356 TRANSACTIONS OF THE [oCT. 4, 



lateral two-thirds of the ventral border of the clavicle, and is 

 intimately connected with the clavicular portion of the Ectopec- 

 toral, this connection becoming still more marked at the inser- 

 tion into the humerus. 



The acromial division (PL XXXII,, fig. 2, D^) forms a strong 

 conical bundle, covered b}^ an aponeurotic lamella, arising from 

 the acromial end of the clavicle, along the ventral concave border, 

 and from the adjacent portion of the acromion process. It is 

 separable from the clavicular portion at the origin, and widely 

 .separated from the division arising from the scapular spine, from 

 the origin to just before the common insertion of all three 

 portions into the lateral humeral crest. 



The portion arising from the spine of the scapula ( PI. XXXII., 

 fig. 2, D^) is attached to the caudal surface of the spine, along its 

 entire length ; man}^ fibres are also derived from the infraspinatus 

 fascia. The muscle crosses obliquely over the long head of the 

 Triceps and the Brachialis anticus to reach the dorsal margin of 

 the common tendon of insertion. 



According to the account given b^^ Murie and Mivart (1 , p. 28) 

 the presence of three divisions of the Deltoid has been noted in 

 Lemur catla and L. varius, as well as in the other species of 

 Lemur examined by the authors ; also in Galago crassicaudatus, 

 the lines of separation being less distinct in G. allenii. 



Meckel (op. cit. Vol. VI., p. 258) describes the Deltoid as 

 single in Loris, and Murie and Mivart (1, p. 28) found it so in 

 Nycticehus tardigradus. 



Van der Hoeven does not describe the muscle in his anatomy 

 of the Potto, and in the figure of the shoulder muscles '(PI. II., fig. 

 11) indicates but a slight tendency to a division of the Deltoid. 



Burmeister (6, p. 49, tab. 3, fig. 1, No. 15) describes the Deltoid 

 in Tarsius as composed of two parts. Murie and Mivart find 

 three divisions present in Cheiromys. 



8. Brachial Muscles. 

 A. M. Biceps (PI. XXIX.-XXXIII. inch). 



Arises by two heads : 



1. Goracoidhead (PI. XXX., fig. 2, and PI, XXXI, fig. 2): 

 Origin from medial or ventral portion of tip of Coracoid pro- 

 cess, combined with the Coracobrachialis. 



2. Glenoid head (PI. XXX., fig. 2, and PL XXXI., fig. 2) : 

 Origin from margin of glenoid angle of scapula, just in front of 

 articular facet. 



The long tendon of the glenoid head describes a sharp 

 bend at nearly right angles over the capsule and head of the 

 liumerus, confined in the upper part of the intertubercular 



