07! I'UOKJiSSOll OWEN ON THE MABSUPIAI POUCHES, MA .M.MARY GLANDS, 
of the ventral integument, when a pouch or inverted Cold of precisely similar shape, 
depth, and dimensions appeared, but with the opening turned the opposite way; the 
folds were closer and less conspicuous on that side, the cavity of the pouch being flatter 
(see Section. Plate XL. fig. whence 1 inferred that the more open pouch (ih. section, 
fig, 2, r) had been the scat or nest of the very small and probably recently-boEO animal, 
Whoso position there, as in the figure, Plate XXXIX. a, had naturally led the original 
captor of the Echidna to conclude that it was hanging by a nipple. 
No such projection, however, presented itself in any part of the inner surface of either 
pOlldJ ; hut at the fundus of each was an u " areola" or elliptic surface, about four lines 
in diameter (Plate XI,. fig, 4), on which, with (he pocket tens, COnld be discerned the 
Orifices of about, fifty ducts of a gland, The canals or roots of tine scattered hail's and 
Several minute white papilla 1 (//v. fig. 6,jp, /v, magn.), about one or two lines apart, on 
winch opened sebaceous follicles, were all the appearances characterizing the otherwise 
smooth and even surface of these inflexions of the abdominal integument. 
'I he contrast which this pouch presents with that of a true marsupial quadruped con- 
taining I lie mammary foetus* is great ; for even in the uniparous species, r. (/,, the larger 
Kangaroos, two, if not (bur, Long slender nipples axe conspicuous, to one of which the 
foetus hangs, closely embracing the pendulous extremity of the nipple by its small, round, 
terminal, t ubulax moul h. 
My next step was to test, the statement in reference to the number and condition of 
t he tnammar) glands, 
I found, as LI! a former dissection of a younger unimpregnatcd female Echidna*}*, that 
these glands Were tWO in number, forming, like the pouches, a symmetrical pair (Plate 
XL fig. I). Bach gland (<(, d) was of a, flattened, subelliptic form; the left (a) being 
I inch LOj lines, the right (V) I inch 8i lines in long diameter, the left. I inch 6 lines, 
the right I inch 8 lines in short diameter across the middle, and both glands about 5 
line:; in thickness ;it the middle pari (figs. 2, 8). Each gland consists of about 1(10 long, 
BarrOW, flattened lobes, obtusely rounded at their free ends, and beginning, at about half- 
way towards the Opposite side, to contract gradually to the duct which penet rat es t he 
corium (Plate XI,. figs. 2 & 8, &), to terminate on the mammary areola (ih. o) at the fun- 
dus of ihc pouch. Prom the small size of the areola compared with that of the gland, 
the lobules have a convergent arrangement thereto, each terminating in its own duct, 
Without blending with the substance of a contiguous lobe; and, as a general rule, with- 
out anastomosis of Contiguous. ducts to form a common ( anal. Bach gland is enclosed 
in a loose capsule of cellular tissue (lig. I, c, r) and lies between a thick M panniculus car- 
nosus" (figs. 1, 2, -'I, r/, d% adherent to the abdominal integument (//) and the "obli- 
qUUS e\ tennis abdominis " muscle, on a plane exterior or lateral " to the pouch. The 
glands had UOl been exposed or disturbed by any dissection in the preliminarv examina- 
* For tic lignifloation of this term ms "On the OmTati.m of ihe M orsupiAl Animals," Ruloiwphica] Tnms- 
BOttoai| vol. rxxiv. p. 388, 
t °<>n the M unmary Glandi tff th« QmtthtrhyHchui," rial. Trans., torn, cit, ]». .">;t7, PL XVII. figs. 8 ft :t. 
