40 
The muscle, so far as I know, presents nothing worthy of note 
amongst the Carnivora.* 
M. anconeus internus, seu epitrochleo-anconeus (figs. 6 and 7, 
an. 1.). This forms a short, moderately thick, and somewhat 
rounded muscle, arising dorsad of the internal (ulnar) epicondyle 
(epitrochlea), and directed backwards to the concave aspect of 
the curved and beak-like olecranon, into which it is inserted not 
far from the tip. The fibres of the muscle are in series with 
those of the inner head of the triceps proximally. At its distal 
border there is a triangular intermuscular interval, bounded 
distally by the epitrochlear and olecranon heads of the M. flexor 
carpi ulnaris (figs. 6 and 7, f.c.w.), and proximally, of course, by 
the anconeus internus itself. [I found no trace of a fibrous arch 
uniting the two heads of the flexor carpi ulnaris, to which the 
distal border of the anconeus internus is attached in various 
other marsupials (Cuscus, Dasyurus ).* | 
As usual, the ulnar nerve passes down into the forearm under 
cover of the muscle. 
The anconeus internus has been described in all Marsupials whose 
myology is recorded, and its character and relations seem much the 
same in all.t 
It is figured, as well as described, in Dasywrus viverrinus by Wenzel 
Gruber in his monograph upon this muscle§ ; c.f. also MacCormick.|| 
Figures of the muscle also appear in Cuvier and Laurillard (Macropus 
major),{1 and in Galton’s paper on the muscle (Phascolomys),** as well 
as in Cunningham’s Memoir}++ (Cuscus). 
The muscle is also well developed in the Monotremes. It is described 
and figured in Echidna by Westling.t+ Mivart has not recognised it as 
a distinct muscular element, but Galton has both described and figured 
it on this genus.§$$ 
In Ornithorhynchus the muscle has been described by Wood, |||| though 
Meckel does not refer to it, nor do Cuvier & Laurillard figure it. I 
find it a well-developed muscle in dissections by Dr. McKay, and 
Coues?{1 also notes it as a muscle of considerable size (his “ Antan- 
coneus’’). 
The nerve supply in Echidna is stated by Westling*** to be from the 
N. radialis profundus. In all other cases the nerve has been found to 
come from the ulnar nerve; even in Ornithorhynchus. Dr. W. J.S. 
McKay has informed me that he can corroborate the statement in 
reference to Ornithorhynchus, and with regard to Echidna, he finds that 
the nerve comes from the “nervus radialis profundus,” as Westling 
states, but that in one case it came off from that nerve along with an 
ansal branch of communication between the ulnar nerve and the 
“‘nervus radialis profundus.” 
* Cf. vi. tiv., page 12, and xxxvi., page 122. tiv., page 13, gives 
various references. § lix., page 17, and PI. ii., fig. 1. || xxxvi., page 122, and 
figs. 2,6, and 8. vi., Pl. 195, fig. lw. ** xvii., fig. 3. ttiv., Pl. i, 
fig. 4. tt lxii., page 22, and Taf. iv., fig. 12 H.a. §§xvii., fig. 4. _ |jl| lxix., 
page 497. ‘ili, page 150. *** lxii., page 22. 
