ART. 13 ANATOMY OF CHINESE FINLESS PORPOISE HOWELJLi 35 



culate portion consists largely of a bundle of stout tendons, and 

 the attachments are to the chevrons as far as these occur; to the 

 centra; and to the ventral surface of the transverse processes. As 

 the thorax is approached the mass rather rapidly diminishes in 

 size and but few fibers extend craniad of the fourteenth thoracic 

 vertebra. 



Broadly speaking, this muscle seems to be very similar in those 

 Cetacea so far investigated, although it must vary much in size. 

 Schulte found that in Kogia and Balaenoptera it is imperfectly 

 divisible into three parts, but the condition of the specimens of 

 Neomeris did not allow of subdivision. It is undoubtedly made up 

 of elements of the psoas, iliacus, and quadratus lumborum muscles. 



MUSCLES OF THE ANTERIOR LIMB 



As previously mentioned, the whole scapula is encased in a tough, 

 membranous sheet of tissue, and it is to this, and not upon the bone, 

 that the muscles are attached. 



The deltoideus is enormous, arising from the scapular membrane 

 along the entire vertebral border. As it passes distad, numerous 

 bundles of tendinous fibers develop upon the superficial belly, and 

 insertion is not only across the whole of the lateral aspect of the 

 humerus, just distad to the center of the shaft, but around both 

 borders and barely onto the "medial aspect of the bone. The extent 

 of this muscle is thus over the entire lateral face of the scapula and 

 all but the distal part of the lateral humerus as well. There is no 

 subdeltoideus. 



Instead of covering every other muscle of the scapula save a very 

 small portion of the teres major, the deltoid of Kogia and Balae- 

 noptera overlies but two-fifths to a half of the dorso-lateral portion 

 of the scapula, but in Glohiocephala it is practically as extensive as 

 in Neotneris. The insertion in the former genus is not given, but in 

 Kogia and Balaenoptera it is less extensive. 



The supraspinatus is rather small, originating from the scapular 

 membrane over the supraspinous fossa but not approaching the 

 vertebral border. Insertion is along the cranial border of the head 

 of the hutaerus. It passes beneath the acromion but has no true 

 attachment to that process. 



In Kogia this muscle seems to be smaller and originates chiefly 

 from the medial aspect of the enormous acromion instead of from 

 the scapula proper. In Balaenoptera^ Glohiocephala, and Phocaena, 

 however, it arises from the usual supraspinous fossa. 



The infraspinatus originates from the scapular "membrane over a 

 rather irregular area, which approaches the vertebral border only 

 at the glenovertebral angle, and is quite widely separated from the 



