LAMNTD2E. 
399 
The limits of this species are not readily determinable, but we 
venture to follow Sauvage (Joe. cit. 1872) in assigning to it the very 
large teeth mentioned below. We would further suggest that there 
are no differences of specific value between the originals of Sauvage s 
figs. 60, 61, and that of the same authors figs. 70-72 ; and Otoclus 
gnnguis is thus relegated to the above synonymy. 
Geinitz (Joe. cit. 1875) considers that the so-called Hybodus gracilis, 
lleuss, and H.regularis, Reuss, are founded upon teeth of the young 
of this species. 
Form. 4' Loc. Cenomanian and Turonian : S.E. England, AY. 
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. BoioerhanJc Coll. 
25788. Imperfect tooth; Chalk, Sussex. Dixon Coll. 
P. 5402. Tooth ; Chalk, near Lewes. 
Presented by P. E. Coombe , Esq., 1888. 
41704. Imperfect tooth; Chalk, near Rochester. 
Toulmin Smith Coll. 
P. 1288. Imperfect anterior tooth; English Chalk. Egerton Coll. 
Lamna macrorhiza, Cope. 
1875. Lamna macrorhiza, E. D. Cope, A ert. Cret. Form. A\ est (Rep. 
U.S. Geol. Surv. Territ. vol. ii.), p. 297, pi. xlii. figs. 9, 10. 
Type. 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 ftCcaxEeMp 
denticles, divergent, also often marked at the base bj T minute vertical 
folds. Root with a prominent inward projection below the base of 
the crown ; nutritive foramen in a groove. 
Form. § Loc. Niobrara Formation: Kansas, U.S.A. Albian : 
aU S. England. Cenomanian: S.E. Russia. r^3 • 
r ^ 
37398. Small tooth ; Gault, Folkestone, Kent. Purchased , 1863. 
P. 12 a. Two large teeth ; Folkestone. 
Gardner Coll. 
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