Art. IX. — On the Australian Species of Aniathia. 

 By P. H. MacGillivray, M.A., LL.D., M.R.C.S., F.L.S. 



[Eead 12th July, 1894.] 



Several species of Amathia have long been known to occur on 

 the Australian coasts, and were described by Lamouroux and 

 Lamarck. Of late years several others have been added to the 

 list. A great deal of confusion, however, exists as to what these 

 species really are. This has been partly owing to the imper- 

 fection of the descriptions, and in some cases to the want of 

 figures. 



In the present paper I give descriptions and figures of all those 

 with which I am acquainted, by which I trust that Australian 

 observers will have no difficulty in identifying the species. No 

 doubt others will be discovered, especially from New South 

 Wales, Queensland and Nortliern Australia, from which my 

 materials are very scanty. 



Amathia, Lamouroux. 

 (= Serialaria, Lamarck.) 



Class, Polyzoa. Division Ectoprocta. Order Infundibulata. 

 Sub-order Ctenostomata. Family Vesiculariidpe. 



Generic character. — Zoarium radicate, with free, filiform, 

 usually dichotomous bi'anches, divided by more or less distinct 

 joints or partitions. Zoa3cia sub-tuljular, occasionally in one, 

 but mostly in two, parallel rows, in continuous series or in 

 distinct groups, which are placed on one, or rarely on two, sides 

 of the bi'anches, or are wound spii-ally partially or wholly round 

 them. 



* Zocecia forming a continuous or interrupted spiral. 



1. A. SPIRALIS, Lamouroux. 

 (Plate A., Fig. 1.) 

 Amathia spiralis., Lamouroux, Hist, des Polypiers Coralligenes 

 Flexibles, p. 161, pi. iv., fig. 2 ; Expos. Methodique des Genres 



