174 ON THE ANATOMY OP THE KOALA. 



inches, mi Him. 



Total length, from tip of nose to end of body .... 17-0 432 



Length of eye .............................. 1-0 25 



ear (greatest) ...................... 2-15 55 



head ....................... ..... 4-0 100 



nude muzzle ...................... 1-4 35 



chin ............................ 2-65 67 



Breadth across muzzle ............ .......... 1-0 25 



of mouth .......................... 1-3 33 



Distance between cloaca and mammae .......... 1-25 32 



The tail is a mere stump above the cloaca, which latter is well defined 

 by a well-marked circular marginal fold of the integuments. The hallux 

 has no trace of a nail. The skin is generally flesh-coloured ; but the 

 soles of the manus and pes, together with the naked " muffle," are black. 

 The skin of the large and hairy ears is flesh-coloured. There is a 

 narrow naked ring round the eyes ; and the irides are brown. The 

 pupil is a vertical oval. The nostrils are transversely oblique, the nasal 

 septum measuring 3| millims. The upper lip is split ; but the split does 

 not quite, when the surrounding parts are expanded, reach the nostrils. 

 The skin is sparsely covered with hairs between the rami of the mandible ; 

 for nearly two inches behind it the skin is absolutely naked ; and on the 



182 1 81 ' S ^ es ( runnul S U P t war( ls the angle of the mouth) it is nearly so, a patch 

 of black hairs being developed just behind the mouth on the lower and 

 outer surface of this bare space. 



The marsupial pouch in this young specimen is very imperfectly 

 developed. It appears as a small, oval, nearly naked space, measuring 

 about 0'8 inch both across and antero-posteriorly, with a well-marked 

 bounding-fold of integument on each side; inside which is a smaller, 

 secondary one. The hairs of the surrounding parts more or less radiate 

 from this nude space, which lies between the epipubes (or so-called 

 " marsupial bones "). The skin covering it is pinkish. The teats are 

 two* in number, 15 millims. apart, and are situated at the posterior and 

 inner angles of the bounding-folds ; they are covered by fur. The lips of 

 the pouch, it may be noted, look as much downwards as forwards. 



In an adult $ Koala, 20J inches long, preserved in spirit, the pouch 

 is much better developed its antero-posterior extent being about 1*85 

 inch, whilst the breadth of the aperture is 1*4 inch. It admits (my) 

 three median fingers, and extends widely outwards into the groins, as far 

 as the skin-fold between the knee and trunk. The teats, two in number, 

 are situated behind, on a level with the posterior margin of the pouch's 



* Prof. Owen (Anat. Vert. iii. p. 769) describes Pkascolarctos as having four ["two 

 on each side"] mammary glands. 



