108 THE GENERAL ANATOMY OF THE TARSII [SECT. A 



with the sheath of the M. rectus abdominis (which is traceable 

 beneath it as far as the third rib) and the M. obliquus externus 

 abdominis. Otherwise the disposition of the pectoral mass 

 resembles that noted in the Lemur. 



The M. latissimus dorsi has no scapular component ; it is 

 greatly attenuated at its origin, merging aponeurotically with 

 the deep fascia over the longitudinal muscles, among which the 

 M. spinalis dorsi cannot be recognized. The M. dorsi-epitrochlearis 

 arises by muscle-fibres from the muscular (not the tendinous) part 

 of the M. latissimus, and its lower attachment (to the olecranon) 

 is distinct. 



5. The M. biceps humeri has the two normal heads, and of 

 these the so-called coracoid head is closely related to the M. coraco- 

 brachialis. The latter muscle is twofold with a superficial portion 

 extending far down the humerus, and a shorter deeper part 

 inserted beneath or behind the M. latissimus dorsi. No lacertus 

 fibrosus was seen in my specimen. 



6. The M. flexor longus pollicis is almost independent of the 

 M. flexor profundus digitorum, but (as in the Lemur) it receives 

 a stout band of muscle-fibres from the epicondylar part of the 

 M. flexor sublimis digitorum. The pollex is provided with a 

 M. abductor longus and a M. extensor longus, but no M. extensor 

 brevis. Herein Tarsius resembles the Lemur exactly. There is 

 a well-developed "deep" extensor muscle for the digits 3, 4, 

 and 5. 



7. The Diaphragm is thin and the central tendon is neither 

 extensive nor conspicuous. The crura are very distinct from the 

 curved portion of the muscle. Arcuate ligaments are scarcely 

 recognizable, but over the region of the external arcuate band an 

 extensive hiatus of non-muscular tissue is found (as in Man) 

 behind the kidney. The nerve (phrenic) appears to be distributed 

 mainly on the thoracic aspect of the Diaphragm. 



8. The M. gluteus maximus resembles in its origin that of 

 the Lemur. Its extension down the femoral shaft beyond the 

 mid-point of the femur is remarkable. The M. adductor magnus 

 extends to a similar distance, but not to the internal condyle, 

 while the other adductors together with the M. psoas and M. 



