SKULL OF A HUMAN FETUS OF 40 MM. 407 



Below the dorsal extremity of the planum antorbitale is a 

 wide notch, the dorsal palatine notch (f g. 12), partly filed by the 

 developing upper portion of the palate bone; below this is a 

 rounded angle, from which the sharply-marked lower bqi'der 

 runs forward and outward, with a slight concavity downward, 

 to end, by an • upward and inward bend, upon the posterior 

 prominence (fig. 3). ^^Tien the capsule is looked at from below 

 it is seen that the ventral two-thirds of this lowermost border is 

 concerned with the attachment of the solum nasi (f g. 2). Above, 

 the line of attachment of the sphenoethmoidal cartilage marks 

 off the upper surface of the paries nasi from the tectum, and just 

 beneath this line, and close to the surface of the planum antor- 

 bitale, but separated therefrom by connective tissue, there is 

 to be seen a small nodule of cartilage, the cartilago paraethmoidalis 

 (figs. 3 and 16) apparently of the same age as that of the adja- 

 cent wall. It is oval in shape and bears no apparent important 

 relationship to the neighboring structures. Within the capsule 

 the superior nasal meatus corresponds to the dorsal area of the 

 planum, while the middle meatus is medial to its anterior portion. 



The ventral portion of the paries nasi (fig. 3) (paries nasi 

 sensu strido), is thrown into a number of eminences, between 

 which lie corresponding hollows. In its dorsal area is to be seen 

 the prominentia posterior, a small swelling upon which the poste- 

 rior maxillary process appears. The prominence does not ex-» 

 tend so far laterally as the lower border of the antorbital plane 

 behind and below it; the latter is continued upward and in- 

 ward, curving over the sunmiit of the prominence to enclose, 

 in the downward concavity thus formed, the posterior maxillary 

 process. The latter is wide and flat, projects vent rally and is 

 cut off in front and above by a sharply marked furrow, being 

 unbounded below and behind (fig. 17). The slender la'crimal 

 bone lies along its upper border, and a short distance lateral and 

 below is an elongated nodule of cartilage, the anlage of the pro- 

 cessus paranasalis, which may be known as the cartilago para- 

 nasalis. This presents a free ventral extremity and a dorsal 

 extremity closely applied to, but not continuous with, the lower 

 aspect of the posterior prominence. It is separated from the 



