MUSCLES OF THE TRUNK. 19 



The levator cuiguli scapulae takes origin from the transverse processes of the 

 three Last cervical vertebrae and is insertetl along the subscapular surface of 

 tlie scapula, internal to the rhomboideus, from the coraco-vertcbral angle to the 

 insertion of the serratus magnus. In Centetes as in Gymnura and Potamogale 

 this muscle is united with serratus magnus. In Myogale, however, the condition 

 is practically the same as here described for Solenodon, though in the former the 

 levator is slightly more developed. 



MUSCLES OF THE TRUNK. 



The latissimus dorsi (Plate 4, fig. 1, /) is a large superficial muscle, con- 

 sisting of a thin sheet of fibers covering the dorsal half of the thorax from the 

 last rib forward to about the ninth rib. It arises from the spines of these verte- 

 brae as well. Antero-laterally it becomes a narrow tendon which inserts on the 

 antero-internal face of the humerus near its head, ental to the insertion of the 

 teres and just above it. At the antero-ventral edge, just before the muscle 

 passes into the tendon it is connected by a raphe with the epitrochlearis and by a 

 few strong fibers to the ventral edge of the teres. This peculiarity was noted by 

 Dobson in the Cuban Solenodon. Along the ventral edge of the latissimus 

 where it covers the thorax, a branch from each of the dorsal nerves takes exit. 



The serratus magnus has the usual general origin from the anterior portion 

 of the thorax. Its posterior extension reaches the ninth rib. The muscle is 

 inserted along the posterior inner edge of the scapula at the gleno-vertebral angle. 



The oblicjue muscles present no especial peculiarities. The ectobliquus 

 arises from the pubic symphysis on either side and passes upward and forward 

 on to about the lower half of the ribs to the ventral border of serratus magnus, and 

 the front of the ilium. The entobliquus has a strong tendinous origin from the 

 anterior end of the ilium and along the pubis to the mitlventral line. It passes 

 as a thin sheet antero-ventrally to the median line and ventral border of the ribs. 



The rectus abdouunis originates as a partly tendinous thin sheet from the 

 ventral thirtl of the first rib. It jiasses back to unite just behind the xijihi- 

 sternum with its fellow of the opposite side, and the two are inserted by muscular 

 fibers on the anterior rim of the pubis for a distance of about 8 nun. each side of 

 the symphysis. 



As in Gymnura, Centetes, and Potamogale there is a clavicular portion to 

 the ectopectorcdis. The sternal portion of this muscle takes origin along the 

 entire median length of the sternum from the tip of the manubrium to the base 



