gY2 B- DEAN, On the larval development of Amia calva. 



Fig. 20. Larva of about the fifteenth day. X 12. 



Fig. 21. „ „ „ „ „ „ Ventral aspect. 



a anal fin, an anterior naris, ant an. anterior anal fin, h basal fin 

 Support, brs branchiostegal rays, c caudal fin, ch ceratohyal, jug. jugular 

 plate, operculum, jon posterior naris, r radial fin support, v ventral fin. 



Plate 11. 



Fig. 22. Larva of about the twenty-second day. X '^• 



Fig. 23. „ „ „ „ „ „ Dorsal aspect. 



Fig. 24. „ „ „ „ „ „ Ventral aspect. 



Fig. 25. Larva of about the thirty-fifth day. X '^• 



Fig. 26. „ „ „ „ „ „ Ventral aspect. 



a anal fin, an anterior naris, ant. an anterior anal fin, ao anal 

 opening, hrs branchiostegal rays, c caudal fin, c-a membranous fin con- 

 necting caudal and anal, dr dermal fin rays, io interoperculum, jug. 

 jugular plate, la linea alba, o operculum, p pectoral fin, pn posterior 

 narial opening, r radial fin supports, SO suboperculum, ug urinogenital 

 eminence, v ventricle. 



