a7 
The chief part of the tendon is really inserted into the trapezium and 
the scapho-lunar, distal to the radial sesamoid. 
The descriptions just given differ somewhat from those given by 
other observers,* though on the whole I can corroborate the account 
given by Westling of the arrangement of the muscle in Echidna. 
The radial sesamoid in Ornithorhynchus is very firmly attached to the 
palmar aspect of the scapho-lunar, but I could find no indication what- 
aver of any special continuation of the tendon of the flexor carpi 
radialis to the base of the second metacarpal, such as is alleged to exist 
in Meckel’s descriptions. ¢ 
In Chlamydophorus, Cyclothurus, and Tatusiat this muscle is small, 
and is inserted into the metacarpal of the pollex only; into third, 
second, and first metacarpals in Pholidotus ;{ into the index meta- 
carpal, with the intervention of a radial sesamoid bone, in Orycteropus,$ 
and into the carpus only in Dasypus (os multangulum) || and Choloepus 
(scaphoid and os multangulum). { 
In Dasyprocta (and in Hare, Rabbit, and Guineapig){ the muscle is 
entocondylar in origin, but is inserted into the base of the first phalanx 
of the index. But in rodents in general Meckel speaks of it as arranged 
as usual,** and Leche gives the index metacarpal as the insertion in the 
Rabbit.++ 
Amongst the Insectivora it arises in Chrysochloris, not only from the 
entocondyle, but, from the proximal third of the ossified tendon of the 
flexor profundus digitorum. It is then inserted into the index meta- 
carpal, as also in Hrinaceus. tt 
Amongst Carnivora the muscle is inserted usually into the index 
metacarpal, but may be also into the first or third, e.g., dog. 
As already stated, there is no M. palmaris longus present in 
Notoryctes, and the MW. flexor sublimis digitorum being also 
absent, there is only one long digital flexor present forming the 
representative of the M. flexor profundus digitorum (+ flexor 
longus pollicis) of other forms. 
M. flexor digitorum (figs. 12-15 f.dig.) consists of a muscular 
mass imperfectly segmented into four portions. 
Following Windle’s classification §§ of the constituents of the 
deep flexor mass, we may here distinguish representatives of 
(a) condylo-ulnaris, (b) condylo-radialis, (c) ulnaris proprius, (d) 
radialis proprius. 1 found no trace of a centralis element. 
All the parts of the muscle are attached to the large palmar 
sesamoid bone (figs 13-15 p.ses.). See also Stirling’s description. | || 
From the distal portion of this bone the tendons of insertion 
proceed. 
Condylo-ulnaris and condylo-radialis (f.dig. 1 and 2 in figures) 
arise side by side from the slight pit-like depression on the distal 
* xxxvii., page 27; iii., page 152; xxxix., page 388 ; and Ixii., page 25. 
{ xxxvil., page 27, and xxxvill., page 543, { xxvii., page 250. § xv., page 
584. || xiv., page 544. I xl., page 400. ** xxxvii., page 544. ft xxvi., 
page 821. +t xxvi.. page 822. §§ Ixviii., page 73. ||| liv., page 177, and 
Pl. viii., fig. 5. 
