110 The Alligator and Its Allies 
radiale and with a thin tendon to the metacarpal 
bone of the thumb. Rudinger was not able to 
find this muscle in Alligator cynocephalus. 
Carpo-phalangei (Plate II., Fig. 1, 4) (Flexor 
digitorum communis brevis, Oberflachlicher ge- 
meinschaftlicher Fingerbeuger, Fléchisseur sub- 
lime, Flexores sublimis a profundo perforati, Lange 
Flexoren der Finger, Flexor digitorum communis 
sublimis s. brevis, Flexor digitorum sublimis). 
A small thick muscle. It springs from the liga- 
mentum carpi-volare proprium and from the ulnar 
border of the distal end of the os carpi-radiale and 
is divided into eight muscle-bellies which pass 
over to the proximal ends of the first phalanges as 
thin tendons that are penetrated by those of the 
humero-ulno-phalangei muscle. 
Humero-ulno-phalanget (Plate II., Figs. 1 and 
2, 5) (Flexor digitorum communis profundus, 
Fléchisseur profond, Tiefer gemeinschaftlicher 
Fingerbeuger, Flexor digitorum profundus, Flexor 
profundus). Arises with three heads. The first 
head takes its origin from the internal condyle of 
the humerus, runs between the humero-radialis 
lateralis muscles, and passes as a tendon over 
to the carpus where it unites with the other two 
heads of this muscle. The second, deep head 
comes from almost the entire length of the ulna. 
These two heads may be called the long heads. 
The third, short head springs from the proximal 
ends of the two large carpal bones of the first row, 
