485 



7. M. omo-hyoideus, . 0*03 oz. 



Origin ; from the anterior point of vertebral edge of scapula. Inser- 

 tion ; usual. 



8. M. subclavius, 0*01 oz. 



Origin ; from sternal end of first rib. Insertion ; under surface of 



outer third of clavicle, and front of acromion. 



E. — Muscles of Shoulder Joint (Opossum). 

 1. M. latissimus dorsi, 0-23 oz. 



Origin; from the spines of (7 — 13) dorsal vertebrae, and from lum- 

 bar vertebrae by fascia. Insertion ; beneath biceps by a tendon distinct 

 from that of teres major ; this tendon also gives origin to a fourth head 

 of triceps, which is inserted into tip of olecranon and fascia of back 

 of forearm. 



JS".B. — There is also an accessory cutaneous lat. dorsi, elliptical in 

 shape, near the inner margin of, and inside, the true latissimus dorsi; 

 its inner border reaches to the pectoralis minor. This muscle weighed 

 0-09 oz., and was inserted into the pectoral ridge of humerus, by 

 fascia, and in line with insertion of pectoralis minor. 



2. M. subscapular is, 0-14 oz. 



3. M. pectoralis minor (long slip), 0*08 oz. 



4. M. pectoralis major, 0'28 oz. 



5. M. coracobrachial, 0-01 oz. 



6. M. deltoideus, . • 0-13 oz. 



Origin ; from the outer third of clavicle, acromion, and whole 



spine of scapula. Insertion ; into the inner side of the pectoral 

 ridge, outside biceps. 



7. M. supraspinatus, , 0*14 oz. 



8. M. infraspinatus, 0-10 oz. 



9. M. teres major, 0*08 oz. 



F. — Muscles of the Elbow. 



1. M. triceps extensor cubiti, 0*42 oz. 



The fourth slip from lat. dorsi weighs 0'02 oz. 



2. M. anconeus, . 0*01 oz. 



3. M. biceps cubiti, . , . 0*09 oz. 



This muscle is double, as in the Kangaroos — 



1. C or aco -radial, . . . 0*06 oz. 



2. Ulno-scapular, . > . 0-03 oz. 



4. M. brachiceus (externus), 0*06 oz. 



From upper and outer surface of humerus, outside deltoid ridge. 



E. I. A. PEOC. — VOL. IX. 3 S 



