268 MR. ST. GEORGE MIVART ON [Apr. 22, 
postsacral. It comes to the surface between the adjacent sides of 
the femoro-caudal and ischio-coccygeal muscles, and is inserted into 
the posterior edge of the semitendinosus a little after the latter muscle 
has left the ischium. 
The ischio-caudal (figs. 7 & 10, I. C) passes forwards beside the 
cloacal aperture, and therefore forms the most median part of the 
subcaudal muscular mass. It springs from the hypapophyses of the 
first four caudal vertebree, and is inserted into the postero-external 
angle of the ischium. 
Femoro-caudal (figs. 7, 8, 9, & 10, F. C). <A rather large muscle 
which I thus name comes out of a sort of muscular sheath on each 
side of the proximal part of the under half of the tail. The sheath 
is formed by the jlio-caudal above, and by the semimembranosus 
below ; and the muscle springs from the sides of the hypapophyses of 
two or three of the anterior caudal vertebrae. It is inserted by a 
strongish tendon into the flexor surface of the femur just below the 
great trochanter, just behind and outside of part of the insertion of 
the adductor. 
Fig. 8. 
Superficial muscles of outer side of hinder part of trunk and anterior part of tail, 
and of the dorsal (extensor) side of right pelvic limb. 
E.S. Erector spine. E.L.D. Extensor longus digitorum. F.C. Femoro- 
caudal. G. Ma. Gluteus maximus. J. Iliacus. J/.c. Tlio-caudal. JZ. P. 
Ilio-peroneal. 2. F. Rectus femoris. S,M@, Semimembranosus. 8. 7. 
Semitendinosus. 
Ilio-caudal (figs. 7, 8, 9, & 10, Il. C). This is that part of the 
infero-lateral caudal muscular mass which is inserted into the posterior 
aspect of the ilium. ‘The insertion is just above the origins of the 
gluteus maximus and biceps. 
Gracilis (figs. 7 & 10, G). A very large sheet of muscle may 
