462 MR. ST. GEORGE MIVART ON THE {June 24, 
also goes to the digits, but which takes origin from the distal half 
of the ulna. 
Pelvic Limb. 
Semimembranosus (figs. 8, 9, 10, & 11, S.M). This slender 
muscle springs from the hypapophyses of the caudal vertebrze (the 
first two that are elongated), and passing forwards, enclosed in a 
sheath consisting of the subcaudal muscular mass, joins the posterior 
margin of the gracilis and origin of the semitendinosus. It passes 
along external to the large precloacal glandular mass, and side by 
side with similarly directed and similar-sized femoro-caudal and 
ischio-caudal. 
Fig. 8. 
Superficial muscles of ventral surface of right side. 
A, Adductor. Hx. O. External oblique. F.C. Femoro-caudal. FD. Flexor 
digitorum. #. H. Flexor hallucis. G. Gracilis. Z Iliacus. ZC. Ischio- 
caudal. S. Sartorius. S.J/. Semimembranosus. S. 7. Semitendinosus. 
The ischio-caudal (figs. 8 & 11, I. C) is the most internal of 
the caudal appendicular muscles. It arises from the subcaudal 
muscular mass at the same distance backwards as does the semi- 
membranosus ;_ passing forwards, it is inserted into the postero- 
external angle of the ischium. 
Femoro-caudal (figs. 8, 9,10, & 11, F.C). This muscle is about 
the same size as that last described, and also springs from the 
anterior caudal hypapophyses. It comes out of the sheath formed 
for it and the muscles running parallel with it by the subeaudal 
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