Descriptions of Netu, or Little Known, Polyzoa. 97 



Port Phillip Heads. 



In this species the zoarium is thick, and surrounded by a 

 lamina. The cells are arranged in radiating, prominent 

 rows, from which they very slightly project. The central 

 parts of the rows consist usually of only a single series, 

 increasing towards the margin of the zoarium to two or 

 three. In some specimens there are two series almost from 

 the commencement. These series are in all cases continuous, 

 and the ridges formed by them are considerably raised, some- 

 times much more so than in the specimen figured. The 

 mouth is elliptical, and usually, except at the termination of 

 the rows, closed by a punctate membrane. I have not seen 

 any of the peculiar calyp triform covers on any of the cells, 

 such as are found in D. sarniensis. The whole surface is 

 thickly punctate, and the deep spaces between the ridges 

 transversely rugose. It is readily distinguished by the great 

 projection of the regular, radiating rows of cells. 



JDiastopora fasciculata, n. sp. Plate III, fig. 2. 



Zoarium adnate, with a distinct lamina, partly free at the 

 edges. Cells arranged in distinct, elevated, radiating ridges, 

 very much enlarged and prominent at the extremities ; the 

 narrow parts very prominent, transversely wrinkled, and 

 showing the mouths of a few closed cells, the extremities 

 forming bundles of closely packed cells, mostly opening 

 terminally. The surface between the ridges punctate and 

 transversely rugose. 



Port Phillip Heads, Mr. J. B. Wilson. 



The only specimen I have seen is the one figured. The 

 basis is a calcareous lamina, much twisted, probably from 

 the nature of the object, seemingly a friable nodule, to which 

 it was attached. The whole is irregularly divided into two 

 lobes. The cells are arranged in distinct, radiating bundles, 

 very prominent and narrow at their first portions, but 

 becoming broader and partially free at their extremities. 

 The narrow convex parts are transversely rugose, and the 

 closed orifices of a few cells can be obscurely distinguished. 

 The outer parts present the orifices of numerous, close-packed 

 cells, opening in clusters or in a vertical single or double 

 series. 



Although entirely Diastoporidan, D. fasciculata shows a 

 decided approach to the structure of Fascicidipora in the 

 distinct bundles of cells opening at the extremities. 



H 



