232 DEVELOPMENT OF SALIVARY GLANDS IN THE DOMESTIC CAT 



the cranial process are continuous by means of a low flange, the orbito- 

 parotid bridge (16). The sprout is directed ventrad, slightly caudad, 

 and laterad from its attachment, which lies dorsal to the facial vein, 

 intervening between its mesal and ventral tributaries. A series of 

 sections through the flange is given in Figs. 66-73. The cranial 

 sections resemble those of the embryos already described, save for the 

 absence of the parotid fissure. This appears in the caudal sections as 

 a minute indentation of the base of the flange. The sagittal length 

 of the attachment is reduced to 67 fi. In Fig. 72 the outhnes of the 

 intermediate portion are obscured, the adjacent mesenchyme is thick- 

 ened. If this section is compared with the caudal section of the flange 

 in embryo No. 213 (Fig. 61), the distance from the enlargement of the 

 duct to the oral epithelium will be found to be the same. The diiYer- 

 ence is in the obscuration of the intermediate portion of the flange, so 

 that it is difficult in Fig. 72 to determine whether the duct is free or 

 not. In the next section the duct is free, but a minute flange projects 

 from the fundus of the buccal sulcus. Its outline is indistinct, it is 

 constricted at its base, and the adjacent mesenchyme is thickened. 

 Caudad it is more strongly deflected ventrad, but can be followed into 

 continuity with the orbital inclusion — it is the orbitoparotid bridge. 

 In embryo No. 216 (Fig. 45) the sprout has lengthened ; its enlarged 

 fundus is more distinctly defined against the slender duct ; its position 

 with reference to the angulus oris and the buccomasseteric nerve is 

 not materially different from that in embryo No. 219. The orbito- 

 parotid interval is well defined (ij) ; an orbitoparotid element is 

 present on the left side at the junction of the parotid with the oral epi- 

 thelium. Except in this point the anlage of the right side is identical. 

 A series of sections through it are given in Figs. 74-81. The cranial 

 sections resemble those of the earlier stages. The sagittal length of 

 the anlage is reduced to 54 /x. The intermediate portion of the flange 

 is lacking. In its caudal section (Fig. 78) the flange projects ventrad 

 and laterad from the buccal sulcus, thickened at its lateral border, con- 

 stricted at its attachment. In the next section (Fig. 79) the duct is 

 free and separated from the buccal sulcus by rather dense mesenchyme. 

 In the following section the duct lies at a distance from the buccal sulcus, 

 and in a position corresponding to the thickened margin of the flange 

 in earlier embryos. A comparison with embryo No. 219 makes it 



