Bi 
aponeurosis; this he regards as the separated clavicular trapezius. 
This muscle was inseparately joined to the rest of the trapezius in 
mine,” &c. The last described portion of the trapezius would appear 
to correspond to the cleido-trapezius of Notoryctes. 
The insertion of the anterior trapezius in Chlamydophorus and 
Tatusia is into the scapular spine and acromion. 
VW. rhomboideus (figs. 1 and 4, rh.) is a single, very extensive, 
and thick muscular sheet. It arises in part from the crista occi- 
pitalis under cover of the cleido- and delto trapezius, but it ex- 
tends further ventro-laterally than they do. It also takes origin 
from the whole of the ligamentum nuche under cover of delto- 
and acromio-trapezius fibres, and from the first two dorsal spines 
where it is uncovered by any other muscle. Its posterior border 
is parallel and in apposition with the anterior border of the 
latissimus dorsi. The fibres of the muscle have a somewhat com- 
plicated arrangement. The posterior ones run directly outwards, 
to be inserted into the vertebral or mesial border of the scapula, 
The fibres next succeeding (anteriorly) incline slightly backwards, 
whilst those from the cephalic end of the ligamentum nuche, 
together with the whoie of the occipital fibres, sweep almost 
directly backwards. Of the backwardly-directed fibres, those 
more dorsally placed are inserted into the vertebral border of the 
scapula, but less into its mesial edge than into the outer surface, 
or dorso-lateral lip; whilst the more ventrally placed, occipital, 
fibres are inserted into the preaxial lip of the scapular spine 
under cover of the acromio-trapezius. (See fig. 4.) 
The rhomboideus muscular stratum in Wotoryctes plainly con- 
tains elements of all three portions recognised in certain other 
forms, 2.e., Mm. rhomboideus capitis, rhomboideus major, and 
rhomb. minor. 
For a list of synonyms for the rhomb. capitis reference may be 
made to Leche’s Memoir in Bronn’s Thier-reich* 
The rhomboid sheet in Notoryctes differs from that described in other 
marsupials, e.g., by Cunningham,* chiefly in the much greater extent 
of its insertion, which has usurped the whole length of the preaxial 
lip of the mesoscapular spine. This fact, together with the entire 
absence of an acromio-trachelien muscle, leads me to suppose that the 
latter muscle has been absorbed into the rhomboideus, or, rather, has 
not been segmented off from it. But there is no atloid origin of part 
of the sheet to indicate such a compound character. 
In Cuscus, Phascoyale, and Thylacinet,in Koalat,and in Wombat§ the 
rhomboid is undivided and extensive, arising from occipital crest as 
well as from cervical and dorsal spines, and in all is inserted into the 
whole length of the base of the scapula; and in each of these animals 
an acromio-trachelien is present attached, in Wombat, to ‘ outer half 
of scapular spine,” and in Koala, to “one-half of scapular spine.’’ 
*xxvi., page 725. tiv., page 3. txxviii., page 129. § xxix., page 154. 
