PLATE 4 



EXPLANATION OF FIGURES 



43 Anterior view of a reconstruction of the liver of an Acanthias embryo 15.5 

 mm. long (S.C. 1). X 120. 



44 Anterior view of the reconstruction illustrated in figures 41-42. X 150. 



G.bl., gall bladder 



St., stomach 



T.n.L, T.l.a., anterior left tubule group 



T.a.r., anterior right tubule group 



T.d.L, dorsal cluster, posterior left 



tubule group 

 T.d.r., dorsal cluster, posterior right 



tubule group 

 T.l.m., left medial tubule grouj) 



T.p.L, posterior left tubule group — 



the separate clusters cannot be seen 



in this view of figure 43. 

 T.r.ni., right medial tubule group 

 T.r.l., ventral cluster, posterior left 



tubule group 

 T.v.r., ventral cluster, posterior right 



tubule group 



39S 



