Tertiary.) PALHONTOLOGY OF VICTORIA. [ Vertebrata. 
(Gironde), in beds of the same age at Saint Jean de Videy 
(Herault), and in Austria near Linz. The recognition of a second 
species of the genus is therefore of special interest. 
As the genus is unknown in strata above the Miocene, the 
discovery of this mammalian tooth in the Tertiary sands of the 
Victorian coasts is confirmatory of the Miocene age, which I had 
suggested for those beds from other orders of fossils. 
The specimen was found by Mr. Wilkinson, a successful young © 
geologist formerly attached to the Field Geological Survey, and 
to whom I have much pleasure in dedicating this important fossil. 
Rare in the Miocene Tertiary sands of Castle Cove, Cape 
Otway coast. 
EXPLANATION OF FIGURES. 
Puiate XI.—Figs. 1, la, 16, and 1d, different views, natural size, of the only specimen 
known. Fig. lc, portion of surface of crown magnified to show the sculpturing. 
PratTE XI, Fies. 2, 3: 
_CARCHARODON ANGUSTIDENS (Ac.). 
[Genus CARCHARODON (Aac.). (Sub-kingd. Vertebrata. Class Pisces. Order Plagios- 
tomata. Fam. Squalide. Sub-fam. Lamnine.) 
Gen. Char.—Teeth very large, compressed, triangular, without basal cavity, composed of 
massive dentine, with reticulated canals, edges serrated. ] 
Descriprion.—Teeth having the middle cusp acutely angular, with a broad 
short lateral-cusp on each side; outer face nearly flat, inner face strongly convex : 
cutting edges serrated, the serratures much larger on the lateral cusps than on the 
central one. Ganoine of surface smooth and highly lustrous. Length of middle 
cusp, 2inches 2 lines; width at base, 1 inch 6 lines; thickness, 8 lines; width of 
base of crown, including lateral cusps, 2 inches. Nine serratures in 3 lines at middle 
of cutting edge; depth of root, 9 lines. 
Rererence.—(Agassiz), Pois. Foss., vol. 8 = C. angustidens (Ag.) + C. lanceo- 
latus + C. heterodon + C. megalotis + C. auriculatus + C. turgidus + C. semiser- 
ratus + C. Toliapicus. (Dr. Gibbes, Mon. Sq., says Agassiz agrees now to unite 
these species.) 
The gigantic sharks constituting the genus Carcharodon are 
extremely abundant in the Miocene Tertiary, but are almost 
extinct, only one species living at present. They are easily 
[8] 
