80 Proceedings of the Royal Society of Victoria. 



the zocecia in that form are very much larger and more 

 regular, and I think that on the whole they ought to be 

 retained as distinct species. 



MlCROPORA ABYSSICOLA, Smitt sp., PI. IX, Fig 4. 



Zoarium encrusting. Zooecia large, more or less hexagonal, 

 much depressed, separated by raised granular margins ; 

 surface granular ; aperture (fully formed) arched above, 

 straight below or slightly bulging upwards, with thickened 

 margins, entirely occupied by the operculum. Avicularian 

 cells interspersed among the others, smaller, with the anterior 

 extremity sharply pointed ; in the centre, a large somewhat 

 elliptical aperture, covered by a thin membrane, and having 

 articulated at its anterior end a very long setiform mandible, 

 part of which is fringed by a membranous expansion on both 

 sides. 



North Western Australia, on pearl shell, Mr. W. H. 

 Wooster. 



This has already been described by Hincks (Ann. and Mag. 

 Nat. Hist., February 1S81), from Cuba, and considered as 

 the Membraniporidan form of Smitt's Vincularia abyssicola 

 (Floridan Bryozoa), an indication which I think is correct. 

 In my specimen, however, the front of the cells is more 

 depressed and more gi-anular than in Smitt's and Hincks' 

 figures. Smitt also describes a thick ectocyst. In one of 

 the zooecia, where calcification is not complete, it will be seen 

 that the opercular flap is distinct in the inner membrane, 

 which is exposed for a short distance downwards. 



The genus A^incularia is one which, so far as I can .see, 

 ought not to be retained. It contains a heterogeneous 

 collection, chiefly fossil, of species agreeing only in the erect 

 cylindrical mode of growth. The majority of the species 

 ought to be referred to Membranipora or Biflustra. Among 

 the tertiary Polyzoa of Victoria, species of Membranipora, 

 Biflustra, Cribrilina, Schizoporella, and Lepralia, are 

 remarkable for occurring in the Vincularia form, and in fact 

 form a striking feature of that fauna. 



Lepralia lateralis, n. sp., PI. X, Fig. 3. 



Zoarium encrusting. Zooecia very large, distinct, ovate, 

 convex, surface tubercular and pitted, except in a narrow 

 space below the mouth ; mouth lofty, arched above, 

 contracted at the lower third, peristome thickened and 



