522 MANUAL OF ZOOLOGY SECT. 



of Ornithorhynchus. The eyes are small, and there is no 

 auditory pinna. The tail is vestigial. 



Of the Marsupialia, the Opossums (Didelphyidcz) (Fig. 291) 

 are arboreal rat-like Marsupials, with an elongated naked 

 muzzle, well-developed, though nailless, opposable hallux, 

 and an elongated prehensile tail. The Dasyuridce (Australian 

 Native Cat (Fig. 292) Tasmanian Devil, Thylacine, etc.) 



FIG. 291. Virginian Opossum (Didelphys virginiana.) (After Vogt and Specht.) 



have the pollex often rudimentary, the foot four-toed, the 

 hallux, when present, small and clawless, and the tail not 

 prehensile. 



The Bandicoots (Perameltdce) are burrowing Marsupials, 

 the size of which varies from that of a large Rat to that of 

 a Rabbit. They have an elongated pointed muzzle, and, in 

 some cases, large auditory pinnae. The first and fifth digits 

 of the fore-feet are vestigial or absent, the remaining three 



