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



delicate outline. Two species have been described by A. E. Reuss* from the 

 Planerkalk of Bohemia and Saxony, under the names of ScylUum crassiconum 

 and ScylUum humholdti ; these were afterwards regarded by H. B. Geinitz,f and 

 his determination was accepted by Anton Fritsch,J as distinct from the genus 

 Scyllium, and they were transferred to the genus Scylliodus, Agass. The latter 

 is considered by A. Smith Woodward § as synonymous with Scyllium, who thinks 

 the two species of teeth are doubtfully associated with the genus. A comparison 

 of the teeth now described with the plates cited, whilst exhibiting a superficial 

 resemblance of the coronal portion, confirms the doubt expressed by Smith Wood- 

 ward ; the roots of the teeth are of difFerent form, and wanting in breadth and 

 definition; instead of the concave under-surface of Scyllium they are deeply 

 convex. 



Formation and Locality. — Etage Danien : Terkild-Skov in Seeland. 

 Fx coll. — Zoological Museum of the University of Copenhagen. 



Family.— LAMNIDiE. 



Genus. Scapanorhynchus. A. S. Woodward. 1889. " Catalogue of Fossil 

 Fishes in the British Museum," part i., p. 351, 



>SV«.— Rhinognathus. Davis, J. W., 1887. " Trans. Royal Dublin Society," N.S., 



vol. iii., p. 480. 



Body slender; snout much elongated. Second dorsal fin small, placed 

 immediately above a long anal. Caudal fin much elongated, inferiorly notched 

 near the extremity ; pectoral and ventral fins large. Anterior teeth with a 

 long slender principal cusp, and mostly with a pair of minute lateral cusps ; 

 postero-lateral teeth wider, central cusp shorter. 



This genus was instituted, with the name Rhinognathus, and embraced a num- 

 ber of fishes, mostly in an imperfect condition obtained from the upper cretaceous 

 beds of Mount Lebanon collected by the Rev. J. F. Lewis, now in the Edinburgh and 

 British Museums. Unfortunately the name had been preoccupied by Fairmaire as a 

 name for a beetle, and a second was rendered necessary. This has been provided 

 by my friend Mr. A. Smith Woodward in the Catalogue of the Fossil Fishes in 



*Verstein. buhm. Kreideform, pt. i., p. 4, pi. ii., figs. 21, 22; pi. xii., fig. 11. {Hyhodus appen- 

 diculatus) and pi. it., figs. 4-8. 



f Palaeontographia, vol. xx., pt. i., p. 295, pi. lxv., fig. 8. 1875. 



X Eept. u. Fische bohm. Kreideform, p. 11, fig. 22, and p. 11, fig. 21. 1878. 



§ Cat. Foss. Fishes Brit. Mus., pt. i., p. 340. 1889, 



