DR. J. MITRIE ON THE ANATOMY OF THE SEA-LION. 579 



hippocampus major shown, sy. Sylvian fissure ; mc, middle cornu; hm, hip- 

 pocampus major; 2, 3, 4, portions of roots of corresponding nerves. 

 Fig. 47. Dissections displaying the heart, the great vessels, their divisions, and portions 

 of the lungs. 



1, 2, 3, 4, roots of difierent lobuli of right lung ; tr, trachea at its bifurcation ; a portion 



of the pulmonary substance is removed to show the bronchial divisions and vessels at 



lung's root; ao, dilated arch of the aorta; ao*, descending aorta, of diminished 



calibre ; Pa, pulmonary artery ; da, ductus arteriosus ; i, innominata ; r.s, l.s, right 



and left subclavians; r.c, l.c, right and left common carotids; r.s, l.s, right and left 



subclavian arteries ; v, vertebral ; im, internal mammary ; vc, vena cava descendens. 



Fig. 48. Reduced sketch, exhibiting the semidivided upper or anterior surfaces of the 



great hepatic venous sinuses, and their relations to the diaphragm, liver, and 



stomach, as seen on removal of the parts en masse. 



Fs', right moiety, and Vs^, left moiety of the hepatic venous sinus or dilated vena cava 

 ascendens; D, diaphragm; hr, its broad ligament; r.l, round ligament; la, right 

 lateral ligament; St, stomach, hidden in great part by the liver; O.b, gall-bladder. 



Fig. 49. Vertical antero-posterior section of the contents of the right orbit, made 

 slightly to one side of the median line : I, lens ; V, vitreous chamber ; 

 A, anterior or aqueous chamber ; c, conjunctiva ; co, cornea ; sc, sclerotic at 

 its thickened hinder part ; ch, choroid ; r, retina ; cp, ciliary processes ; i, iris ; 

 P, canal of Petit ; S, venous sinus or canal of Schlem ; n, opening of nasal 

 duct ; gl, gland ; t, tarsal cartilage ; o, optic nerve ; a, artery ; Es, Hi, supe- 

 rior and inferior rectus ; cho, choanoid muscle. 



Fig. 50. Inner view of the anterior segment of the eyeball, cut crossways. The lettering 

 applies as in the preceding : sj), sphincter iridis. 



Fig. 51. The vitreous humour with adherent crystalline lens and zonula of Zinn. Seen 

 in front, and about nat. size. The dark pigmental radial processes (p) of the 

 ciliary zone are unusually long and prominent. 



PLATE LXXX. 



Fig. 52. Tongue and fauces of the Sea-lion shown as an anatomical preparation, looking 

 into the throat, but in a three-quarters view. 



V, velum palati ; a, anterior pillars of the fauces ; p, posterior pillars ; t, right tonsil ; 

 e, right postlingual eminence, or postfaucial tract ; g, mesial groove or cleft. 



Fig. 53. Under surface of the tongue, larynx, and portion of the trachea. The super- 

 ficial layer of muscles &c. are retained on the left side, and a deeper dissec 

 tion of the several structures brought out on the right. 



