362 TRANSACTIONS OF THE [MAY 24, 



I. Thoracic Muscular Group. 



The ai-rangement of the Thoracic muscles resembles closely 

 the t_ypical conditions found in some of the lower mammalia, 

 notably the plantigrade carnivora, e. g., Taxidea americana. 

 Among the more characteristic mjological features the follow- 

 ing can be cited : 



1. Thoracic extension of the Rectus abdominis to the first rib. 



2. Thoracic extension of the Scalenus group, and interdigita- 

 tion of the same with the External oblique and Serratus an- 

 terior. 



3. Position of Brachial Plexus, ventrad of Scalenus group. 



4. Supracostal muscle, superficial to and crossing cephalic 

 portion of Rictus obliquel3^ 



5. Continuity of Levator scapulfe and Serratus anterior. 

 The type which all these muscles exhibit in Lemur bruyieus is 



distinctly that of the usual carnivore arrangement of the same 

 myological group. 



II. Appendicular Muscular Group. 



Is in the main distinctly' Primate in character. 



Especially marked, and in i)art apparently peculiarly well de- 

 veloped in this respect in the species described, are the fol- 

 lowing : 



A. Pectoral origin: 



1. Ectopectoral arising in its abdominal portion by a distinct 

 line of origin from the aponeurosis of the External oblique. 



2. Partial origin of the Ectopectoral from the costal cartilages 

 as well as from sternum. 



3. Origin of lower segment of Entopectoral from the costal 

 cartilages, indicating beginning lateral recession of the deep 

 Pectoral origin. 



B. Pectoral Insertion : 



1. Overlapping of the planes, in the form of successive layers. 



2. Folding of the tendon sheet from the main sternocostal 

 portion at the insertion. 



3. Union of the abdominal Ectopectoral and the Entopectoral. 



4. Superficial insertion of Clavicular portion of Ectopectoral 

 and union of same with the Deltoid. 



G. Strong median portion of Coracobrachialis and association 

 of the muscle with the coracoid head of the Biceps. 

 Peculiar and characteristic Lemuroid features appear to be 



the followino; : 



