26 



ANATOMY OF VERTEBRATES. 



humerus, closely resembles the transverse connecting fasciculus 

 in the Mole. 



The muscle answering to * levator scapula?,' b, rises from the 

 paroccipital, as well as from the cervical diapophyses : it ex- 

 pands to be inserted into the fore and upper angle of the scapula 



10 



Muscles of pectoral fin, Dclphinus. 



and the fascia covering the ( infraspinatus : ' it is a protractor, or 

 forward rotator, of the scapula. The ( rhomboideus,' a, is the 

 raiser of the blade-bone. Two strong muscles attached to the 

 paroccipital and mastoid, pass, one, e 9 to the sternum (sterno- 

 mastoideus), the other to the humeral tuberosity (sterno-hume- 

 ralis). The 'latissimus dorsi,'/*, is short and slender, coming off 

 by a few digitations from the ribs, and inserted into the humerus 

 and by an extended aponeurosis into the olecranon. The ' supra- 

 spinatus ' is small : it is covered by the * deltoid,' t. The ( infra- 

 spinatus,' c, is a broad and thin sheet of muscle. Behind it is a 

 ' teres major,' k, also of broad and flat form ; and a thick and 

 narrow ' teres minor,' /. The ( serratus magnus' does not extend 

 forward beyond the ribs of the dorsal vertebras. 



In the Ungulate series the muscular system has been traced 

 out in both Perisso- and Artio-dactyle species, but most com- 

 pletely in the Horse, figs. 11-13. In this sensitive quadruped the 

 dermal muscles are well developed, enabling it to shake the 



