MUSCLES OF THE TRUNK. 19 
The levator anguli scapulae takes origin from the transverse processes of the 
three last cervical vertebrae and is inserted along the subscapular surface of 
the scapula, internal to the rhomboideus, from the coraco-vertebral 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, f) 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 oblique muscles present no especial peculiarities. The ectobliquus 
arises from the pubie 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 midventral line. It passes 
as a thin sheet antero-ventrally to the median line and ventral border of the ribs. 
The rectus abdominis originates as a partly tendinous thin sheet from the 
ventral third of the first rib. It passes back to unite just behind the xiphi- 
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 mm. each side of 
the symphysis. 
As in Gymnura, Centetes, and Potamogale there is a clavicular portion to 
the ectopectoralis. 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 
