152 Zoological Society : — 



1. ChARADELLA TRIFIDA. 



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

 being the commencements of the branches in process of formation. 

 Hab. Austraha, Portland (Mrs. Maccloud). 

 The coral forms a bush 8 or 10 inches high. 



The genus Amathia of Lamouroux and Serialia of Lamarck con- 

 stitutes 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. 



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. 

 Hah. S. Africa. 



** Cells in one compressed series. 



2. Amathella uniserialis. 



3. Charadella. 



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

 incurved, upper side covered with one or two series of cells ; ter- 

 minal joint or tag trifid. 



C. TRIFIDA. 



Hab. Australia. 



II. Cells simple, disposed spirally on the articulations. Coral 

 arborescent, forked. 



4. Serialia. 



Coral arborescent, forked ; articulation elongate, naked at the tail, 

 cell-bearing above, subspiral ; terminal joint bifid. 



1. Serialia coNVOLUTA. 

 Hab. Van Diemen's Land. 



5. Spiralia. 



Coral arborescent, forked ; articulations short, covered with 



