42 PROCEEDINGS OP THE ACADEMY OF [1897. 



and are concealed by the upper margin of the Pectoralis major. The 

 clavicular sheet makes up the bulk of the muscle and constitutes 

 the superficial fascicle. The sternal sheet is thicker than the fore- 

 going and constitutes the deep fascicle. The Splenitis lies in part 

 between the two fascicles. The extent of the insertion of the mus- 

 cles, namely, along the entire length of the occipital ridge (linea 

 semicircularis ossis occipitis of Burmeister) is noteworthy. The 

 Trapezius sends a slip to the posterior border of the foregoing sheet 

 at a point answering nearly to the level of the axis. Burmeister 

 gives two distinct origins with a triangular interval between them. 

 No mention is made of the clavicular and sternal fascicles being 

 united at the median border of the muscle. 



The Trapezius is without a capitate slip. The upper fascicle, con- 

 fined to the cervical region, is small and inconspicuous. The mid- 

 dle fascicle is continuous with the foregoing and ends abruptly 

 about on the line of the inferior end of the vertebral border. 



The Splenius is a broad simple sheet. It sends a small fleshy slip 

 to a superior angle of the scapula and a broad tendinous slip to the 

 Scalenus anticus. 



The Transversalis colli can be traced to the junction of the super- 

 ficial and deeper parts. The deep fascicle merges with the above 

 near the insertion ; both fascicles are beautifully delineated in Bur- 

 meister's plate. The terms in which the Pedoralis major are defined 

 present a scheme as simple as any found elsewhere in the mammals. 

 It is of interest, therefore, to find two parts, a superficial and a deep 

 part present, and also to note that the muscle can not be separated 

 absolutely from the Transversalis colli and the Deltoideus without 

 artificial dissection. 



The Pectoralis major is small and composed of two fascicles. The 

 sheet is not folded. The superficial fascicle consists of an upper and 

 lower congeries of fibres, which are distinguished by their trend 

 rather than by relation. The fibres of insertion are continuous in- 

 ferioriy with the Deltoideus. 



The Transversalis collis is traceable to the under surface of the 

 Pectoralis major. This is in harmony with the plan seen in Felis 

 The Serratus magnus is directly continuous with the Transversalis 

 colli, and demonstrates in a satisfactory manner that these two mus- 

 cles form parts of the same sheet. 



The Deltoideus acts at the insertion of the outer (acromial) fasci- 

 cle as a muscle of union between the Pectoralis major and the Brack- 



