6 
head and neck the panniculus is inseparable from or replaced by 
the somewhat extensive cervico-auricularis described below. 
A well-marked “ischiotergal” slip is attached posteriorly to 
the outer aspect of the ischium near its tuberosity, and passes 
forwards to be inserted into the skin of the back in the lumbar 
region. I find no record of such a specialised slip in any other 
marsupial, nor is it present as such in the monotremes. It is 
absent in Zalpa. I have named it “eschiotergal” after an appar- 
enly similar slip described by Macalister* in Tatusza. 
The comparatively meagre development of the panniculus stratum in 
Notoryctes is worthy of remark. In its degree of development and 
differentiation it is slight, slighter than is usual amongst marsupials, 
and far inferior to the corresponding stratum in monotremes and 
insectivores, in which an extensive development of the sheet is found, 
e.g., in Ornithorhynchus or in Talpa or Chirysochloris—animals which are 
just as destitute of special dermal movable structures. 
Some of the Hdentata, e.g., most Armadilloes, have well-developed 
skin muscles, but in others, and especially in Chlamydophorus, the sheet 
is only feebly developed, and not well differentiated. 
M. cervico-auricularis (figs. 1, 4, and 5 7.a.) is a well marked 
sheet of muscle, extending from the mesio-dorsal line of the head 
and neck outwards to the distal end of the long tubular auditory 
meatus, into the dorsal aspect of which it is inserted, its anterior 
fibres mingling with those of the special attrahens aurem (figs. 2 
and 3q). Its anterior border reaches the parietal and frontal _ 
regions, whence its fibres are directed backwards and outwards, 
converging to the meatus. Anteriorly it is closely related to the 
integument of the scalp, while its transverse posterior border 
behind the occiput is free. 
It overlaps the whole of the cleido-trapezius and delto-trapezius 
elements of the subjacent sheet. Many of its fibres have an 
almost antero-posterior direction, and a decussation of these with 
the transverse fibres is observable. : 
M. attrahens aurem seu mandibulo-awricularis, a narrow, rib- 
bon-like muscle (figs. 2 and 3a.a.), arising from the lateral as- 
pect of the ascending ramus of the mandible, just behind the 
insertion of the temporal muscle, by a narrow tendinous origin, 
which is overlapped by the hinder border of the masseter. Its 
fibres are directed outwards and dorsally, parallel with, and close 
- in front of, the tubular auditory meatus, to the distal extremity 
of which some of its fibres are inserted, the remainder decussating 
and mingling with the fibres of the cervico-auricularis. 
Cervico-auricularis seems to be the representative of conjoint attol- 
lens and retrahens aurem muscles, at least, and part of it corresponds 
to the auriculo-occipitalis of Ruge. 
* Xxvii., page 227. 
