108 The Alligator and Its Allies 
dylus externus humeri and is inserted on the outer 
side of the entire length of the radius. 
Humero-radialis Brevis (Plate II., Fig. 4, d) 
(Supinator brevis, Kurze Ruckwartswender, Ex- 
tensor carpi-radialis brevis [?]). Arises near the 
preceding from the external condyle of the humerus 
and is inserted at the upper end of the radius. 
Humero-carpi-radialis (Plate II., Fig. 2, a) 
(Aeusserer oder langer Speichenmuskel, Musculus 
quem parti superiori extensoris digitorum com- 
munis respondere videbat, Extensor carpi-radialis 
longus, Abductor pollicis longus). Towards the 
ulna, near the supinator longus muscle. It springs 
from the external condyle of the humerus, covers 
the supinator brevis muscle, and is inserted on the 
proximal end of the carpi-radialis. 
Humero-carpi-ulnaris (Plate II., Fig. 2, ©) 
(Extensor carpi-ulnaris, Ulnaris externus). Origi- 
nates on the external condyle of the humerus, is 
inserted on the proximal end of the os carpi-ulnare. 
Humero-metacarpalis III., IV., V. (Plate II., 
Fig. 2, 0) (Extensor digitorum longus, Aeusserer 
Speichenmuskel or Speichenstrecker der Hand, 
Extenseur commun, Extensor radialis longus, 
Extensor digitorum communis). This muscle lies 
between the humero-carpi-radialis and the humero- 
carpi-ulnaris muscles. It springs from the con- 
dylus externus humeri and divides, on reaching 
the carpus, into three thin, flat tendons, which in 
part fuse with the carpo-phalangei muscle, and in 
