M A MM ALIA PACIIYDERMATA. 271 



true coclilear foramen, leading into the tympanic cavity, is here completely 

 wanting. 



Not less distinguished than the article upon the Mammoth is that worked 

 out by Owen in the same work, p. 271, upon Mastodon angustidens. He 

 herein proves that M. avernensis and lonyirostris are identical with angmti- 

 dens. The Professor has also given the news in the 'Aim. of Nat. Hist.' 



o 



xiv, p. 268, of a Mastodon australis that has been found in New Holland. 



The new species is dependent for its foundation only upon a single infe- 

 rior molar tooth, which comes nearest to that of M. augustidens, but still 

 presents several points of difference. Owen takes this opportunity of cor- 

 recting an error which he had formerly committed, namely, that the molar 

 fragment, occurring in common with a large fossil femur, does not belong 

 to the Dinotherium, but is to be referred, on comparison with more perfect 

 specimens, to his Diprotodon, a gigantic marsupial animal. Of this 

 genus, as well as another, called Nototherium, he will shortly treat more in 

 detail. 



C. Ranzani has given three beautiful plates, accompanied by some ob- 

 servations, of the lower jaw found by J. Montius, at the commencement of 

 the preceding century, at Bologna, and ascribed by Cuvier to the Rhi- 

 noceros tichorimts. (Novi Commentarii Acad. scieutiar. Iiistit. Bouoniensis, 

 vi, 1844, p. 295.) 



Tapirus helveticus has been found, according to H. von Meyer's determi- 

 nation, in the peat of the Molasse Von Greit am Hohen Rohnen. (Jahrb. 

 f. Min. S. 566). 



The same author (ibid. S. 298) sets up, under the name Anchitherimn, a 

 new primo-mundane genus related to the Rhinoceros, Anoplotherium, and 

 Palseotherium. The remains belonging to it were found in Madrid, and 

 are indicated by the specific name of A. Ezquerra. 



Morton has surmised the propriety of a second species of River Horse 

 being distinguished as Hippopotamus minor. (Proceed of the Acad. Nat. Sc. 

 of Philad. 1844, p. 185, and Ann. of Nat. Hist, xiv, p. 75.) His conjec- 

 ture rests supported upon two crania which he had obtained from Monrovia, 

 in West Africa, and of River Horses from the River St. Paul. The one 

 cranium is that of a very aged individual, on which the sutures are perfectly 

 obsolete, and the teeth worn down by use ; added to this, its length, from 

 the anterior border to the notch between the articular condylcs of the occi- 

 pital bones, amounts only to 12, 3". Besides this, the cranial roof is uni- 

 formly arched from one orbitar cavity to the other, as wen as between the 

 occipital and the nasal bones, while in the usual species the orbits are strik- 

 ingly elevated, and their intervening space hollowed out. The orbits are, 

 moreover, placed in H. minor in the middle, between occiput and muzzle, 

 while in the large species they are about a third from the former. Finally, 

 the H. minor has only two incisor teeth in lower jaw, the false molars are 



