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.et/i*) 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 fossre 

 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, corniculnui laryngis 

 embedding arytenoid cartilage ; cr, cricoid cartilage :c.t.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 : in, masseter 

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

 m.eth' 2 ', septum nasi : mn, mandibular symphysis : mo, mouth cavity : 

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

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

 process : as, oesophagus : ol.jo, olfactory fossa : pa, parietal : pi, palatine 

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

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

 supra occipital: .y>.i, sp.2, sp.-$, roots of first three spinal nervesi : 

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

 cartilage : tn, tentorium : tr, trachea : it.i 1 , anterior, and n.i", posterior, 

 upper incisor: v.\, atlas; v. 2, centrum, and v.2 r , arch of axis: 

 v-3> v-3'> f third vertebra : v.c, vocal cords : v.l, 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 (u.i 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 

 relations to the nasal chamber in which they are contained. 



367. The delicate, reddish-brown, mucous membrane 

 (Schneiderian membrane) lining the nasal chamber and 



