1891.] 



DOLICHOTIS PATAGONICA. 



239 



Some of the Muscles. 



In dissecting the muscles of Dolichotis I have confined myself to 

 those of the limbs and for the most part to the flexors and extensors 

 of the limbs. 



I commence by describing those muscles which I have dissected, 

 and shall presently point out the resemblauces to other Rodents. 



Muscles of the Fore Ltmb. 



The Trapezius is a very extensive muscle, its origin extends back 

 as far as the last rib ; it is continuous in front with a strongly 

 tendinous fascia which passes into a thick layer of muscle, forming 

 thus an almost separate anterior portion of the muscle. The hinder 



Fiff. 3. 



Arm muscles of Dolichotis patagonica. 



Pect., pectoralis primus; C.B., coraco-brachialis ; Bi., biceps; Brack, ant., 

 brachialis anticus ; Tri., triceps ; Lat. Dor., latissimus dorsi ; B. ep., 

 dorso-epitrochlear ; H., humerus; Teres May'., teres major; w, second 

 part of brachialis anticus. 



part of the trapezius is attached to about the middle of the spine of 

 the scapula ; this insertion is continuous with that of the anterior part 

 of the muscle, which is to the metacromion and by fascia on to outer 

 muscles of humerus ; this insertion is partly covered by that of the 

 panniculus carnosus. 



The Latissimus dorsi is not attached to the infraspinatus, as it 

 is stated to be in the Agouti by Messrs. Murie and Mivart ; its 



