321 



3. CH AK.Mll.LLA. 



Coral arborescent, erect, repeatedly trifid ; joints moderate, rather 

 incurred, upper side covered with one ur two scries of cells ; ter 

 ininal joint or tag tritid. 



C. TRIFIDA. B.M 



Hab. Australia. 



II. Cells simple, disposed spirally on the articulation*. Coral 



arborescent, forked. 



4. Serialia. 



Coral arborescent, forked ; articulation elongate, naked at tin- tail; 

 cell-bearing above, subspiral ; terminal joint bifid. 



I. Serialia convoluta. B.M. 



Hab. Van Diemen's Land. 



5. Spiralia. 



Coral arborescent, forked ; articulations short, covered with 

 crowded cells, forming together a nearly continuous spiral series <>! 

 cells on the stem ; tags indistinct. 



1. Spiralia spiralis. 13. M 



2. Spiralia unispiralis. 



5. unispiralis, Holdsworth, MSS. 



III. Cells with an elongated horny process on each side, nn<l 

 disposed spirally on the articulations 



6. CORNALIA. 



Coral arborescent, forked ; articulations elongate, upper end with 

 a crowded spiral series of cells, each armed with nn elongated horn] 

 pmcess on the side. 



I. CoRNAl.lv ArSTRALASI.E. B.M. 



flab. Van Diemen's Land. 



In 1850 Mr. Francis Brent sent me a Coralloid from Western 

 Australia, which i^ exceedingly peculiar in its character; for though 

 u i- evidently allied to Flustra, it i- bo unlike, both in Bubstance and 

 form, any that I have before seen, that I feel assured it must form a 

 distinct genus. 



The Bpecimen is not in a- good a state a- I could wish, 1 therefore 

 placed it mi one side for a time in hope that I might procure other 

 examples that might more completely illustrate its structure j b 

 they have n<>t occurred, I am now induced t-> l>rin^ it before the 

 ty. 

 No. CCCL WII. — Proceedings oi thi Zoolooicai Soctbti 



