fod 
( 
Not unlikely, it also represents other cervical and cephalic portions 
of the panniculus, i.e., elements of the “subcutaneus colli”’ layer of 
the “ superficial brachio-cephalic stratum ” of Humphry*. 
In Myrmecobius Lechet describes two layers of auriculo-occipitalis 
fibres, of which the deeper were directed forwards from the ligamentum 
nuchae towards the anterior basal part of the ear, and partly to the 
upper orbital border, while the more superficial fibres passed directly 
outwards from the mid-occipital line to unite with the other fibres in 
the auricle. 
In Phascogale the same observer describes an auriculo-occipitalis 
consisting of several slips, of which the anterior passed forwards into 
the frontal region beneath the auricularis superior, while three slips 
passed transversely outwards to the auricle. 
It may be that the hinder part of the M. auricularis superior of this 
animaif is represented by part of the anterior fibres of the cervico- 
auricularis of Notoryctes. 
Attrahens (mandibulo - aumicularis) present in both the above 
animals.§$ 
In Koala|| Macalister found a thin and wide attollens and a strong 
bilaminar retrahens, which came from the occipital protuberance. He 
also found two attrahens slips, neither of which, however, corresponds 
to the mandibulo-auricularis of Notoryctes. 
In Ornithorhynchus the ear muscles are not fully differentiated from 
the cephalic prolongation of the panniculus.1 
In Chlamydophorus Macalister** found the ear muscles exceedingly 
feeble, the attollens and retrahens being hardly represented, while in 
Tatusia the same author found both well developed. The attrahens in 
the former animal was also feebly devoloped, and arose from the 
zygomatic arch. 
Humphry found in Orycteropustt a large retrahens, continuous with 
an attollens, all the fibres converging to the ear, and an attrahens 
arising by three origins, of which the first exactly corresponds to the 
origin from the mandible in Notoryctes. 
Auricular muscles in the Insectivora are well developed in accord- 
ance with the great specialisation of the subcutaneous muscles 
generally. Bothin Chrysochloris and the Talpidae{t they include occi- 
pito-cuticularis and cervico-auricularis sheets, both of which are in- 
serted into the auricle; and a cervico-cuticularis may also in part 
(Gymnura ) possess a similar attachment. 
That muscular system or stratum of fibres which in man is 
represented by the trapezius and sterno-cleido-mastoid muscles, 
with occasional intermediate slips, consists, according to Macalis- 
ter,S§ of the following elements :—“ Trapezius, acromio-trachelien, 
cleido-occipital, clerdo-mastoid, sterno-mastoid, &c.” 
Only the trapezial and sterno-mastoid portions are with cer- 
tainty present in Wotoryctes, but the trapezial system of fibres 
*xx., page 133. +t xxvi., page 674. txxvi., page 678, and Taf. xcviii., 
fig. 2. §xxvi., page 683, and Taf. xcviii., fig. 2. || xxvill., page 128. 
‘lxxxvit, Tab. vi. ** xxvil/, page 229° {}xxi., page 295. {7 xxvi., 
pages 663 and 679. §§xxvii., page 238. 
