Zoologi,.] NATURAL HISTORY OF VICTORIA. [Polyzoa. 



Port Phillip Heads. 



In this species the zocecia are much wider above, contracting 

 below. There is frequently, but not always, an incurved spine 

 on each side towards the lower part. The front of the zooecium 

 is obscurely divided into three parts : the central, the same width 

 as the mouth, is faintly lined transversely at its upper part ; the 

 two lateral, immediately below or opposite the mouth, give origin 

 to a process terminating in a chitinous spine. 



I "have examined only a few dried specimens, and from these 

 it is impossible to say whether there is any real division of the 

 body-cavity. Mr. Hincks describes and figures the oral uncinate 

 spines as arising from sack-like structures, but the appearance is 

 probably owing to his having examined old, dried and shrivelled 

 specimens. The minute disks on the fi'ont of the zooecia mentioned 

 by him also only occur in old specimens, and are similar to the 

 markings seen under similar circumstances in many other polyzoa. 



Explanation of Figtiees. 



Plate 158. — Fig. 2, specimen natural size. Fig. 2a, portion of same, magnified. Fig. 3, 

 portion of branch of another specimen. Fig. 4, two zooecia, the upper surmounted by an 

 ooBcium. 



Plate 158, Fia. 5. 

 FARCIMINARIA SIMPLEX (McG.). 



Description. — Zooecia much elongated, narrow, but wider above, separated by 

 raised, slightly crenulated, or smooth margins ; no spines nor avicularia. Ooecia very 

 large. 



Reference. — P. H. MacGillivray, Tr. Roy. See. Vict., Nov. 1885. 



Port Phillip Heads. 



This species differs from the others in the absence of avicularia 

 and of spines or processes of any sort on the separating margins 

 of the zooecia. The ooecium is of great size. It is smooth, 



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