PHILOSOPHY OF ZOOLOGY. 



and the penis is bifid, to correspond with the two ora tincae. 

 The corpora lutea are glandular. 



With tusks. 



In these, the tusks are long, the incisors small, and the 

 grinders have conical points, the usual characters of in- 

 sectivorous animals. The great toe is without a nail. 



127. DIDELPHIS. Opossum. Incisors, ten above, and 

 eight below. Tail prehensile. The great toe capable of 

 acting as a thumb. The pouch in some of the species is 

 perfect, as D. opossum, while in others, its place is marked 

 by a fold of the skin on each side, as the D. philander. It 

 is probable that the discovery of other characters may in- 

 duce naturalists to divide them into distinct genera. The 

 D. palmata, in which the feet are webbed, constituting the 

 genus Cheronectis of ILIGER, is too little known to admit 

 of classification. 



128. DASYURUS. Incisors, eight above, and six below. 

 Two species, D. cyanocephalus and D. ursinus, are des- 

 cribed and figured by Mr HARRIS in Lin. Trans, ix., 

 p. 174. Tab. xix, 



A. Without tusks. 



129. PHASCOLOMYS. Wombat. Two long incisors in 

 each jaw. Grinders with two transverse ridges on the sum- 

 mit. Herbivorous. Ccecum large, with an ajjpendage. 

 No tail. Ph. ursina. 



First and second toes of the hindrfeet closely united as 

 far as the claws. 



A. With tusks. 



With tusks in both jaws. 



130. PERAMELES. Incisors, ten in the upper jaw, and 

 six in the lower. P. nawtus. 



