ANATOMY OF THE CALIFORNIAN SEA-LION. 321 



are nearly, though not quite, united by a very thin bridge of hepatic 

 tissue developed between them over the broad vena cava. The round 

 and suspensory ligaments are well developed. The gall-bladder is 

 elongated, and appears on the superior aspect of the liver. As compared 

 with Dr. Murie's figure (1. c. pi. Ixxxii. fig. 72) of the liver in Otaria 

 jubata, that of the present species differs chiefly in the more regular 

 outlines of its lobes, and the much smaller development of additional 

 sulci on its inferior aspect, in these respects more resembling the 

 liver of ordinary Mammalia, and presenting less approximation to the 

 greatly complicated liver of the Seals. 



The pancreas is compact, and of a creamy-red colour. From its T - ? s - 

 extremity it measures 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 

 jubata. 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 gillespii 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 2| 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 arytenoid and thyroid cartilages are much produced superiorly *. 



The spleen is flattened and elongated, with one end slightly broader 

 than the other. It measures 13| inches in length, and 3 inches across. 

 The thyroid glands are the size of Brazil nuts, and are quite separate 

 from each other. 



* 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. pl.lxxx. fig. 59). 



Y 



