On the Australian Species of Amathia. 139 



I regret that I unfortunately overlooked Mr. Goldstein's 

 excellent description and figure when previously descx'ibing this 

 species. 



13. A. WiLSONi, Kirkpatrick. 



(Plate D., Fig. 2.) 



Amathia IVilsoni, Kirkpatrick, Ann. and Mag. Nat. Hist., 

 July, 1888. 



Zoarium irregularly branched, of a light brown coloux'. 

 Main stems having in front a biserial cluster of 6-9 pairs 

 of zooecia occupying the upper part of each internode ; at 

 each joint giving off three branches, two lateral and one smaller 

 posterior ; the lateral branches divided into (usually) three 

 internodes ; the first two internodes almost entirely occupied by 

 a continuous double row of 7-12 pairs of zooecia and giving off 

 at the joints two aborted branches ; the third internode smaller, 

 with the zooecia less distinct and terminated by three abortive 

 l^ranches or plumose processes which are thick, glassy, divided 

 into two or three internodes and at each joint give off a short 

 pointed process. The posterior branches from the main stem 

 consisting of a single celliferous internode terminated by three 

 abortive branchlets. 



Port Philip Heads, Mr. J. Bracebridge Wilson. Encounter 

 Bay, S.A. 



This beautiful species cannot be confounded with any other. 

 The lateral branches turned forwards and arching inwards, with 

 the glassy abortive branchlets, give the whole a very elegant 

 plumose appearance. The zooecia are of considerable length and 

 closely connate. The abortive branchlets, as in fact are also the 

 main stems and other internodes, are hyaline and subtransparent. 



14. A. PLUMOSA, MacGillivray. 



(Plate C, Fig. 2.) 



Amathia plumosa, MacGillivray, Proc. Roy. Soc, Victoria, 

 November, 1889. 



Zoarium forming large tufts. Primai-y branches cylindrical, 

 divided regularly by partitions or joints, destitute of zooecia. 

 Secondary branches given off" at the joints in regular diverging 



k2 



