EXPLANATION T<> I'LATE XVIII. 



Fi,.. I. ,V, ///.//,/ l,,,,-ll lAl.lcri. Part (il'n.liiiiy 



1'. ,S'i rliilni'illii li'in'lln. Kml iif livilmtlicca, *hi>\vinx oprmiliim (iircatly 

 :!. Si-i-ln/iii-i'llii iillinniii Ilurthiuli. Part nf culony ( rnlaiwd ). 



4,">. Ki'rtiilri-llii iil/uiiiiii. Ilydrutlu'i-.'i-, ^!ni\viii^ niavinn ami ii|nTi-iiliini (iirratly 

 (i. Serlularella allmani. (iunanxinin (cular^cil ). 

 7. Si'rliilnri'llii rtnilorta KirchenpauiT. I'art <il lu-anrh inilarncil i. 

 S. ,S','i-//<in//-i riniliirla. Hydruthci-a, shuwiiiLr margin (greatly enlarged). 

 ;i. Serlularella, contortd, Gonangium (enlarged). 

 Id. SerlulareUa lota (Bale). I'art nf branch I I' 



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