248 
PROFESSOR OWEN ON TEETH OF A LARGE EXTINCT GENUS. 
It seems strange that the indications of an extinct species so conspicuous as must 
have been the living Sceparnodon Ramsciyi, obtained from localities so remote from 
each other and showing a wide geographical range, should be restricted to a front 
incisor, seemingly of the upper jaw. Yet the first indication of the large Carnivore 
( Thylacoleo ) was a solitary carnassial; * and that of the huge herbivorous Diprotodon, 
was but a fragment of a front lower incisor. + I am in hopes, therefore, of being 
favoured by analogous opportunities of communicating to the Royal Society a 
restoration, through successive contributions, of the skeleton and dentition of the 
present singular, most probably Marsupial, Rodent-like, extinct, Australian Mammal. 
Description of the Plate. 
PLATE 11. 
Sceparnodon Ramsayi, Owen. 
Fig. 1. Side or edge view of portion of an incisor tooth. 
Fig. 2. Outer or convex side of the same. 
Fig. 3. Inner, or concave, side of the same. 
Fig. 3 a. Cross-section of the same. 
Fig. 4. Side or edge view of the cast of a larger portion of an incisor. 
Fig. 5. Inner or concave side of the same cast ; showing, a, the abraded surface; b, 
the indent above that surface. 
Fig. 5a. Cross section of the same. 
Fig. 6. Side or edge view of the cast of a still larger portion of an incisor. 
Fig. 7. Inner, or concave, side of the same cast; showing, a, the abraded surface; 
b, the indent; r, median ridge. 
Fig. 8. Portion of the outer surface, fig. 7', showing the fine lineation of the cement- 
clad enamel. 
(All the figures, save 9, are of the natural size.) 
* Mitchell’s ‘ Three Expeditions into the Interior of Eastern Australia, 8vo., 1838, vol. ii., 
Appendix, p. 359, plate 32, figs. 10, 11. 
t lb. ib., p. 362, plate 51, figs. 1 and 2. 
