514 
J. GRAHAM KERR. 
eitliei’ side of the attachment of the bile-duct rudiment. The 
right is more bulky than the left. Both right and left 
rudiment grow rapidly in a dorsal direction, one on either 
side of the bile-duct, and finally the left arches towards the 
right side, dorsal to the bile duct, comes in contact with the 
tip of the right rudiment, and undergoes fusion with it 
(between stages XXXIII and XXXIV most usually). The 
Text-fig. 12 a. 
Text-fig. 12 b. 
,Tr, I. 
Text-fig. 12 a, b. — Reconstruction of thick horizontal slice through 
Protopterus, showing rudiments of lung and (dorsal) pancreas. 
A. Stage XXXII. b. Stage XXXIV. 1. Lung. op. Operculum. 
pa. d. Dorsal pancreas. p. b. Post-branchial body. p.f. Pectoral 
limb. V. c. Visceral cleft rudiment. 
dorsal pancreatic rudiment has meanwhile been growing 
rapidly. Its wall is still thick and yolk-laden, but its cavity 
has increased in size, and has become more regular in shape. 
With the gradual modelling of the surface of the gut a 
change has been brought about in the attachment of the 
dorsal pancreas ; it now springs from the right side of the 
gut just where the mid-gut is continued forwards into the 
fore-gut. It projects towards the right side of the body, and 
at the same time slightly forwards. 
Up till now the dorsal pancreas has been separate from the 
