24 
Transactions Texas Academy of Science. — 1906. 
humeri. Origin in Aeronautes (Cor.-br. p., PI. VI., figs. 51, 56) 
is on the posterior lateral half of the coracoid, its dorsal surface, 
and from neighboring border of the sternum. It inserts on the distal 
end of the apex tuberculi medialis humeri. 
4. M. coraco-brachialis anterior. Origin in Geococcyx (Cor.-b. a., 
PI. II., figs. 16, 17) is fleshy on the lateral border of the anterior 
end of the coracoid. It inserts also fleshily on the ventral surface 
of the humerus, reaching the crista lateralis. Origin in Bubo (Cor.- 
br. a., PI. IV., fig. 30) is semitendinous on the lateral surface of 
the anterior end of the coracoid. It inserts fleshily on the lateral 
border and ventral surface of its humerus, not only reaching the 
crista lateralis, but sending a slender extension down the humeral 
shaft beside the M. pars humero-cubitalis for one-fourth the length 
of the humerus. Origin in Aeronautes (Cor.-br. a., PI. VI., figs. 
55, 56) is semitendinous on the lateral surface of the anterior end 
of the coracoid. It inserts on the lateral border of the humerus and 
on the ventral surface extending down to the base of the insertion 
of M. pars thoracica. 
b. Other trunk muscles inserting on wing, scapula and cora- 
coid. 
1. M. deltoideus major. Origin in Geococcyx (Del., PI. II., figs. 
14, 15, 16, 17, 19) is semitendinous on the dorso-median border, 
and on less than the proximal fourth of the dorsal surface of the 
scapula, extending even to the anterior end of the same and on the 
dorsal surface entering the foramen triosseum. It inserts on the os 
humero-scapulare, entire dorsal surface of the humeral head, and 
on the crista lateralis, terminating on the lateral surface of the 
humerus two-thirds of its length from the head. Origin in Bubo 
(Del., PI. III., figs. 26, 28; PI. IV., fig. 33) is on the anterior dorsal 
surface of the scapula not quite reaching the extremity, but extends 
to the dorso-median border and into the foramen triosseum. It in- 
serts on the os humero-scapulare, dorsal surface of the crista later- 
alis, and down to the mid point of the lateral surface of the hum- 
erus. Origin in Aeronautes (Del., PI. VI., figs. 52, 56), is on the 
dorso-median border of the anterior end of the scapula, scapular 
facing border of the coracoid, and dorsal extremity of the clavicle. 
It inserts fleshily on the processus supra-condyloideus lateralis of 
the humerus. 
2. M. deltoideus minor. Origin in Geococcyx (Del. m., PI. II., 
fig. 17) is on the coracoid facing surface of the anterior end of the 
scapula, ligamentum coraco-scapulare dorsale. The fibers on its lower 
surface are fused to those of the M. deltoideus major lying under 
it, but the muscle lies mainly in front of the M. deltoideus major. 
