Tertiary Folyzoa of Victoria. 187 



Membranipopa longipes, n. sp. (PI. XXIIL, Fig. 9). 



Zoarium encrusting. Zooecia quincuncial, racquet-shaped, 

 with very long narrow pi'oximal part, surface finely granulated, 

 margins raised, smooth. Opesia subtriangular or sub-quadrate, 

 the lower margin descends rather abruptly, and there is a short 

 broad extension downwards into the cavity of the zooecium. A 

 small oval avicularium with broad mandible at the base of the 

 zooecia. 



Z(9^a////f^.-— Mornington (T. S. Hall) ; Aire Coastal Beds 

 (Messrs. Hall and Pritchard). 



The specimen figured is a single one from Mornington. 1 

 afterwards found several specimens in the Aire Coastal Beds 

 deposit. It bears a resemblance to M. cochleare (McG.), but is 

 distinguished therefrom by the very long narrow proximal 

 portion, its smooth margins, and by the presence of the avicu- 

 laria, these vary somewhat in shape ; there are three in the 

 specimen, one is quite oval, one is chlithridiate, and the other has 

 a small projection or denticle on each side. The edge broken 

 away on the right hand side shows that there are 4 " communi- 

 cation pores " on the lateral walls of the zooecia. 



Membranipora regularis, n. sp. (PI. XXIV., Fig. 10). 



Zoarium cylindrical. Zooecia elongated hexagonal, quincun- 

 cially arranged, about six in lateral series ; margins raised, 

 smooth ; area sloping downwards, granular ; opesia oval, small, 

 depressed, situated near the distal end. 



Local i ties. —MXicheW River (J. Dennant) ; Aire Coastal Beds 

 (Messrs. Hall and Pritchard). 



There were a few not very well preserved specimens in the 

 Mitchell River deposit, but it is very plentiful in the Aire 

 Coastal Beds deposit, and in a very perfect state of preservation. 

 The zooecia are remarkable for being very regular in shape. The 

 zoarium occasionally breaks up longitudinally, with two or three 

 zooecia in single series, the sides and back are thus exposed, and 

 show four " counnunication pores " on the lateral walls ; the cross 

 section is triangular, and on the internal angle are the curious 

 processes shown in figure " a" which look like small chambers, 

 two (or a double one) on the distal and one on the proximal half. 



