PART VI 



THE DEVELOPMENT OF THE SALIVARY GLANDS IN 

 THE DOMESTIC CAT 



By H. von W. Schulte 



The aim of the present paper is to follow, in as much detail as our 

 material permits, the development of the salivary glands of the do- 

 mestic cat, with a view, first, of ascertaining, if possible, the morphologic 

 status of the several glands and their reciprocal relationships, and sec- 

 ond, of determining the nature of the developmental process, especially 

 in reference to the role played by folds in the inception of the anlages 

 and the formation of the ducts of the larger glands. Chievitz's dis- 

 covery of an entomasseteric duct in the human embryo, in one case 

 connected with the parotid, indicated the at least occasional produc- 

 tion of oral derivatives postparotid in situation and very likely of the 

 same source as the parotid itself. The occurrence in the cat of a 

 small gland at the border of the masseter, the zygomatic gland of Mi- 

 vart, which Carmalt, and later Professor Huntington, found of occa- 

 sional occurrence in a wide series of mammals, and finally the discovery 

 of the two parotids in Hyrax (Carmalt, Huntington) gave ground to the 

 hope that further study of the development of this region might throw 

 some light upon the morphology of these structures. It seemed, also, 

 desirable to examine the submaxillar}^' complex in a form where adult 

 conditions were simple, which it was thought might aid in elucidat- 

 ing the involved problems of its interpretation in the mammalian 

 series at large. 



In the development of the larger glands there is again the question 

 of the mode of the process. Chievitz ascribes the formation of the 

 ducts to the constriction and separation from the oral epithelium of 

 solid crests. His had already expressed the opinion that in the case 

 of the submaxillary the duct was formed by the bridging over of a sul- 



igi 



