338 ROBERT J. TERRY 



reaches its greatest breadth opposite the base of the crista semi- 

 circularis; from this point caudad it rapidly diminishes in width. 

 On the lateral wall, dorsad of the maxilloturbinal, is a low 

 antero-posterior eminence produced by a slight inward bulging. 

 of the paries nasi in the region of the lamina supraconchalis. 

 This elevation is at the base of the great naso-turbinal body com- 

 posed of mesenchyma in the present stage (figs. 13, 29). Pos- 

 teriorly, the elevation in question and the nasoturbinal con- 

 tinue into the crista semicircularis (iigs. 13, 27, 28, 29). The 

 latter, at present, forms the anterior boundary of the entrance 

 into the recessus lateraUs (figs. 23, 27, 28, 29) ; it extends ventro- 

 dorsad to the tectum nasi, sweeping in a fine curve caudally, 

 alongside the septum, and terminating at the olfactory fenestra 

 as already described (p. 334, fig. 1). Where the crest ap- 

 proaches the tectum nasi, more or less complete discontinuity 

 of the cartilage occurs in the line of the sulcus lateralis. A 

 small fissure here, made by the foramina epiphanialia (figs. 28, 

 29), separates, for a short distance, the wall of the recessus 

 lateralis from the tectum nasi. A wide meatus of the lateral 

 nasal wall (here termed meatus supraconchalis) runs between 

 the naso- and maxilloturbinal bodies, continuing anteriorly into 

 the atrium. Posteriorly this meatus extends ventrad of the 

 crista semicircularis (here it is very narrow) and enters into a 

 wide space which opens into the fenestra basalis (fig. 13). Just 

 where the meatus passes into this space, and at a spot anterior 

 to the ventral end of the crista semicircularis, the lateral nasal 

 glands lie under cover of the mucosa (fig. 27). In its posterior 

 half the meatus supraconchalis is extended into a groove be- 

 tween the maxilloturbinal ventrally, and paries nasi (lamina 

 supraconchalis) laterally, the sulcus supraconchalis of Voit. 



The middle division corresponds to the prominentia lateralis 

 of the exterior and presents the recessus lateralis to which refer- 

 ence has been made. This large cavity communicates with 

 the general room of the nasal capsule by a wide opening behind 

 the crista semicircularis. Anteriorly it undermines the crest 

 for a short distance in the form of a bhnd pocket; caudally it 

 reaches the first ethmoturbinal, and dorso-caudally opens into 



