648 ■ Jacob Parsons Schaeffer. 



EXPLANATION OF FIGURES 



FiGP.21, 22, 23 (X 1.2) Drawings of specimens of the lateral nasal wall from 

 the anatomical series, Cornell University. The drawings all represent the 

 lateral nasal wall of term fetuses. 



Compare especially the regions of the ascending crura of the ethmoidal conchae 

 in the three figures. In fig. 21 the ascending and the descending rami of the 

 ethmoidal meatuses are continuous. In fig. 22, however, the very rudimentary 

 ascending rami of the ethmoidal meatuses are not continuous with the descending 

 rami — save in the meatus medius. It will be noticed in fig. 23 that there is no 

 attempt at the differentiation of individual ascending crura for the ethmoidal 

 conchae; the concha media is, however, an exception. In the latter figure the 

 ascending crura are represented by a general ascending-crural mass undiffer- 

 entiated. 



Note the extensive furrows on the medial surface of the concha nasalis media 

 in figs. 21 and 22. 



a, c. e, g, i — ascending rami of the ethmoidal meatuses; w, u, s, p, n = descend- 

 ing rami of the ethmoidal meautses; b, d, f, h, k = ascending crura of the ethmoi- 

 dal conchae; v, t, r, o, m = descending crura of the ethmoidal conchae; I — sinus 

 sphenoidalis; X = Incisura retrolobularis. 



Figs. 24, 25, 26 Drawings of specimens of the lateral wall of the nasal cavity 

 from the anatomical series, Cornell University. 



Fig. 24 (X 1.2) From a fetus at term. Shows a marked ascending ramus for 

 the meatus nasi medius. The other ascending rami present are less developed 

 and do not reach the corresponding descending rami. Note also the multiple 

 furrows on the medial surface of the concha nasalis media. 



Fig. 25 (X 1.2) From a 7-months fetus. To show the furrows on the concha 

 nasalis media and the lobule in the region of the knee. There is little or no dif- 

 ferentiation in the region of the ascending crura for the concha superior and the 

 concha suprema I. 



Fig. 26 (X 1.8) From a 190-day fetus. The differentiation into individual eth- 

 moidal conchae has not progressed very far at this early period. Compare 

 with fig. 21. 



