COMPENDIUM OF GENERIC DISTINCTIONS. 



647 



Teeth. 



Genus. — Erinaceus. 



.!. t* P. ==* M. ?=? = 36. 

 3-3 3—3 3—3 



Head. — Muzzle rather elongated. 

 Limbs. — Feet with five toes. 



Body. — Thickly covered with sharp quills or spines above, and 

 with quills and hair below ; capable of contraction into a ball. 

 Tail.— Short. 

 Habitat. — Europe, Asia, and Africa. 



Genus. — Centetes. 



Teeth.— I. — , C. — , P. — , M. — = 38. Sometimes 

 3—3 1—1 3-3' 3—3 



I. . Canines large, round, and conical, separated from other 



3—3 

 teeth by vacant space. 



Head. — Muzzle elongated — Ears short and rounded. 



Body.— Covered on upper surface with mixed spines and bristles. 



Tail.— None. 



Habitat. — Madagascar. 



Family. — M acropid^;. 



Sub-family. — Phala ngistina. 



Skin of flanks developed into a parachute-like expansion, and 

 affixed to the fore and hinder limbs. Hind-feet with five toes, 

 the thumb opposable to the others, and without a claw, the two 

 next joined together as far as the claws. 



Genus. — Acrobates. 



Teeth.- 1. —. ■ C. — , P. — , M. — = 36. The true 

 1—1 1—1 3—3 3—3 



molars furnished each with four acute cusps, premolars large 



and sharp pointed. 



Hairs of tail stiff, and set in double row like the barbs of a 



feather. 



Genus. — Petaurua. 



Teeth.-!. »=» C. ^, P. *=?, M. "*=± = 40. 

 1—1 1—1 3—3 4-^1 



Tail hairy, but not prehensile, and extremely long. 



Genus. — Petaurista. 



Teeth. — Space between the molars and incisors occupied by two 

 6—6 

 -5" 



molars, and are furnished each with four pyramidical cusps, except 

 the last tooth in the upper jaw, which only bears three cusps. 



rudimentary minute teeth. M. 



The four last are true 



Genus. — Cuscus. 



Teeth, as in Phalangista. 



Tail. — Prehensile, destitute of hair except at the base, and cov- 

 ered with small tubercles. 



Genus. — Phalangista. 



Teeth. — Variable, incisors always , and true molars always 



. Molars, either , , or . Inferior canines very 



4_^ 6—6 7—7 8—8 



small, and close to the incisors. 



Tail. — Prehensile, and colored with hair except at tip, and a 

 naked stripe along the under side of the extremity. 



Ears. — Elongated and triangular. 



Genus. — Phascolarctos. 



3—3 



Teeth.— I. - — , C. — , P. — , M. — = 30. The erowu 

 l_l' 0-0 1— l' 4—4 



of each true molar furnished with four angular pyramidical 



tubercles. 



Toes of fore-feet in two sets, the one comprising the two inner, 

 and the other the three outer toes. 



Tail. — None. 



Teeth.— I. 



38. The two 



Sub-family. — Macropina. 



Hinder feet much longer than those of fore-limbs, furnished 

 with four toes, the 'two inner toes being small, and connected 

 together as far as the small claws. 



Teeth. — Six incisors above, two below, lying nearly horizontally 

 in the jaw, and projecting. Canines either wanting, or only in 

 upper jaw, very close to the incisors. A considerable space 



5 5 



between the canines and molars, which are . The front 



5—5 



molar has its crown narrow and compressed, but the others are 

 furnished with two transverse tubercles. 

 Tail. — Long, covered with hair, but cannot be curled or twisted. l 



Genus. — Dendrologus. 



5=5,0. °=°, P. t 1 ,M.*=* 

 1—1 0—0 1—1 4-^ 



middle incisors of upper jaw hardly larger than the lateral. 



Feet. — Hinder feet scarcely longer than fore-feet — Claws of 

 fore-feet very strong, curved, and compressed — Fore-feet them- 

 selves larger than ordinary. 



Tail. — Longer than body, powerful, and covered with hair. 



Genus. — Macropus. 



Teeth.— Same as in preceding genus, but the two middle incisors 

 of the upper jaw are equal in length to the other. The outermost 

 on each side being broad. 



Feet. — Hind-feet much longer than fore-feet — Claws, only of 

 fore-feet, strong, curved, and compressed. 



Tail. — Powerful, covered with hair, not so long as body. 



Genus— Halmaturus. 



Teeth. — Two middle incisors of upper jaw longer than the 

 lateral. 



Head. — Rather elongated. Muzzle, uaked. 



Feet. — Hinder far surpassing the fore-feet — Claws of fore-feet, 

 flatfish and strong. 



Tail. — Shorter than the body, and covered with scale-* towards 

 the tip. 



Genus. — Petrogale. 



Teeth. — Canines wanting ; upper incisors equal, but the front 

 rather the longest, and slightly curved inwards ; hinder one 

 hatchet-shaped, dilated towards the edge, and notched in the 

 centre. 



Head. — Muzzle bald. 



Tail. — Cylindrical, furnished with a well-marked tuft at tip. 



Genus. — Bettongia. 



Teeth. — Canines placed near the incisors, the space being about 

 equal to one of the incisor teeth. Foremost compressed molar 

 furnished with many Vertical grooves ; true molars nearly square. 



Head. — Short and broad. 



Genus. — Hypsiprymnus. 



Teeth. — Two middle incisors of upper jaw rather long, the two 

 lateral incisors being small in proportion. 



Feet.— Claws of fore-feet curved and compressed, the three 

 middle claws very much longer than the two outer. 



Tail. — Shorter than body, and slight. 



Genus.— Lagorchestes. 



Teeth. — Foremost upper incisor largest, and hinder the smallest. 

 Behind the incisors, a very small canine. T/he last incisor has one 

 vertical groove. 



Genus. — Phascolomya. 



Teeth.— I. 



: 34. Molars with 



t=l, C.°=5, P. 1 ^, M.*=* = 

 1—1 0—0 1—1 4—4 



A considerable interval between the incisors and the 



flat crowns, 

 molars. 



Feet.— Furnished with five toes, thumb-joint of hinder feet very 

 short, and without a claw. The remaining claws powerful, and 

 used for digging. 



Tail.— Extremely short, only half an inch in length. 



