BY R. VON LENDENFELD, PH.D. 613 



III. SUBORDER HYDROCORALLIN^E. 



Moseley. 



ALIMENTARY ZOOIDS WITH FEW VERTICILLATE, CAPITATE 

 TENTACLES. HYDRORHIZA FORMING A DENSE CALCAREOUS 

 SKELETON WHICH ALSO INVESTS THE POLYPES. GROUPS 

 OF MACHOPOLYPES, IN THE FORM OF TENTACULAR ZOOIDS, 

 SURROUND THE ALIMENTARY POLYPES. 



Ultimately generative Zooids are probably Medusae. 



14. FAMILY. STROM ATOPORIDyE. Murie and Nicholson. 



Possessing undulating laminae in the skeleton. 

 No Australian representatives are known of this extinct family 

 of the Hydrocorallina?. 



15. FAMILY. MILLEPORID^E. Mosely. 



Alimentary Zooids, with from 4 to 6 tentacles. Polypary with 

 many conic spaces, divided by Tabular. Coenenchym with reticu- 

 lating canals. 



Dactylozooids, with numerous tentacles. Ampulla? absent. 



61. GENUS MILLEPORA. Mosely. 



The calcareous skeleton attains different shapes. The colonies 

 have an uneven surface. In the centre of each irregular group of 

 Dactylozooids one Alimentary Zooid. 



217. MILLEPORA TORTUOSA. Dana. 

 This species was dredged off Fiji, and described by Dana (1). 



(1) Dana. United States Exploring Expedition, Zoophyta, Phila 1S46, 

 p. 545. 



