230 ME. W. A. FORBES ON THE EXTERNAL CHARACTERS AND 



The pancreas is compact, and of a creamy-red colour. From its extremity it mea- 

 sures 9-75 inches to its "head," and 11"75 inches to its "tail." The duct, as far as 

 could be ascertained, opened into the ductus choledochus as the latter perforated, in a 

 very oblique direction, the wall of the small intestine. 



As regards the vascular system, the aorta gives off the great vessels in a way different 

 from that described and figured by Murie in Otaria juhata. In the latter species the 

 aorta gives rise successively to a right innominate, a left carotid, and a left subclavian, 

 as in Man and many other animals. In Otaria gillesjiii an innominate gives off both 

 left and right carotids close together, continuing on as the right subclavian, which then 

 gives off two smaller trunks, which are apparently the right internal mammary and 

 vertebral arteries; the left subclavian arises independently from the aortic arch, just 

 beyond the origin of the innominate, and also gives off, not far from its origin, two 

 corresponding branches. The ductus arteriosus is conspicuous. 



The trachea is very wide, measuring about 2J inches transversely, and is somewhat 

 dilated at the bronchial bifurcation, being here about 3 inches across. From the right 

 main bronchus, 4 inches below its origin, is given off an extra third bronchus to the 

 uppermost lobe of the lung on that side. Each lung is divided into three distinct 

 lobes, of which the lowermost of each side is the biggest, whilst the middle ones are 

 the smallest. The left upper lobe is deeply divided anteriorly. There is a distinct 

 azygos lobe in addition, of subtriangular shape. The epiglottis hardly exists as a free 

 organ ; it has tumid margins, and a median sulcus. The arytsenoid and thyroid carti- 

 lages are much produced superiorly'. 



The spleen is flattened and elongated, with one end slightly broader than the other. 

 It measures I3| inches in length, and 3 inches across. The thyroid glands are the size 

 of Brazil nuts, and are quite separate from each other. 



The kidneys are compound, and are composed of about forty quite distinct papillae, 

 in each of which the cortical and medullary parts are as distinct as in Murie's beautiful 

 figure of the same organs in Otaria jubata (I. c. pi. Ixxxi. fig. 70). 



The male generative organs have been preserved as a preparation in the College of 

 Surgeons ; so I have not been able to examine them thoroughly. The testes, as already 

 stated, did not lie in any distinct pedunculated scrotum, but were situated in the groin, 

 close to the naked skin round the anus. There is apparently a small prostate, Hke 

 that in 0. jubata (I. c. pi. Ixxxii. fig. 73) ; but both vesiculce seniinales and Cowper's 

 glands are absent. The penis (PI. L. fig. 3) has a large os, which is bifurcated at 

 the apex. This bone in the glans is only covered by a thin coating of pale mucous 

 membrane, which is continued also onto the prepuce. The length of the glans, from 

 the reflected prepuce to the apex, is 2-8 inches ; the notch between the superior and 



' Not having been able to dissect the larynx, which is now mounted in the College of Surgeons, I am unable 

 to describe its internal structure. There are, however, small laryngeal pouches, connected with the lateral 

 ventricles, and opening in the same position as those described by Murie in 0. jubata {I. c. pi. Ixxx. fig. 59). 



