40 CLASS MAMMALIA. 



which and the last, is the presence of two additional inci- 

 sors in the lower jaw, and a molar more above, and one 

 less below on each side. The ears also are larger and more 

 rounded, and the fur in general borders on a reddish yellow. 

 The habitat is the same. 



This is also called Isoodon, from the evenness of the teeth, 

 and is the Porculine Opossum of Shaw, so named from a 

 slight similarity to a pig in miniature. 



We shall now speak of the Phalangers, with which the 

 second grand subdivision of the Marsupiales commences. 

 Their dentary formula will stand thus : — Incisors f , ca- 

 nines ii, or, ■§•§■; false molars or canine ff, or, §§ ; molars 

 ||, or, ff = 38 or 40. 



The two intermediate upper incisors are separated at 

 their base, converge towards their point, and are longer 

 and larger than the others. The exterior ones are smaller. 

 The lower incisors are long, inclining, and nearly horizon- 

 tal, corresponding to the upper by their external edge. The 

 upper canines are sometimes long, conical, curved, and 

 placed immediately after the incisors. Sometimes their 

 place is filled by two small conical teeth very distinct from 

 the incisors, the anterior of which is the largest. Lower 

 canines there are none, their place being supplied by two or 

 three small even teeth, cylindrical, obtuse, and hardly pro- 

 jecting beyond the gum. The molars are sometimes five 

 on each side of the two jaws, the anterior one of which is 

 very strong, conic and obtuse, and the four others almost 

 equal and squared. Sometimes the upper ones are six in 

 number, two of which are false and compressed, and four 

 true, with tubercles. Of the lower ones, five in number, 

 one is false and denticulated, while four are true and tuber- 

 culous. 



The head of these animals is elongated. Frontal ridge 

 slightly arched. Mouth not very deeply cut. The ears are 



