertebra;, of which sixteen are caudal. The length of the spinal column, which 

 is preserved, is 0-09 m., and the total length of the fish, as indicated by this 

 portion, was probably 0-15 m. The vertebrfe are as high as broad, bi-concave, 

 and much constricted medially. Each vertebra supports a haemal and neural 

 spine, long and slender, and as nearly as possible equal in length. Portions of the 

 anal fin are preserved, but not sufficient to by so indicate precisely its form and size. 

 The dorsal fin is represented by twelve fin-rays; the posterior rays are 0-05 m. in 

 advance of the caudal fin. Opposite the anterior rays of the dorsal fin the ribs 

 commence. They are strong and a considerable length. The tail is imperfect, 

 only the base being preserved. No scales can be identified. 



Formation and Locality. — Etage Danien : Saltholm Limestone ; Limhamn. 

 Ex coll. — University Geological Museum, Lund. 



Family.— HOPLOPLETJRID^, Pictet. 

 " Traits de Paldontologie," 2nd ed., vol. ii., p. 213. 



" Body generally with four series of sub- angular scutes, and with intermediate 

 scale-like smaller ones. One (?) dorsal only ; head long, with jaws produced." 



The family Hoploioleuridae was established by Pictet for fishes which were 

 devoid of scales properly so-called, but which are protected on the back and sides 

 by rows of scutes. The head is long and the jaws provided with pointed teeth of 

 unequal size. The bones of the head are frequently sculptured or granulose. 

 The genera associated in this family by M. Pictet are Dercetis, Agassiz ; * 

 Sauroramphus, Heckel;t Eurypholis, Pictet; J Pelargorhynchus, Von der 

 Marck ; § Leptotrachelus, Von der Marck ; || Plintrophorus, Giinther.^ The 

 fishes included in the genus Dercetis were considered by Agassiz to resemble the 

 sturgeons in the arrangement of the dermal scutes, and were grouped amongst the 

 Ganoids. Heckel held the same opinion with respect to the position of Sauro- 



* " Poisson Possiles." vol. ii., pt. ii., p. 258. 1843. 



t "Beitr. zur Kennt. der. Foss. Fische Osterreichs," p. 17. 1849. 



J " Desc. Poiss. Poss. du Mt. Liban.," p. 28. 1850. 



§ " Ueber einige 'Wirbeltliiere, &c., der 'WestphalisclienKreide." — Zeitschr. deutsch. Geol. Ges., vol. x., 



p. 242. 1858. 



II " Possile Piscbc, Krcbso \vaA Pflanzen aus dem Plattenkalli der jiingsten Kreide in "Westphalen." 

 — ^Palaeontograpliica, vol. ix., p. 61, pis. xi., xii., fig. 3. 1863. 



^ " Desc. of a New Poss. Pish from tlie Chalk."— Gcol. Mag., vol. i., p. 114, pi. vi. 1864. 



