2 Proceedings of the Royal Society of Victoria. 



Locality. — Mitchell River (J. Dennant). 



This is near M. geinmata, but it is much more delicate ; the 

 margins ai"e not so thick as in that species and there is no trace 

 of a "sloping plate " in the distal end of the zooecia. 



Membpanipora morningtoniensis, n. sp. (PL I., Fig. 4). 



Zooecia oval ; area very large ; margin raised, with six (or 

 more) irregularly branched spines at the distal end. 



Locality.— yioxnm^tow (T. S. Hall). 



I have found only the small fragment figured, in which there 

 is but one zooecium at all perfect (a small portion of the margin 

 on the left hand side is broken away), but the numerous irregu- 

 larly shaped spines at the distal end show it to be quite distinct 

 from any other species. 



Membranipopa dennanti, n. sp. (PL I., Fig. 5). 



Zoarium encrusting. Zooecia irregularly oval ; area subtri- 

 angular, or subquadrangular, with the angles rounded ; avicularia 

 large, mandible long, acute, slightly curved ; a large perforation 

 or open space above. Ooecia globose, with a faintly marked 

 frontal area. 



Locality. — Mitchell River (J. Dennant). 



This belongs to the '■'■ fleiningii'''' group. The perforation or 

 uncovered space in the cell wall above the avicularium is a very 

 peculiar feature, but is said by Mr. Waters^ to occur in M. curvi- 

 rostris and M. permunita. 



Membranipopa incupvata, n. sp. (PL I., Fig. 6). 



Zoarium encrusting. Zooecia irregularly hexagonal, very flat, 

 margins sulcate ; area oval, large, surrounded by a narrow 

 mamillated border, which incurves near the distal end. 



Z^ra/Z/j'.— Fyansford (T. S. Hall). 



The single specimen figured. The zooecia are large and very 

 flat. The small elliptical prolongation of the area distally formed 

 by the incurved margin is peculiar, and may possibly represent 

 ooecia broken away, but there is no trace of an ooecial cell in the 

 cavity, the dorsal wall is quite smooth internally. 



1 Linn. Soc. Journ., 1898, p. 684. 



