Tertiary Polyzoa of Victoria. 185 



almost in a continuous cui've, angle only just perceptible ; 

 surface sunken and granular. Thyrostome arched above, nearly 

 straight below ; mai-gins raised, a broad narrow plate inside 

 lower margin, and a thick broad process depending from the 

 inside of the upper margin. 



Locality. — Mitchell River (J. Dennant). 



This I place in Cella?ia on account of the plates projecting 

 internally from the upper and lower margins of the thyrostome ; 

 had not these been present I would have placed it in Macropora. 

 One specimen shows that it probably branched dichotomously. 



Membranipopa bell is, n. sjd. (PI. XXIII., Fig. 5). 



Zoarium encrusting. Zooecia oval, with narrow raised margins, 

 upper margin incurved; several (6'10) irregular, more or less 

 branched spines on upper margin. A large capitate avicularium 

 on one side of the zooecia with a large boat-shaped base, or cell, 

 which bears upon the outer sui'face tubercles and spines. 



Locality. — Lower beds. Muddy Creek (J. Dennant). 



This species resembles M. interi/iedia (Kirkpatrick), as the 

 avicularia are covered with tubercles, but the shape of the 

 zooecium is different, the upper margin being incurved, the 

 number of spines on the upper margin is greater, being from 

 6 to 10 instead of 2 ; the avicularia are difterent, being directed 

 upwards, bearing short spines as well as tubercles, and not having 

 a branching spine growing out of the lower portion. 



Membranipora globulosa, n. sp. (PI. XXIII., Fig. 6). 



Zoarium encrusting. Zooecia irregularly oval, with narrow 

 raised margins. Two spines on the distal end with a branching 

 spine on one side directed downwards over the aperture Avicu- 

 laria opening upwards, with a branching spine directed upwards 

 from the surface, margins of mandibular chamber raised, outside 

 smooth. Ooecia globose, wider than high, covered with small 

 tubercles. 



Locality. — Lower beds. Muddy Creek (J. Dennant). 



This is very near M. intermedia, but the avicularia face 

 upwards and the outside is smooth. 



