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Number of Nipples.
Pouch.
I. Family, Didelphyid^.
Genus, Marmosa —
1
(a) grisea
19
Absent.
(b) pusilla
11-15
(c) murina
9-15
1
(d) oiiierea
9-11
j '
Genus, Peramys —
1 j>
(a) henseli
17-25
1
(6) tristriata
19
1
(c) americana
15
1
(d) domestica
13
(e) sorex
13
{/) brevicaudata
9-11
"
Genus, Caluromys —
(a) philander
5-7
Only lateral folds.
(4) lanigera
5-7
Genus, Metachirus—
" *'
(a) crassicaudatus
I]
Absent or feebly
(b) nudioaudatus
developed.
(c) opossum
7
Well developed.
Gen US; -Didelphys —
(a) marsupialis
5-13
Genus, Chironectes —
[a) minimus
17
II. Family, Dasyueid^.
'Genus, Phascologale —
(a) penioillata
10
Feebly developed.
gj
(b) flavipes
8-10
.5
(c) ininutissima
8-10
Well developed.
3 •
Genus, Smi-nihopsis —
^
cd
(a) crassioaudata
10
'I } >
o
(b) murina
S
Genus, Dasyurus
6-(8)*
)»
.Genus, Sarcophilus
4
' ' ))
Genus, Thylacimcs
4
Genus, Myrmecobius
4
,, n
III. Family, Peeamelid^
{6)-8t
J, J,
IV. Family, Pbalangemd^e
(2)-4t
>> ))
V. Family, PHASOOLArxTiDiE ...
2
>j J)
VI. Family, Maoeopodid.e
4
>j )>
Eight nipples in D. hallncatus alone ; other species regularly with
six nipples only.
t Thomas mentions in P. cockerelli and Imigwaudahis only six nipples ; all other Peramelidae, so far as known, with eight nipples.
J The normal number of nipples is four, but single specimens of the genera Trichosurus, Distachurus, and Petaurus, show sometimes only two nipples.
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