6 A Review of the Muscles used 
ing a few tendinous fibres over it to be inserted into the 
pollex phalanx. By following the directions given above, 
this muscle and its tendon can be easily brought into view 
in the wing of any passerine bird, as well as in the majority 
of others. 
9. The tensor patagii brevis is a muscle that has been so 
well and clearly described by Garrod (Coll. Sci. Mem., p 356) 
that I willreproduce hig original description here. He says : 
“Tn the triangular patagium of the wing of the bird the 
tendons of two muscles are to be found. One is that 
of the tensor patagii longus, which forms the supporting 
cord of the free margin of the membrane itself. The second 
is that of the tensor patagit brevis, which courses parallel 
with the humerus, not distant from that bone, to the 
muscles and fasciz of the forearm (See Figs. 1-3 and 5-6 of 
the present paper, tp. b.) Inthe Ramphastine, Capitonine, 
and Picine, where this muscle is less complicated than in 
any other birds, it arises, as is generally the case, from the 
apex of the upper of the two processes at the scapular 
extremity of the furcula, as well as by a small special slip 
from the superficial fibres of the pectoralis major muscle, 
which differentiates itself off from the main muscle near 
the upper part of its inserted extremity. The comparative- 
ly insignificant triangular or compound fieshy belly thus 
formed, with its apex directed towards the elbow, termi- 
natesin a cylindricaltendon, which, included between the 
layers of the fibro-cutaneous patagium, takes a straight, 
course to its insertion into the axially-running tendon of 
the origin of the extensor metacarpi radialis longus of 
Schopss [e. m. r. 1. in the figures here given], at a short dis- 
tance from the tubercle on the humerus whence the muscle 
springs.” 
‘As a result of this disposition, when the fore-arm is 
half-flexed, the tendon of the tensor patagiz brevis is seen 
to enter the substance of the fibrous origin of the extensor 
metacarpt radialis longus, and at right angles. This 
arrangement is indicated in plate 21 [of his work], and is 
characteristic of the Picariz, as defined by myself to include 
the three sub-families above referred to, and them only,” 
