814 MR. J. B. PERRIN ON BALEZNOPTERA ROSTRATA. [ Dec. 6, 
The teres major was not inseparably connected at its origin with 
the serratus magnus, but arose independently of it. It extended 
almost the whole length of the postaxial border of the scapula. 
The muscle, prior to its insertion, was joined along its upper border 
by a fascial process from the capsular ligament (ventral surface) 
(fig. 2, Pé). 
The teres minor was absent. 
The subscapularis (fig. 2, Sb. Sep.) presented more of the character 
of the muscle (described by Carte and Macalister) of the Globioce- 
phalus svineval. It was very large, occupying the whole of the sub- 
scapular fossa. Its surface was traversed by seven tendinous inter- 
sections, which divided the muscle into eight nearly equal-sized fleshy 
slips. Its tendon of insertion was broad and moderately thick ; its 
deeper portion was inserted into the neck of the ventral surface of 
the humerus, immediately below the head of that bone. Its super- 
ficial fibres were prolonged across the ventral surface of the humerus, 
forming a dense investment to it, on to the bones of the forearm, — 
along which it was further continued, previously acting as the ante- 
rior connecting ligament, along with other tendinous expansions 
(viz. those of the pectoral and masto-humeral, which it joined), to 
the humero-cubital articulation. 
The coraco-brachialis (fig. 2, C. B.).—This muscle presented no 
differences in origin from that described by Carte and Macalister. 
But its insertion differed materially from that found by them, both 
in the Balenoptera and Globiocephalus. Its tendon of insertion, 
opposite the upper border of the distal attachment of the latissimus 
dorsi and teres major, divided into two tendons. The anterior tendon 
passed along the ventral aspect of the insertion of the latissimus as 
far as its lower border, where it terminated, being partly inserted into 
the humerus and partly joining the tendinous expansion of the masto- 
humeral. The posterior tendon passed behind the insertions of the 
latissimus dorsi and teres major, giving off a slip of attachment 
to the humerus immediately behind the upper part of the insertion 
of the latter muscle; the remainder of the tendon was prolonged 
downwards and backwards, spreading gradually out into an expan- 
sion three quarters of an inch wide, which joined the external head 
of the triceps to be inserted along with that muscle. The distal 
division of this muscle may be regarded as a tendency towards the 
formation of a second coraco-brachialis, as occasionally found in 
the human subject; and its passing behind the latissimus favours 
this view materially. 
Lxtensor communis digitorum (fig. 1, Ext. Com. Digt.) arose, by a 
strong flat tendon, from the dorsal surface of the distal extremity of 
the humerus, immediately above the articulation. It passed down 
in the interval between the radius and ulna, lying in the interosseous 
space, in which situation it received additional fibres of attachment. 
It was crossed on its dorsal aspect by a strong fibrous band, and by 
its ventral aspect lay in contact with an imperfect interosseous mem- 
brane, thus being situated, as it were, in a membranous or aponeu- 
rotic tunnel, About three inches above the lower end of the radius 
