Akt. XVI r. — Sfi/lasteridw front the Victor tan 

 Terti(ir'(('s. 



By T. S. Hall, M.A. 



(Demonstrator and Assistant-Lecturer in Biolog-y in the University of 



Melbourne). 



[Rea.l 11th Novemljer, 1S97.] 



In a previous volume of the Proceedings I noted the presence 

 ■of Stylasterida" in our tertiaries, and described two new genera 

 and species. •" One of the&e Lepfobot/iriis s/^eiicei-i, &^ pointed out 

 by the late Dr. P. H. Macgillivray,''^ proves to be a polyzoon, 

 Porina gracilis. Of the other form, numerous examples have now 

 occurred to me, and are dealt with below. The presence of two 

 other genera, Distichopora and Spo7-adopora is noted, the latter 

 being represented by what appears to be the recent species S. 

 dichotoma. 



Deontopora, T. 8. Hall. 



This genus was founded on a single well preserved specimen.'^ 

 Since then several other examples from our Eocene beds have 

 come under my notice, and I obtained a very large number from 

 the Miocene sands of the Grange Burn near Hamilton. An exami- 

 nation of these specimens throws some additional light on the 

 structure of the corallum and on the affinities of the genus. 



In the younger parts of the brandies the cyclosystems are 

 arranged in such a way that a zigzag form is produced, but this 

 feature soon disappears with advancing age. The terminal cyclo- 

 system of a brancli, from which the succeeding systems are 

 produced, has the dactylopores arranged in a complete ring round 

 the gastropore, and the same cliaracter may be found in one, or 

 perhaps two, of the next older systems. As growth jjroceeds. 



1 Proc. Roy. Soc. Vic1-., v., N.S., 1S93, p. 117. 



2 Trans. Roy. Soc. Vict, iv., 1895, p. 103. 



3 Proc. Roy. Soc. Vict., v., N.S., 1893, p. 117. 



