ELASMOBRANCHtt. 107 



pp. 290, 293, 295), but believed them to be remanie, and this no 

 doubt is the reason they have never been included in any published 

 lists of crag fossils. 



The occurrence of this genus in the Coralline and Red Crags was 

 noted by Prof. Prestwich, (Quart. Journ. Geol., Vol. XVII., pp. 

 118 and 349, 1871). 



ODONTASPIS (LAMNA) ELEGANS, AGASSIZ. 

 PLATE IX., FIGS 160, b. 



Lamna clegans was the name given by Agassiz (Poiss. Foss., 

 Vol. Ill, p. 289, 1843) to teeth from the Calcaire Grossier and 

 London Clay, examples being noticed as remanie in the English 

 Crag. Numerous examples from the Red Crag Nodule-bed of 

 Suffolk are in the Museum of Practical Geology ; some of which 

 are probably derived from older beds, being much rolled and worn ; 

 but many of them are beautifully perfect with the cutting edge 

 quite sharp, and these it is thought must be of Red Crag age. 



O. elegans has a wide range in time, having been met with 

 at various horizons from the Chalk of Maastricht to the Oligo- 

 cene of Belgium (vide Rutot, Ann. Soc. Geol. Belg. Vol. IL, 

 p. 34, 1 875), and the specimens above noticed show that it extended 

 at least as far as the Nodule -bed of the Red Crag of Suffolk. 



ODONTASPIS (LAMNA) CONTORTIDENS, AGASSIZ. 

 PLATE IX., FIGS. 17, b. 



This species, which was established by Agassiz (Poiss. Foss., 

 Vol. III., P. 294), and recognised by him in the English Crag, 

 is represented in the Museum of Practical Geology by several 

 teeth from the Nodule-bed of the Red Crag, most of which are 

 rolled and denuded, but some are perfect with the edges and 

 striations so sharp, they could scarcely have been derived from 

 any older formation ; and although O. contortidens is essentially a 

 Lower Eocene form, it seems to me that some of our specimens 

 from the Suffolk Crag must have lived at the time when this bed 

 was being deposited. 



At present I have been unable to detect any specimens which 

 could be undoubtedly referred to 0. Hopei, although this species 

 was mentioned by Agassiz as occurring in the Crag. Denuded 

 specimens of O. contortidens, having lost their striations, would 

 appear like O. Hopei. 



