320 



because the end of the stem beyond the cluster of cells is produced 

 into two setaceous filaments or tags. If these tags are examined, it 

 will be found that the cells are gradually developed upon them, and 

 they are only the commencements of the next articulations which are 

 to bear the cells. They are to be observed, more or less developed, 

 on all the species I have examined ; and when the stem is simple, as 

 in A. lendigera, there is a single tag ; and when the coral is repeatedly 

 forked, then there are two tags at the end of the last cell-bearing ar- 

 ticulation, as is also the case in A. lendigera, where a branch is 

 going to be formed. In the genus now noticed, as the branches 

 arise in three, it has three such tags. 



Charadella. 



Polypidom tree-like, branched ; stem formed of numerous tubes, 

 forming at the base an expanded mass of tubes ; branches numerous, 

 pinnate or bipinnate, formed of numerous articulations, each articu- 

 lation throwing off, at its point of junction, two opposite branches 

 formed of a single joint, each joint furnished on its upper edge with 

 a series of small subequal tubular polype-cells. 



1. Charadella trifida. B.M. 



Pale brown ; the branches furnished at the end with trifid tags, 

 being the commencement of the branches in process of formation. 



Hah. Australia, Portland (Mrs. Maccloud). 



The coral form a bush 8 or 10 inches high. 



The genus Amathia of Lamouroux and Serialia of Lamarck forms 

 a very natural group, which may be divided into the following genera 

 or subgenera. 



I. Cells simple, in a straight cluster on the joints. 



1. Amathia. 



Coral creeping ; stems rarely forked ; joints filiform, the upper 

 half covered with one or two series of cells, terminal joint or tag 

 simple or rarely bifid. 



1. Amathia lendigera. B.M. 



2. Amathella. 



Coral arborescent, erect, repeatedly forked ; joints short, rather 

 incurved, covered with one or two series of cells ; terminal joints or 

 tags bifid. 



* Cells in two series. 



1. Amathella biserialis, Krauss. B.M. 

 Hab. S. Africa. 



** Cells in one compressed series. 



2. Amathella uniserialis. B.M. 



