453 
Genus, Thylacinus. 
Thylachm. 1 . Temminck, Monographies de Mammalogie, tom. i. p. 60^ 
1827. 
Peracyon 2 . Gray, Annals of Philosophy, for November, 1825, vol. x. 
of New Series, p. 344. 
Dasyurida with the outermost incisors slightly exceeding the 
others in size; the premolars separated from each other, 
and — in number ; the three foremost of the upper true 
3 — 3 
molars with a much elevated central cusp, an anterior and 
posterior cusp but little elevated, and an internal lobe; the 
hindcrmost upper true molar transverse; the true molars of 
the lower jaw nearly resembling those of the upper jaw, but 
destitute of internal lobe, and with the central cusp more 
elevated ; the humerus with the inner condyle perforated; 
the hind foot destitute of inner toe ; marsupial bones 
wanting ; the females with a distinct pouch, and provided 
with four mammae. 
The premolars are more numerous in Thylacinus than in 
Dasyurus , there being three, instead of two, of these teeth on 
either side of each jaw: the teeth, indeed, agree in number 
with those of Phascogale, though in other respects they 
differ much: the incisors differ, inasmuch as the outermost, 
instead of the innermost pair, are the largest; the premolars 
differ in being isolated, and the true molars are of a more 
simple form. The canine teeth are of large size, of a simple, 
elongated conical form, and are slightly recurved at the apex; 
those of the upper jaw are separated from the incisor teeth by a 
1 From dv\aKos, a pouch. 
2 From pera, a pouch ; and kvcou, a dog(?) Although Mr. Gray proposed 
the above name for the present genus in 1825, so far as I can learn the section 
was first characterized by M. Tennmuck. 
