66 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
ered by the supra-coracoideus ; it inserts on the head of the humerus 
between the coraco-brachialis longus and the coraco-radialis proprius. 
The supra-coracoideus , very similar to the supra-scapularis, is a 
fan-shaped sheet arising from the ventral part of the outer surface 
of the coracoid, except the ventral and anterior borders. Its inser¬ 
tion on the head of the humerus is covered by the pectoralis. 
The coraco-radialis proprius, seeming almost like a thin and 
tendinous continuation of the procoraco-humeralis, takes its origin 
from the posterior edge of the coracoid on a line continuous with 
the main axis of the procoracoid. It inserts on the head of the 
radius with the humero-antibrachialis inferior. 
The procoraco-humeralis is a thin narrow band covering the pro- 
coracoid, and arising from the anterior border of its outer surface. 
It inserts dorsally to the supra-coracoideus on the head of the 
humerus. 
The humero-antibrachialis inferior , a slender spindle-shaped 
muscle, acting with coraco-radialis proprius as the flexor of the fore 
limb, arises from the ventral side of the lateral process of the 
humerus and inserts on the inner surface of the head of the radius. 
The anconeus is the chief extensor of the fore limb and has sev¬ 
eral parts, all long and slender muscles, arising separately and unit¬ 
ing to insert on the olecranon. Their origins are as follows : — 
Anconeus coracoideus from the posterior border of the coracoid 
near the glenoid fossa. 
Anconeus scapidaris medius from the postero-ventral edge of the 
scapula. 
Anconeus humeralis lateralis from the lateral process of the 
humerus, dorsal to the humero-antibrachialis inferior. 
I was unable to find anconeus humeralis medius in Typhlomolge 
and it also seemed to be absent in Proteus. In both animals the 
limb muscles are delicate, as there is little weight to be supported, 
and probably this fourth head has disappeared or is included in the 
anconeus humeralis lateralis. 
Muscles of the Hind Limb. 
Ventral Surface. 
Outer layer. — The semitendinosus (pubo-ischio-tibialis) is a 
thick, broad, superficial sheet arising from the posterior half of the 
