1895.] NEW YORK ACADEMY OF SCIENCES. 259 
2. The second case, recently observed, which presents points 
of especial interest in connection with the subject of this paper, 
exhibits one of the important relations between Biceps and 
Brachialis anticus, and emphasizes the significance of the semi- 
lunar fascia, as representing the remains of an ulnar bicipital 
division which has lost its skeletal attachment, in accordance 
with the functional specialization of the muscle as the main 
supinator of the limb. 
9, Ireland, aet. 54. March 15, 1895. 
Plate XLVII. Right upper extremity : 
This case affords a well-marked example of the original con- 
nection between Biceps and Brachialis anticus. 
The origin of the Biceps in this arm is normal,as is the ar- 
rangement of Coraco-brachialis. A strong muscular bundle 
separates from Brachialis anticus a short distance below the 
Coraco brachial insertion. The outer and larger portion of this 
muscle joins the deep surface of the Biceps and passes with it 
to the radial insertion. The inner part continues downward 
and inward, gives off a narrow tendon which passes with the 
remainder of Brachialis anticus to the coronoid process, and 
then expands into the semilunar fascia, which is well developed, 
crossing obliquely over the brachial artery. 
The additional muscle in this instance is evidently an Internal 
Brachio-ulnar muscle, which, however, presents not only the 
usual connection with the radius by means of the bicipital 
junction, but preserves its original ulnar insertion both by the 
tendon slip to the coronoid process and by the development of 
the entire semilunar fascia. The significence of the latter 
structure, entitling it to be considered as the distal portion of 
an ulnar bicipital segment which has lost its skeletal attachment, 
is strongly emphasized by the arrangement of the aberrant 
muscle in this subject. 
STATED MEETING. 
May 20th, 1895. 
The Academy met with Vice-President Stevenson in the chair ; 
ten persons present. The minutes of the last meeting were read 
and approved. The Secretary presented the nomination of Mr. 
Edward Gould, Dobbs Ferry, for resident membership, and it 
was referred to the Council. The Secretary read by title the 
