DR. J. MUniE ON JHE WniT-B-BEAKED DOTTLENOSE. 151 



aorta. ^ I noted that the proximal orifices of tlie intercostals are 

 not widely circular, but transversely elliptical, and so placed 

 towards the main feeder (i. e. proceed rather forwards at an acute 

 angle) that the flow of blood into them is not direct with the 

 aortic stream, but at a tangent from it. Besides oblique pro- 

 gression of the current, the sliape of the opening must hinder 

 speedy diversion of the blood's course. 



Between the aortic branches there is a range of bean-like 

 lymphatic glands. 



A large artery and vein issue from beneath the posterior end of 

 tlie paramastoid, and about | an inch forwards from this divide 

 respectively into two branches. 



The lingual artery, surrounded by veins, passes within the 

 posterior end of the genio-hyoglossus and betwixt its two heads, 

 being finally distributed to the substance of the tongue by su' 

 licrficial and deep branclilcts. 



The lingual nerve goes to the outer side of tlio genio-hyoideus, 

 sends a small branch to the upper division of the muscle; and its 

 m^iin division, wliich again bifurcates, passes along the outer side 

 of tlie genio-hyoglossus, ultimately ramifying on the outer side 

 of the tongue. 



7. Fatty Covering and some Muscles of the Body.— AW the Ce- 

 taceans, I believe, are provided with a thick robe of fat. 



In the body of Lagenorhynchus the adipose tissue is in two 

 layers, viz. :— an upper, covering or superficial to the panniculus ; 

 and another, lying between that muscle and the deeper series' 

 this being i inch in thickness. Besides, here and there fat fills 

 the interstices betwixt fleshy parts. Excepting the superincum- 

 bent layer spoken of, it is to be observed that the spinal muscles 

 are remarkably free from it, and so are the pectoral extremi- 

 ties ; indeed the latter and the caudal region have a fibro-ten- 

 dinous sheet which takes its place. 



The sheet of the panniculus carnosus is extensive, at the sca- 

 pula passing up and partly over the long spinal muscles ; pos- 

 teriorly it thins and narrows as it runs back towards the lumbo- 

 caudal region. The latissimus dorsi, long and thin, becomes 

 tendinous at the sixth rib, and terminates on the chest by 

 tendons into the eleventh and twelfth. It touches the scapula 

 as it passes to the humerus. 



There is a thick and strong costo-coracoid muscle traversing 

 from tlie first sternal cartilage to the scapula. A distinct levator 



