The genus _Thylacinus_ contains but a single species, which is now limited to Tasmania, and is generally known as the Tasmanian Wolf. It has the build of an ordinary Wolf, and is of about the same size. The hinder part of the body is marked with a series of black transverse bands. The hallux is entirely wanting; the pouch opens backwards. The marsupial bones are minute and unossified. The dental formula is I 4/3 C 1/1 Pm 3/3 M 4/4 = 46. There are four mammae. This animal, now confined to Tasmania, {151} is getting rarer on account of its sheep-killing propensities, and the consequent war of extermination declared upon it by the colonists. It will, however, feed upon other animals; and it is related that the first specimen ever captured had in its stomach the remains of an Echidna! Mr. Thomas thinks that the persistence of this and of some of the other larger carnivorous Marsupials in Tasmania after their extinction in Australia is not unconnected with the advent of the Dingo. But it is stated that the Thylacine is quite capable of keeping even a pack of dogs at bay. [Illustration] FIG. 79.--Tasmanian Devil. _Sarcophilus ursinus._ x 1/10. The genus _Sarcophilus_ has been frequently confounded with the next, but it is kept apart by Mr. Thomas, who follows Cuvier in this. An alternative generic name is _Diabolus_, which, like the first name, refers to the habits and character of the single species which this genus contains. The genus is more like _Thylacinus_ than is _Dasyurus_. The hallux is wanting, and the teeth, though fewer in number (42), resemble those of the Thylacine more closely than do those of the Dasyure. The species is called _S. ursinus_, the popular name being Tasmanian Devil. It is black with a variable number of white patches on the body. It is of about the size of a Badger, and is, like the Thylacine, a nocturnal animal. The Tasmanian Devil is said to be one of the most ferocious of animals, and to express its ferocity by a "yelling growl." {152} [Illustration] FIG. 80.--Skull of _Dasyurus_. (Lateral view.) _al.sph_, Alisphenoid; _ang_, angular process of mandible; _fr_, frontal; _ju_, jugal; _lcr_, lachrymal; _max_, maxilla; _nas_, nasal; _oc.cond_, occipital condyle; _par_, parietal; _par.oc_, paroccipital process; _p.max_, premaxilla; _s.oc_, supraoccipital; _sq_, squamosal; _sq_', zygomatic process of squamosal. (From Parker and Haswell's _Zoology_.) [Illustration] FIG. 81.--Dasyure. _Dasyurus viverrinus_. x 1/5. (After Vogt and Specht.)