336 ROBERT J. TERRY 



ina, the line of junction being marked ventrally by a longi- 

 rudinal groove. The anterior free margin is straight and 

 reaches further rostrad than the lateral wall of the nose. Dor- 

 sally, the septum presents between the olfactory fenestrae a 

 free concave edge (there is no evidence of a crista galli) and, in 

 its precerebral portion, continues into the tectum nasi. The 

 latter relation appears in the sections of the anterior third of the 

 nose as a bifurcation of the septum into two laminae, which 

 extend on either side into the roof of the nose (fig. 28). In 

 this way the sulcus suprasep talis is formed. 



Interior of the nasal capsule (figs. 13, 25 to 30). The confor- 

 mation of the nasal capsular walls from within is extremely 

 simple at the present stage as compared with that of the adult. 

 Turbinal processes are in evidence in the form of ridges, the 

 maxilloturbinal alone showing any degree of scroll form. The 

 bones in relation to the nasal cavity are the vomer, incisivum 

 and maxilla. 



Lateral wall of the cavum nasi. In figure 13, which repre- 

 sents the left lateral wall of the nasal capsule from within, the 

 following parts, already referred to, will be recognized: the 

 tectum nasi extending from the fenestra narina to the fenestra 

 olfactoria, the posterior cupola and lamina transversalis anterior, 

 parts showing cut surfaces at their junction with the septum 

 nasi; ethmoturbinale I and II presenting at the olfactory fenes- 

 tra; the crista semicircularis and the nasoturbinal ; the inrolled 

 ventral margin of the paries nasi forming the maxilloturbinal 

 and atrioturbinal. The lateral wall of the cavum nasi presents 

 two unequal divisions: a small region ventrad of the level of the 

 maxillo- and atrioturbinals, and an extensive region dorsad of 

 this level. The former includes the sagittal portion of the 

 lamina transversalis anterior and the incisura posttransversalis; 

 the latter corresponds to the rest of the lateral nasal wall. 



Ve7itral region of lateral wall of the cavum nasi. The sagittal 

 portion of the lamina transversalis anterior presents a smooth, 

 concave surface toward the cavum nasi, becoming broad ven- 

 trally where it passes into the floor of the nose (frontal portion 

 of the lamina transversalis anterior). Caudad of the lamina 



