On the lurval development of Amia calva. 



EP CP 



663 



stomodaeum, NM neuromeres, P parencephalon, PA paraphysis, PD plica eucephali dor- 

 salis PV plica encephali ventralis, RO recessus opticus, S larval sucking organ, SD sac- 

 culus dorsalis, Ä/ sinus dorsalis, 8 PO sinus post-opticus, ÄTsacculus ventralis, iTP tuber- 

 culum posterius, FT" velum transversum. 



