400 
SELACmi. 
47218 b, P. 12 b. Ten examples ; Folkestone. Gardner Coll. 
P. 5560. Five tooth ; Cenomanian, Saratov, Russia. 
By exchange, 1888. 
Lamna crassa (Agassi/.). 
1843. Otodus crassm, Ij. Agassiz, Poiss. Foss. vol. iii. p. 271, pi. xxxvi. 
figs. 29-31. 
1864. Otodus crassus, V. Kiprijanoff, Bull. Soc. Imp. Nat. Moscou, 
pt. ii. p. 384, pi. ii. figs. 4-20. 
Type. Imperfect teeth. 
Teeth robust, the orown 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 prominence below the base of the crown. 
Form. Loc. Cenomanian : Bavaria and 8.E. Russia. Danian : 
Belgium h 
P. 5554. Imperfect tooth ; Craie phosphatee, Ciply, near Mens, 
Belgium. By exchange, 1888. 
P. 5833. Four teeth, and five dental crowns ; Ciply. 
Presented by Mans. A. Ilouzeau de Lehaie, 1888. 
The following four tooth 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. 
48956 b. Two tooth, one measuring 0'027 in total height ; Upper 
Chalk, Norwich. Bayfield Coll. 
P. 1282 a. Tooth with imperfect root; Upper Cretaceous, Maa.stricht, 
Holland. Egerton Coll. 
P. 5832. Tooth ; Cruic phosphatee, Ciply, near Mons, Belgium. 
Presented by Alons. A. Ilouzeau de Lelmie, 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 
‘ This species is also recorded from the Cretaceous of Alabama by E. W. 
Gibbes, Joum. Acad. Nat. Sci. Thilad. [2] vol. i. (1849) p. 200, pi. xxvi. fig. 142. 
