2S8 DEVTELOPMENT OF SALIVARY GLANDS IN THE DOMESTIC CAT 



late retention of the angular position, occurring in 19 millimeter 

 embryos, one is evidently a condition of late origin. Much of the 

 intermediate portion of the flange has been lost, but the narrow frag- 

 ment remaining is not flat and compressed, as is usual, but of convex 

 outlines. There is no free sprout. In itself the section is not con- 

 vincing, but in view of the fact that just this appearance is constant in 

 cases where a free sprout is attached to the flange, it must be con- 

 sidered as an orbitoparotid in its inception. It is interesting to note 

 that Chievitz figures the attachment of the parotid in one of his hu- 

 man embryos with this enlargement of the intermediate portion of the 

 flange. The second case occurs in embryo No. 80. Here the orbito- 

 parotid is large, 140 fi long, and extends along the mesal side of the 

 parotid duct as far as the facial vein, in the gutter of the dorsum of 

 which it rests. The position of the attachment can only be accounted 

 for by supposing that the orbitoparotid has been able to advance at 

 the same rate as the parotid itself. The supposition is not difficult, 

 for frequently the orbitoparotid is keeled, and sometimes the caudal 

 sections of the keel are constricted at their base, repeating in miniature 

 the later stages of the parotid attachment. 



The attachment to the parotid duct is infrequent. It is always 

 to its mesal side and, within the proximal third of the promas- 

 seteric segment of the duct. These elements tend to take a course 

 midway between the parotid and the buccal sulcus (Fig. 99) a direction 

 which, if continued, would cause them to abut directly upon the 

 broad border of the masseter. None of them is large enough to do 

 this, and the position would seem to be an unfavorable one for develop- 

 ment. Exactly how far caudad an orbitoparotid can take origin from 

 the duct cannot be determined. Chiev-itz reported a case in man where 

 the cranial process of the orbital inclusion (his entomasseteric duct) was 

 continuous with the parotid at the border of the masseter. Similar con- 

 nections have been reported by Ehzabeth Weishaupt in the pig, and are 

 present in one pig and one chevTotain of our series. Had an orbito- 

 parotid sprout of angular position been present in one of the embryos, 

 it would have been attached to the parotid duct at the junction of its 

 promasseteric and transmuscular segments. E\-idently, therefore, the 

 range of the orbitoparotid extends over the whole promasseteric 

 portion of the duct. On the other hand, efflorescent lobules may 



