DEVELOPMENT OF SALIVARY GLANDS IN THE DOMESTIC CAT 295 



"flanged glands like the parotid and submaxillary, and simple diffuse 

 glands, such as the inferior alveobuccal, wliich are merely sprouts. 

 It is keeled, but not sulcal ; its formation is without the assistance 

 of a fold. 



Advancing along the floor of the alveohngual region, it lags slightly 

 behind the subma.xillary. The following measurements are the same 

 as those given for the submaxillary and from the same embryos, 

 with the addition of the sagittal distance between the cranial ends of 

 the two anlages, to show the lag of the greater subhngual. 



These measurements show a progressive cHstancing of the greater 

 sublingual by the submaxillary. The former remains stationary 

 to the period of i8 millimeters. Then an advance is begun, which 

 becomes rapid at ig miUimeters. The separation begins at the same 

 time and is somewhat variable in rate, but on the whole such as not 

 materially to reduce the length of the keel. Like the orbitals the 

 greater subhngual is slow in the initial stages of its development, in 

 contrast to the submaxillary and parotid. It would seem, therefore, 

 that the sulcal position associated with formation of flanges, while 

 not qualitatively altering the process of gland development, wliich is 

 always proUferation, yet in some way favors the early appearance of 

 the anlage and accelerates its growth. This, once initiated, proceeds 

 at a rate unaffected by the presence or absence of a sulcus. Here 

 may be cited the conditions in the 19 millimeter embryo. No. 253 



