Zoology.-] NATURAL HISTORY OF VICTORIA. IPoli/soa. 



Port Phillip Heads. 



This species occurs in tufts several- inches in height. The 

 zooecia form a continuous spiral round the branches, interrupted 

 only at the bifurcations. They are separated by deep grooves, 

 but in dried specimens, as in that figured, they become depressed 

 and the partitions appear as prominent ridges. The united 

 separating walls of contiguous zocecia project upwards as blunt 

 points (more prominent when dried). It is at once distinguished 

 from the other species, by its stoutness, the uniform length of 

 the zooecia and the closeness of the spiral entirely concealing 

 the branches except at the bifurcations. There can be no doubt 

 that this is Lamouroux's species. That described and figured by 

 Busk as A. spiralis in the " Cliallenger" Polyzoa is quite different. 



Explanation of Figures. 

 Plate 185. — Fig, 2, branch, natural size. Fig. 2a, portion of same (dried), magnified. 



Plate 185, Fm. 3. 

 AMATHIA TORTUOSA (Tenison-Woods). 



Description. — Zoarium slender, stragg-ling, of a dull olive colour; branches 

 clear and glassy. Zocecia slender, of moderate height, arranged in long spiral 

 clusters extending from two-thirds to more than a complete turn round the axis, and 

 leaving a clear space at the base of the internode. 



References. — A. tortuosa, Tenison-Woods, Tr. Roy. Soc. Vict., 1879. 

 A. connexa, Busk, '^Challenger" Polyzoa, pt. ii., p. 36, pi. vi., fig 3. 



Port Phillip Heads ; Sealers' Cove, Baron von Mueller. 



I believe that this is the species intended by Mr. Woods, 

 although it does not quite agree with his figure and description. 

 Mr. Busk, however, was doubtful as to the identification and 

 named this A. connexa, considering another allied species, which he 

 describes and figures, to be the true A. tortuosa. 



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