LAMNID^. 
399 
TJie limits of this species are not readily determinable, but we 
venture to follow Sauvage {he. eil. 1872) in assigning to it the very 
largo teeth mentioned below. We would furlljer suggest ttmt there 
are no differences of specific value between the originals of Sauvage 's 
figs. GO, 01, and that of the same author’s figs. 70-72 ; and Olodus 
jiimjuu is thus relegated to the above synonymy. 
Geinitz (for. cit. 1875) considers that the so-called Hyhodm gracilis, 
lleuss, and II. regidaris, lleuss, are founded upon teeth of the young 
of this species. 
Form. 4' Loc Cenomanian and Turonian ; S.E. England, W. 
France, Belgium, Saxony, and Bohemia. Senonian : S.E. England. 
Cretaceous : Texas, and (?) Galicia. 
P. 5908. Two imperfect teeth ; Greensand, Belgium. Purchased. 
39054. Large anterior tooth ; Chalk, Surrey. Bowerhank Coll. 
25786. Imperfect tooth ; Chalk, Sussex. Dixon Coll. 
P. 5402. Tooth ; Chalk, near Lewes. 
Presented by P. E. Coombe, Esq., 1888. 
41704. Imperfect tooth ; Chalk, near llochester. 
Toulmin Smith Coll. 
P. 1288. Imperfect anterior tooth; English Chalk. Egerton Coll. 
Lamna xnacrorhiza, Cope. 
1875. Lamna macrorhiza, E. I). Cope, Vert. Cret. Form. West (Rep. 
U.S. (ieol. Surv. Territ. vol. ii.), p. 297, pi. xlii. figs, f), 10. 
Pyi>e. Detached teeth. 
Teeth of small size, elevated though robust, the maximum total 
height being about 0'025. Outer coronal face flat, or nearly so, 
with a faint median longitudinal elevation, and often a few folds at 
the base ; inner coronal face very convex, smooth ; cutting-edges 
sharp. A single pair of relatively large, narrow, acuminate lateral 
denticles, divergent, also often marked at the base by minute vertical 
folds. Root with a prominent inward projection below the base of 
tho crown ; nutritive foramen in a groove. 
Form. 4' Loc. Niobrara Formation: Kansas, U.S. A. Albian : 
S. England. Cenomanian : S.E. Russia. 
37398. Small tooth ; Gault, Folkestone, Kent. Purchased, 1863. 
P. 12 a» Two large teeth ; Folkestone. Gardner Coll. 
