62 
In Talpa* the flexor mass forms one single unsegmented muscle, 
from which comes a strong tendon; but in Evinaceus* all the factors 
are present. In Chrysochlorist the flexor sublimis is very small, and 
passes only to the second finger. In the latter form the flexor profun-— 
dus has a large ossification in 1t which reaches to the carpus. 
The sublimis and profundus are generally well differentiated in this 
order. 
Among the Rodentia Windle} notes that the flexor sublimis is nearly 
always a somewhat deeply placed muscle owing to its being overlapped 
by the large palmaris longus and flexor carpi ulnaris. According to 
the same author, the sublimis is reduced to a minimum in the Car- 
wivora, existing nearly always merely as “an offshoot from the condylo- 
ulnaris near the lower end of the forearm.”’ In this respect the Car- 
nivora would seem to resemble the Marsupialia. 
It would appear from Mivart’s and Murie’s account of the anatomy 
of Dasyprocta§ that a flexor brevis mantis exists as a small superficial 
muscular mass superficial to the flexor tendons, and arising from their 
surface, in addition to a long flexor sublimis. It had an apparent at- 
tachment or insertion into the proximal end of the fifth digit. In the 
right limb the long flexor sublimis gave tendons to the second, third, 
and fourth digits; on the ieft side to the fifth as well. It is probable 
that this flexor brevis mantis is simply a short accessory portion of the 
flexor sublimis corresponding closely to that found in the Civet (v. 
supra, p. 61). The condition in the Guinea-pig would also seem to be 
similar, according to Humphry,|; though Mivart and Murie state that 
they failed to detect a corresponding structure in that animal. 
IntTRINsSIC MUSCULATURE OF THE MANUS. 
Three muscles only are present, viz. 
M. abductor pollicis, 
WW. flexor brevis pollicis, and 
M. flexor brevis indicis. 
M. abductor pollicis (brevis) (figs. 6, 7, 10, 12, 13, 14, and 15, 
ab.p.). This muscle is contained in the prominent fold of naked 
‘skin which corresponds to the ball of the thumb, and which near 
its proximal part or base is in close relation to the projection of 
the rudimentary fifth digit.4] 
It is a small but fairly thick quadrate muscle which arises 
from the aponeurosis of the manus near the wrist at a point cor- 
responding to the anterior annular ligament (which is not very 
specially developed). It is inserted into the (morphologicaily) 
preaxial or radial manubrium** which juts out from the proximal 
phalanx of the pollex. 
M. flecor brevis pollicis (figs. 13 and 14, f-b.p.) consists of two 
small flattened muscular bands arising together from the base of 
the metacarpal of the third digit. They are inserted into oppo- 
* Ixviili,, page 76. + xxvi. » page 824. + Ixviil., page 77. § xl., page 402. 
||xx., page 176, Note. 7 Figs. 2 nt be 13, 14,°15, and Ay 2.7 xx Fig. 15, 
sep, Nee 
