*£*" ^ Zc. 



a.c.zx 



Fig. 193. — Development of dorsal venous system of Polypterus 

 the dorsal side. 



as seen from 



Stages 27-29 (A) ; 31 (B) ; 33 (C) ; 30 mm. larva (D and E). ax.v, anterior cardinal vein ; an, anas- 

 tomotic vein; d.C\ duct ot'Cuvier ; h.v, hepatic vein; h. (p. v.c), posterior vena cava; i.j, inferior jugular ; 

 ix inter-renal vein ; l.r, lateral cephalic; l.v, lateral cutaneous; p t pulmonary vein ; p.c.v, posterior 

 cardinal ; pv, pronephric sinus ; s, subclavian vein ; Tk, thyro rl. 



418 



