32 
Transactions Texas Academy of Science. — 1906. 
condyle of the ulna. From this point there comes off a tendon which 
bends back around the external condyle of the humerus and inserts 
on the processus supracondyloideus lateralis of the humerus. Origin 
in Aeronautes (Pars. sc. cub., PI. VI., figs. 52, 54) is semitendinous 
on the neck of the scapula, and outer glenoid border. In inserts by 
a short, strong tendon on the proximal rim of the external condyle 
of the ulna. 
b. Pars lnimero-cubitalis. In Geococcyx (Pars. hu. cub., PI. II., figs. 
14, 20) the short head comes from the distal four-fifths of the median 
surface of the humerus. The other part, divided at its origin by 
the insertion of the m. scapuli-humeralis posterior, comes from the 
crista meclialis of the humerus and. from the margin of the foramen 
pneumaticum. The parts soon unite and run down to insert by a 
tendon and a strong aponeurosis on the olecranon process of the 
ulna, and on the intervening space between it and the external 
condyle. In Bubo (Pars. hu. cub., PI. III., fig. 28; PI. IV., figs. 
33, 37) one part comes from the median surface of the humerus, and 
the other, divided at its origin by the insertion of the m. scapuli- 
humeralis posterior, comes from the crista medialis of the humerus 
and from within the foramen pneumaticum. Insertion is by tendon 
and a strong aponemosis on the olecranon process of the ulna and 
the intervening space between it and the external condyle. In 
Aeronautes (Pars. hu. cub., PI. VI., fig. 54) one part comes from 
the median surface of the humerus, and the other, divided at its 
origin by the m. scapuli humeralis posterior, from the crista medialis 
of the humerus, and from the rim of the foramen pneumaticum. Its 
insertion is by a tendon and an aponeurosis on the olecranon process 
of the ulna and the external condyle. 
During the preparation of the present paper errors in my study 
on Phalaenoptilus were discovered. The corrections are given below. 
The muscle named M. deltoideus major anterior is the m. del- 
toideus minor. M. rhomboideus superficialis inserts on the anterior 
four-fifths of the dorso-median border of the scapula. M. rhom- 
boideus profundus has a tendinous origin on the last cervical and 
the following dorsal vertebrae, and also from the anterior edge of 
the ilium. M. scapuli-humeralis posterior inserts within the border 
of the tuberculum mediale of the humerus, near, but not within 
the foramen pneumaticum. M. subscapularis arises from the lateral 
and median surfaces of the scapula. It inserts by a short tendon 
on the apex tuberculi medialis humeri anterior to the insertion of 
the m. coraco-brachialis posterior. M. serratus superficialis posterior 
arises in four scallops from the four sternal ribs. There is a fleshy 
insertion of a part of the muscle on the posterior tip of the scapula, 
