EXPLANATION To IM.ATK XIII. 



1. Tliiiiiirin I'lijiri'Kxiiin ( Linna'iis). Part of branch (cMikiru" 1 '! ) 



1'. Tliiiinriii i-iijiri'XKiiiii. llydrnthrcvi- (!_ r mitly rnlaivcd ) . 



!!. Tliiiinrin nijii-i'uxiiin. Gonangia (enlarged). 



). Pasythea quadridentata ( Kills ami Solandcr). Trci])lifisci]]ic (rnliir^ecl). 



."i. I'lixiiUn'ii ijiiinli-iili'iiliilii. IlyclrnthcMM' ami jionanL'iuin (greatly enlarirfd ). 



ii. I'lis/i/lini quadridentata. SicU> vii'W of jfrouj) of hydrntln'i-ir fcnlar_'c'il (. 



7. I'ux/illii'ii i/iniilriili-iiliitii. Sidr vir\v of two liydrotliefa- (^ri-atly enlarged). 



