17 
the scapular head of the triceps, and it seems partially adherent 
to the postaxial border of that muscle. 
In no other marsupial whose myology is recorded is the humeral 
insertion lacking, and in all there is a distinct dorso-epitrochlearis 
present. 
The extent of the vertebral attachment varies much amongst marsu- 
pials, and a costal origin is absent in many e.g., Didelphys,* Dasyurus,t 
and Koala,t &c.; while in Wombat§ it arises from no less than six of 
the lower ribs. In the three forms described by Cunningham|| only 
. the last rib afforded an attachment to the muscle. 
In Echidna Mivart' describes and figures two muscles as representing 
the latissimus. The posterior of these is interesting, as its insertion 
corresponds with that in Notoryctes. It is ‘‘very elongated, and is 
triangular from its origin as far as the elbow. It arises, by digitations, 
from six ribs (namely from the 8th to the 13th), and, becoming nar- 
rower, passes beneath the interior condyle. A little below the middle 
of the forearm it becomes intimately united with the surface of the 
flexor carpi ulnaris.”” The ulnar insertion of the panniculus is figured 
as in close dorsal relation to the latter. The anterior muscle from the 
first eleven dorsal spines is “inserted into the inner condyle of the 
humerus, in union with what appears to be the dorso-epitrochlear.” 
This “ dorso-epitrochlear”’ the author describes as arising from the 
posterior extremity of the vertebral border of the scapula and from 
the tendon of the teres major, and as inserted into the inner condyle 
of the humerus with the second part of the latissimus by a very strong 
tendon. The term “ dorso-epitrochlear”’ as applied to this slip cannot 
be retained, as the fibres in question are undoubtedly only a deep. 
ship of the latissimus. The true dorso-epitrochlear fibres are to be 
sought for amongst the fibres of insertion of the posterior part of the 
latissimus. Westling indeed reckons the latter muscle as simply a 
dorse-epitrochlearis (including “ dorso-antebrachialis’”’ and “ dorso- 
brachialis ” portions).** 
In Ornithorhynchus, Owen,t t following Meckel, describes the latissimus 
as long and broad, arising from all the dorsal and lumbar spines and 
the eleven posterior ribs, and inserted by a broad and strong tendon 
into the distal half of the ulnar margin of the humerus, and, with part 
of the panniculus, into the fascia attached to the olecranon and spread- 
ing over the forearm. At its anterior part the muscle may be divided 
into a superficial and a deep stratum. Here, as in Echidna, the dorso- 
epitrochlear fibres are probably represented by those which descend 
into the forearm and spread out in its fascia. 
In Cuvier & Laurillard’s plates,{{ however, a segmentation is figured 
into an anterior or spinal and a posterior or costal portion, answering 
to Mivart’s similar segments in Echidna. 
In Chlamydophorus$$ the muscle also consists of two parts, but the 
anterior, which arises from hinder dorsal and anterior lumbar vertebre, 
is inserted into the “ posterior inferior angle of the post-scapula.”’ 
This is unrepresented in any other Edentata. The second (posterior) 
* xxix., page 156. txxxvi., page 105. +xxviii., page 129. § xxix., page 
156. ||iv., page 5. “I xxxix, page 380. **Ixii., page 21. +t xlv., page 11. 
+E vi. Pl., 266, 7. andz. 1. §§ xxvii., page 236. 
B 
