400 
SELACH1I. 
•, r 
47218 b, P. 12 b. Ten examples; Folkestone. Gardner Coll. 
P. 5560. Five teeth; Cenomanian, Saratov, Russia. 
By exchange , 1888. 
Lamna crassa (Agassiz). 
1843. Otodus crassus, L. Agassiz, Poiss. Foss. vol. iii. p. 271, pi. xxxvi. 
figs. 29-31. 
1854. Otodus crassus , V. Kiprijanoff, Bull. Soc. Imp. Nat. Moscou, 
pt. ii. p. 384, pi. ii. figs. 4-20. 
Type. Imperfect teeth. 
Teeth robust, the crown attaining a maximum height of about 
0-04. Outer coronal face somewhat convex, generally with two 
or three broad vertical folds; a single pair of broad, acuminate 
lateral denticles. Root relatively compressed, scarcely forming an 
inward promiuence below the base of the crown. 
Form. Loc. Cenomanian : Bavaria and S.E. Russia. Danian : 
EelgiumI - 
P. 5554. Imperfect tooth ; Craie phosphatee, Ciply, near Mons, 
Belgium. By exchange,'1888. 
P. 5833. Four teeth, and five dental crowns; Ciply. 
Presented by Mons. A. Houzeau de Lehaie, 1888. 
The following four teeth seem to indicate a Cretaceous species 
distinct from any already described. The dental crown is moderately 
compressed, smooth, high, acute, and narrow ; a single pair of large 
acuminate lateral denticles is present; the root is relatively small. 
48956b. Two teeth, one measuring (>027 in total height; Upper 
Chalk, Norwich. Bayfield Coll. 
P. 1282 a. Tooth with imperfect root; Upper Cretaceous, Maastricht, 
Holland. Egerton Coll. 
P. 5832. Tooth ; Craie phosphatee, Ciply, near Mons, Belgium. 
Presented by Mons. A. Houzeau cle Lehaie, 1888. 
Lamna serra, sp. nov. 
Type. Detached teeth ; British Museum. 
Teeth of moderate size, the largest attaining a total height of 
about 0*018 ; crown elevated, smooth, and much compressed, with 
1 This species is also recorded from the Cretaceous of Alabama by R. W. 
Gibbes, Journ. Acad. Nat. Sci. Philad. [2] vol. i. (1849) p. 200, pi. xxvi. fig. 142. 
