54 



COMPARATIVE TABLE OF 



Name. 



A. verrilli, Studer. 



A. loruiifiom, Wright 

 and Studer. 



A. ridleyi, Wright and 

 Studer. 



A. liixa, Wriglit and 

 Studer. 



A. ramosissima, Wright 

 and Studer. 



Branching. 



Ccenenchyma. 



Sparse branche.s arise at 

 riglit angles and then 

 run parallel to the stem. 



Sparselj' in one plane, 

 short stem dividing 

 into two principal 

 branches. Apex occu- 

 pied by a polyp. 



Branches on three sides, 

 of which two on oppo- 

 site sides most deve- 

 loped. Tip of twigs 

 occupied b}' a polyp 

 and thickened. 



Chietly on two sides in 

 irregular alternating 

 series, forming angles 

 of 70° to 90°. 



Thin. 



Strongly and densely 

 ramified, branches 

 from three sides; in two 

 opposite directions ; in 

 one plane they are 

 stronger ; angle of 

 divergence 4.5° to 50° ; 

 bush-like. 



Thin, transparent. 



Thin and transparent. 



Thick, with spicules in 

 lonrritudinal series. 



Thin and transparent. 



Verrucse. 



4-8 m:ii. long, expanded 

 at the summit, which 

 is surrounded liy eight 

 bundles of projecting 

 spicules. 



With eight longitudinal 

 rows, each formed of 

 two rows of converging 

 spicules, from tips of 

 which eight bundles 

 of spicules project. 



With eight longitudinal 

 rows, cylindrical, ex- 

 panded at end, eight 

 projecting bundles, 

 each bundle consisting 

 of at most three spi- 

 cules. 



With eight longitudinal 

 rows, in each two rows 

 of needles converging, 

 the angle of converg- 

 ence liecoming blunter 

 near the tip, with a 

 peripheral ring of pro- 

 jecting spicules. Cylin- 

 drical, expanded at 

 end. 



Not in eight longitudinal 

 I'ows, eight bundles at 

 mouth. Cylindrical, 

 expanded at tiji. 



