EXPLANATION TO PLATE XV. 



Fit,. 1. SerteZoreHo conica Allman. Part of branch (enlarged). 



1'. Sfrlnliii'i-llii ''iniii-n. View nf margin anil cii>rrru]iim ( fiilurt,'' 1 '! ). 



3. M'l-ttiiiti-rl/ii i-iiiciin (Allman). Part of Allman'a type Bpecimen witli jxunaiiiria (cular^i'il ). 



4. Sertularella quadrata Nnttiiifr. Part of branch (enlarged). 



."i. ,s. i-iiiliin'llii i/muli-Hiii. Single j-(iiiaiij.'iuni with parasitic campanularian (greatly enlaiged). 



li. X. flnliiri'Hn i/iinilratii. Part of branch with gonangia (enlarged). 



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