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.etJi 1 } is cut away, so as to expose the right nasal cavity 

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

 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.gl). 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 : 

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

 embedding arytenoid cartilage : cr, cricoid cartilage :c3.m, crico-thyroid 

 membrane : epg, epiglottis : eth.tb, ethmo-turbinal : 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.pa, 

 interparietal : ja, Jacobson's cartilage : Li, lower incisor : m, masseter 

 muscle covering edge of mandible : m.eth 1 , lamina perpendicularis : 

 ni.eth?, septum nasi : mn, mandibular symphysis : mo, mouth cavity : 

 tux, palatine plate of maxilla : mx.tb, maxillo-turbinal : na, nasal : 

 na.tb, naso-turbinal : oc.at.m, occipito-atlantal membrane : od, odontoid 

 process : ces, oesophagus : ol.fo, olfactory fossa : pa, parietal : pi, palatine 

 plate of palatine : pmx, premaxilla : p.na, posterior nares : f.s, pre- 

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

 supra occipital: sp.\, sp.2, sp.%, roots of first three spinal nerves: 

 st.hy, sterno-hyoid muscle : s.t, sella turcica : tg, tongue : th, thyroid 

 cartilage : tn, tentoriuui : tr, trachea : u.i 1 , anterior, and u.i", posterior, 

 upper incisor: v.i, atlas; v.2, centrum, and v.2 1 , arch of axis: 

 ^3 v-3'f f third vertebra : v.c, vocal cords : v. I, 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 : 

 // XII, roots of cerebral nerves. 



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

 Stenson's canals (y\ situated immediately behind the 

 posterior upper incisors (#.z 2 ), 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 



I relations to the nasal chamber in which they are contained. 



367. The delicate, reddish-brown, mucous membrane 

 (Schneiderian membrane) lining the nasal chamber and 



