516 
J. CxEAHAJI KERR. 
differences in topographical relations in early stages. In 
a larva of stage 32 (text-fig. 4, a) the dorsal pancreas forms 
a rounded projection from the gut^ as in Protopterus, but 
situated farther back, well behind the level of the hinder 
pronephritic nephrostome. The rudiment in Lepidosiren 
has already a wide cavity opening into the cavity of the gut. 
By stage XXXIV the yolk in the rudiment is practically used 
up, and by stage XXXV the gland cells and duct lumiua are 
distinguishable; the whole organ is penetrated by a rich net- 
work of blood-vessels, and the outer surface of the organ 
presents a distinctly lobed appearance (see text-fig. 13). 
Text-fig. 13. 
Part of the dissection shown in text-fig. 4, b (p. 490), with the 
kings removed so as to show the pancreas. /, g. Fore-gut. 
ht. Heart. H. Liver, pa. Pancreas, ph. Pharynx, v. Vein. 
As regards the later development of the pancreas in 
Lepidosiren and Protopterus, the only point requiring 
special notice is that in the adult (cf. text-fig. 4, d), as was 
