74 



COMPARATIVE TABLE OF 



Name 



Acainptogorgia atra, 

 Tb onison an <1 

 Henderson. 



A. behrycoide.i, G. 

 von Kocli. 



A bebnjcoides, G. 

 von Kocli, var. 

 rohusta, n. 



, araum, n. sp. 



Branchint! 



A. spinosa, Hiles, 

 var. ceyloHcnsu, 

 Thomson and 

 Henderson. 



A. gracilis, Thom- 

 son. 



A. ruhrn, Tliomson. 



Confined to one 

 plane ; branches 

 arise at right angles, 

 but bend upwards 

 and run roughly 

 parallel to the main 

 stem. 



Branclied in one 

 plane, with frequent 



anastomosis. 



Branched in one 

 plane ; branches 



mostly arise 

 one side. 



from 



Irref,'ular ; branches 

 arise from two or 

 three sides ; there 

 ma\' be abundant 

 anastomosis. 



Profusely branched 

 in one plane ; anas- 

 tomosis common. 



liranched in one 

 ]ilane ; t\vigs arise 



Imost 

 angles. 



at right 



Canenchvnia. 



Fairly thick; 

 globular-like ends 

 of spicules pro- 

 ject. 



Rnufrh; thick. 



Verructe. 



Rough, thorny, 

 bristling with 

 jirojecting spines. 



Thin, and very 

 rough in appear- 

 ance under the 

 lens. 



Rough, with sharp 

 projecting points. 



Thin, and 

 prickly. 



Stand perpendicu- 

 larly at intervals 

 of about 2 mm. ; 

 three or four 

 occur at tips of 

 branches, but 

 none terminal. 



High, almost cylin- 

 drical. 



Almost cylindrical , 

 but somewhat 

 squat ; a number 

 of spines project 

 around the apex. 



Prominent, 3 mm. 

 in height, with a 

 basal diameter of 

 2 mm. 



Low, 08 mm. in 

 height, with a 

 basal diameter of 

 06 mm. 



Stand perpendicu- 

 larly to a height 

 of about 1 mm. 

 At to]) there is a 

 ring of spicules in 

 two rows. 



Small, and arise at 

 right angles to 

 the axis. 



Polyps. 



Restricted to the 

 lateral edges of 

 stem and branches, 

 but here and there 

 on back and front. 



ChieHy on three 

 sides, most abund- 

 ant on lateral sur- 

 faces ; operculum 

 fairly high, spicules 

 arranged in crown 

 and points. 



Occur all over the 

 surface ; operculum 

 low, conical, alrao.st 

 hidden. 



Arise irregularly 

 from all sides ; 

 operculum high, 

 conical, crown con- 

 sists of four rows, 

 and there arc two 

 converging spicules 

 in each point. 



On three sides of the 

 axis ; operculum 

 conical. 



May occur on all 

 sides, but are mostly 

 lateral, sometimes 

 opposite, sometimes 

 alternate, and 

 branch ends in a 

 pair ; opercular 

 covering consists of 

 eight pairs of curved 

 foliaceous spindles. 



Alternate or sub- 

 opposite ; two occur 

 side by side at the 

 end of a branch. 



