256 E. A. BAUMGARTNER 



The development of the duodenum and the gastro-duodenal 

 loop has been described by Goette and others who described the 

 changes which bring the opening of the dorsal pancreatic duct 

 nearer to the pylorus than the ventral ducts. Goeppert ('91, 

 p. 113) stated concerning this: '' — so erhiilt mann in den 

 Schnitten die dorsale Anlage spater als die ventralen Anlagen. 

 Wenn mann aber die schrag absteigende Richtung des vorderen 

 Schenkels der Gastroduodenalschlinge beriicksichtigt, sieht 

 mann leicht dass das dorsale Pankreas trotzdem einem noch 

 etwas vor der Miindung des Leberstieles gelegenen Theil der 

 Darmwand angehort . ' ' 



Brachet ('95) has described the position of the digestive tract 

 in young axolotl. The duodenum continuing caudally from the 

 stomach he has termed the first descending limb; the caudal 

 turn, the 'premiere courbure;' then ascending limb, 'seconde 

 courbure,' and second descending limb. 



The dorsal and ventral pancreatic anlagen at this stage are 

 composed of masses of cells still containing many yolk-granules. 

 The ducts of both appear as constricted portions of the out- 

 pouching connecting them with the duodenum and the common 

 bile-duct. 



During the 12 and 13 mm. stages the dorsal pancreas comes 

 in contact with the ventral one. The dorsal pancreas forms an 

 irregular mass lying to the right of the duodenum and dorsal 

 to the caudal yolk-mass. A small part extends anteriorly 

 and somewhat ventrally and comes in contact with the right 

 pancreas. In a 13 mm. embryo the two masses are fused 

 (fig. 31). The acini ot the two actually fuse as is shown by 

 figure 32. The ventral pancreas ig the smaller. A small part 

 of the left ventral pancreas lies along the left side of the gall- 

 bladder and anterior to the duodenum (fig. 45). The hepatic 

 ducts extend through the ventral pancreas anteriorly to the liver 

 but have no connection with the former. The right ventral 

 pancreas in figure 31 has not grown dorsalward to any extent 

 to join the dorsal pancreas. The dorsal pancreas in this case 

 has grown ventrally and to the right to join the ventral pancreas. 



The dorsal duct is now well developed. It extends dorsally 

 and slightly to the right from the right dorsal side of the duo- 



