GllEY OPOSSUM. 
505 
as soft as that of the Common Mouse, and on the back of the 
head and upper parts of the body of the same colour as in 
that animal, but the sides of the body are said to be pdter; 
the under side of the lower jaw, and fore part of the anterior 
limbs, nearly white, and the under parts of the body dirty 
white: a narrow dark line on the upper surface of the bead 
separates the pale hue which adjoins the black eye-ring: the 
tail is of the same colour as the upper parts of the body. 
Inches. Lines. 
Length from tip of nose to root of tail ... 3 11 
14 of tail ... ... ... . 5 4 
Th oD.grisea is placed by authors in the pouchless division 
of the Opossums; but I find that Azara merely surmised that 
the animal was destitute of that appendage, and had been 
positively informed by a friend that the female possessed a 
pouch: perhaps it has a rudimentary pouch, like many of the 
species of the second section. Dr. Lund, in his description 
of D. incana , makes no mention of any pale ring encircling 
the black one which surrounds the eye, hut in other respects 
his description agrees very closely with Azara s Micoure a 
queue longue. 
I will here notice a small species of Opossum contained 
in the British Museum collection, which will perhaps prove 
distinct from either of the species briefly characterised by 
Dr. Wagner, and which appears to me to be undoubtedly 
distinct from either of the Opossums more fully described by 
M. Temminck, in his Monograph upon the group. 
Didelphyn 
Fur very soft, long and loose ; general colour of the upper parts 
ashy grey, of the under parts white, faintly tinted with 
