A MONOGRAPH OF THE TERTIARY POLYZOA OF VICTORIA. 131 



entire ; surface of zocecia and intervening spaces finely granular or transversely 

 corrugated. Oceciurn a distinct, rounded inflation of the zoarium, closely punctate. 



M.C. Living. Victoria. 



3. D. recta, n.sp. PL XX., fig. 6. 



Zoarium adnate. Zocecia indistinct, except at the extreme anterior extremities, 

 which are turned directly forwards ; thyrostome circular, with a thick peristome ; 

 surface of zoarium and zocecia granular, finely corrugated. 



M. 



Distinguished hy the total ohi iteration of the junction of the zooecia except at 

 the anterior extremities, which are turned forwards, which, with the peristomes, 

 seem to rise abruptly from a continuous, finely-granular and faintly rugose surface. 



4. D. torquata, Kirkp. PL XX., fig. 7. 



Bidiastopora torquata, Kirkp., A.M.N.H., 6, II., 15. 



Of this the only specimen I have is the extremity of the branch figured. It is 

 narrow and consists of two layers of zooecia placed back to back ; the zooecia are 

 distinct, very long and narrow, closely connate except at the extremities, which 

 are free, abruptly curved forwards and project as long pcristomial tubes ; the 

 decumbent portions are closely and distinctly punctate, the erect parts smooth and 

 glossy or finely-ringed ; the peristomial opening circular and entire. 



M.C. Living. Victoria. 



I have beautiful recent sj)ecimens from Mr. Wilson dredged at Port Phillip 

 Heads, shewing the whole structure of the species. In these the branches rise from 

 an expanded, crustaceous, discoidal base, and are in reality formed by a double layer 

 of zooecia. D'Orbigny introduced the genus Bidiastopora for those Diastopores 

 forming narrow bilaminate branches, in the same way as Blainville's Meseateripora 

 includes the bilaminate foliaceous forms. These distinctions, however, cannot be 

 considered of generic value, and the species so constituted can at most only be 

 referred to sub-genera. Two species of the latter form, J), capltata and lustata, the 

 former really intermediate between the sub-genera, occur living at Port Phillip 

 Heads. 



Liripora, Mb G. 



1. L. bicolor, McG. PL XX., fig. 8. 

 (For description see Appendix.) 



S2 



