THE RABBIT. 335 



The section is taken slightly to the left of the median plane so as to 

 clear the mesethmoid (m.eth) : all but the anterior and posterior ends of 

 the septum nasi [m.eth^] is cut away, so as to expose the ri^ht nasal cavity 

 with its turbinals : the brain is removed, so as to show the cranial fossae 

 and the exits of the nerves through the dura mater (it must be remem- 

 bered that many of these run for a considerable distance between the 

 dura mater and the skull before making their exit from the latter) : the 

 muscles at the base of the tongue are partly dissected away so as to 

 expose the right sublingual gland [s.gt). The cartilage is distinguished 

 by fine, the bone by coarse, dotting. 



b.hy, body of hyoid bone : b.o, basi-occipital : b.s, basi-sphenoid : 

 4b.fo, cerebral fossa : cbl.fo, cerebellar fossa : c.la, corniculum laryngis 

 embedding arytenoid cartilage : cr, cricoid cartilage ■.c.t.m, crico-thyroid 

 membrane : epg, epiglottis : eth.th, ethmo-tnrbinal : eu, aperture of 

 Eustachian tube : fl.fo, floccular fossa : fr, frontal : f.v.c, false vocal 

 cord : g.hy, genio-hyoid muscle : i.c.a, internal carotid artery : i.fa, 

 interparietal : ja, Jacobson's cartilage : l.i^ lower incisor ; ?;/, masseter 

 muscle covering edge of mandible : m.eth'^, lamina perpendicularis : 

 m.eth'^, septum nasi : mn, mandibular symphysis : mo, mouth cavity : 

 ni.x, palatine plate of maxilla: mx.ib, maxillo-turbinal : ««, nasal: 

 ^aJb, naso-turbinal : ocat.m, occipito-atlantal membrane ; od, odontoid 

 process ; o:s, oesophagus : ol./o, olfactory fossa : pa, parietal : pi, palatine 

 plate of palatine : pmx, premaxilla: p.na, posterior nares ; /..', pre- 

 sphenoid : s.g, sublingual gland: s.mx, submaxillary gland: s.o, 

 supra occipital: sp.i, sp.2, sp.^, roots of first three spinal nerves: 

 s/./iy, sterno-hyoid muscle : sJ, sella turcica : tg, tongue : (A, tliyroid 

 cai'tilage : in, tentorium : tr, trachea : «./', anterior, and a.i-, posterior, 

 upper incisor: v.i, atlas; v.2, centrum, and v. 2', arch of axis: 

 V.2, z'-S', of third vertebra : v.c, vocal cords : vJ, ventricles of larynx : 

 vi.pa, velum palati : vr.a, vertebral artery : x, bristle passed through 

 right nostril : y, bristle passed through right naso-palatine canal : 

 II— XII, roots of cerebral nerves. 



365. The small paired aperture of the naso-palatine or 

 Stenson's canals (jv), situated immediately behind the 

 posterior upper incisors iu.p-), and leading into the nasal 

 chamber. 



XLVI. Remove the nasal, and enough of the pre- 

 maxilla and maxilla to show : 



366. The ethmo-, maxillo-, and naso-turbinals 

 (eth.tb, mx.tb, na.tb, §§ 61, 63, 66, pp. 274, 275), and their 

 relations to the nasal chamber in which they are contained. 



367. The delicate, reddish-brown, mucous membrane 

 (Schneiderian membrane) lining the nasal chamber and 



