PLATE 4 



EXPLANATION OF FIGURES 



35 Transverse section of the margin of the liver of an embryo of Torpedo 

 ocellata 29 mm. long; alum hematoxyliji. X 350. 



36 Section of an anastomosis between two hepatic tubules of an Acanthias 

 embryo 14 mm. long (S.C. 30) ; alum hematoxylin. X 500. (This section shows 

 a stage intermediate to those shown in figures 26 and 27) . 



37 Transverse section of a terminal bile duct of an embryo 95 mm. long (H.E. 

 C. 1882); alum cochineal. X 400. 



38 Hepatic tubules and mesenchjanal ingrowths from a transverse section of 

 the dorsal margin of the liver of an Acanthias embrj-o 24.7 mm. long (H.E.C. 

 1492); iron hematoxylin. X 400. M, mesench^anal ingrowths. H.t., hepatic 

 tubules. 



39 Transverse section of a developing bile duct of an Acanthias embryo 24.7 

 mm. long (H.E.C. 1492); iron hematoxylin. X 400. 



308 



