152 DE. J. MURIE ON THE WHITE-BEAKED BOTTLENOSE. 



anguli scapuhe is present, and a thin rhomboideus scapulse, or a slip 

 which diverges towards the head part of the levator anguli scapulae, 

 which I take to be such. 



Muscles connected with the auditory canal are very distinct 

 in Lagenorhynchus (as shown in my memoir on Glohiocephalus, 

 fig. 29). There is a retrahens aurem (JRet.), 1\ inches long 

 and \ inch broad, with a somewhat vertical position ; a short, 

 thinner, and broader attollens (Atl.) in front and above the 

 2-curved external auditory tube. Also anteriorly, but lower than 

 the latter muscle, there is a slip representative of an attrahens 

 aurem (Atr.). 



The serratus magnus has three costal digitations ; its anterior 

 insertion goes as far as the axis. A double scalenus obtains : 

 the s. anticus, fixed to the cartilage of the first rib, is continued 

 on to the skull ; the s. posticus occupies the remainder of the 

 first rib and proceds to the atlas. The longus colli is continued 

 into the chest as far as the sixth dorsal vertebra. The triangu- 

 laris sterni intervenes between six sternal cartilages. The ex- 

 ternal oblique clasps more or less all the ribs, a tendon being 

 continued to the first. Its mesial fleshy abdominal border is 

 3 inches broad, and partially overlaps the outer border of the 

 rectus. What I regard as the pectoralis major has an origin 

 from the manubrium to the fourth-rib cartilage ; its fibres thence 

 converge to the proximal root of the fore limb. Whilst the long 

 dorso-spinal muscle corresponds with that of the other Ceti, I may 

 note that, from the close approximation of the numerous long 

 divergent transverse processes, the intertransversales are short, 

 but nevertheless strong ; and this remark applies to the inter spi- 

 nalis. The rotatores are numerous. Short muscles lash together 

 the chevron bones. 



In the Porpoise, Stammius has named two small lateral muscles 

 of the tail transversarius superior and transversa rius inferior. 

 The representatives of these in the White-beaked Dolphin are well 

 developed. The upper one is longish, narrow, and fusiform. 

 It lies above the transverse processes from the fortieth to the 

 sixty-fifth or sixty-sixth vertebra, tapering at either end. The 

 half is fleshy, the posterior half tendinous superficially in its 

 upper half, and slightly muscular on its lower half. 



The lower muscle corresponds in many respects with the 

 preceding, but arises further forwards, and stops short a few 

 vertebra) proximal of the other. 



