EXPLANATION TO PLATK XIX. 



FIG. 1. X rinhin UK iilli'nln Kiirheii]iaiicr. Part of lirancli (enlarged). 



1'. N ,!, tin', lit n/liiiln. Branch with gnnangiuin (much less enlarged). 



:;. ,s'u 'liilm (//<( /iiiiiii'ji-i-ii Jlarthtul). Part of branch ^h<i\ving hydrantbs (enlarged). (After Allman. ) 



4. Sertularella cylindritheca (Allnuin). Part of brain'li (enlarged). (From Allman's type specimen. ) 



5. ,S', i-lnliii-i'llii ilixtitiix (Allman). Part of branc-li (enlarged I. 

 li. ,S'. i-lii/iii'i'/lii ilixliinx. Two hydrotlicM-.-c i ^iv:itly i-nlarvcil |. 



7. .sv/7///i//'iV/</ i/ii/iiiilin Mereschkowsky (slightly enlarged). (After Mereschkowsky. ) 



224 



