5D 
with it they limit a small triangular interval, at the bottom of 
which the ulnar nerve may be found. 
The muscle is relatively a very powerful one. As has already 
been mentioned, it is covered by a strong aponeurosis, which 
forms the continuation of the tendon of insertion of the M. latis- 
simus dorsi. 
The arrangement of this muscle in Notoryctes is practically identical 
with that found by Cunningham in Thylacinus and Phascogale,* and is 
fairly typical of marsupials generally. In the three forms examined 
by the last-named author the insertion was into the pisiform in each 
case; so also is the case in Sarcophilus} and Dasywrus.t In Phasco- 
lomys+ it is inserted into the fifth metacarpal, and in Phascolarctos$ 
into both the above-mentioned bones‘as well as into the os hamatum. 
In Chironectes into pisiform and fifth metacarpal. || 
In Macropus}+ the condylar origin is lacking. 
In Echidna the muscle is “ enormously wide’? (Mivart{]), arising not 
only from entocondyle and olecranon, but also from the inner border 
of the ulnar shaft as far as the wrist. Mivart states that its tendinous 
surface “receives the tendon of the first part of the latissimus dorsi ; 
and the two muscles becoming thus ultimately united, are together in- 
serted into the pisiform bone.’’ Westling, however, distinguishes this 
“first part of latissimus’’ from the rest as a “ dorso-antebrachialis,’** the 
latissimus dorsi itself being arrested at the entocondyle. As I have 
indicated above (p. 16), this “ dorso-antebrachialis’’ is inseparable from 
the latissimus in Notoryctes, and indeed forms the only insertion of 
the muscle, cf. also Cones’ description in Ornithorhynchus.7 t 
The flexor carpi ulnaris in Ornithorhynchus resembles that in Kchidna. 
The fibres of its strong tendon are completely arrested at the pisiform 
bone; it is only quite indirectly that it has an attachment to the 
bases of the fourth and fifth metacarpals, as Meckel describes it ;{} 
hence Leche is mistaken in classifying its insertion with others as 
deviating from the typical mode.$$ 
Amongst the Hdentata the muscle varies considerably in different 
forms, froma slender separate muscle with two scarcely separate heads, 
inserted into pisiform in Chlamydophorus, to an enormous mass of 
four segments, condylo-pisiform, posterior ulno-pisiform, anterior 
ulna-pisiform, and olecrano-pisiform in Cyclothurus. 
No special features require note in the other orders reviewed. 
M. flexor carpi radialis (figs. 6, 7, 11, 12, 14, 15). This 
muscle arises from the entocondyle close to the entocondylar head 
of origin of the M. flexor carpi ulnaris.: 
It forms a broad fleshy belly on the flexor aspect of the fore- 
arm, which suddenly narrows a little above the wrist and forms a 
rounded tendon, which passes through a canal in the “scapho- 
carpal” (fig. 10, for.fe.r.). In this bony canal the tendon divides 
*iv., page 18, + xxix., page 163. {xxxvi., page 131. § lxxii., page 230. 
. || liii., page 9. 4] xxxix., page 388. ** Ixii., page 23, and Taf. iv., fig. 12. 
Tt iii., page 147. tt xxxvii., page 28. §§ xxvi., page 827. 
