DEVELOPMENT OF LIVER AND PANCREAS 



213 



place in most of the 13 imn. Amblystoma embryos which I 

 have observed, and is described in stage 42 (29 mm.) in the 

 Normal Plate series of Necturus. Also the limbs, particularly 

 the caudal ones, appear comparatively later in Amblystoma. 

 Such a table, of course, can be only an approximate comparison. 



TABLE 1 

 Correlation of Amblystoma embryos with the Normal-plate series of Necturus 



II. THE DEVELOPMENT OF THE LIVER, HEPATIC DUCTS AND 



GALL-BLADDER 



1. Literature 



The literature of the development of the great glands of the 

 digestive tract of Amphibia can be conveniently divided into 

 two parts covering two fairly distinct periods: first, the work 

 of the early investigators who determined the position of these 

 glands in the embryo and their relation to the lower germ layer; 

 second, the series of contributions beginning with Goette's 

 large monograph upon the development of Bombinator ('75) 

 and dealing mainly with the detailed developmental anatomy 

 of these organs. 



THE .\MBU1CAN JOURNAL OF AXATOMY, VOL. 19, NO. 2 



