292 Descriptions of New, 



From the main branches others spread on each side, nearly 

 at right angles, in a penniform manner, and these again give 

 origin to still smaller branches; these anastomose irregularly 

 together, and the large branches from the neighbouring main 

 stems frequently unite in the same way. Some specimens 

 consist only of a single stem with lateral branches, frequently 

 not so regular, while in others these stems are still more 

 numerous. The resulting polyzoary in those with several 

 stems is more or less expanded and curled. The anastomoses 

 of the branches and branchlets are very irregular, being 

 absent in some specimens, while in others they are very 

 numerous. There is nothing like the regular fenestrate 

 arrangement, which is seen in Retihornera foliacea. 



Pustulopera regularis, i\. sp. Fig. 3. 



Polyzoary dichotomously branched. Cells arranged in 

 nearly regular sub-spiral series, projecting above, indistinct 

 below; mouth rounded, directed forwards; surface sub- 

 granular. 



Port Phillip Heads. 



I have only examined two specimens, the larger the one 

 figured. The cells follow more or less spiral lines in both 

 directions, so as to result in a nearly quincuncial arrange- 

 ment. The upper part is prominent, the lower indistinct. 

 The mouth is nearly circular, and the peristome sometimes 

 produced into a very short tube. 



It is closely allied to some of D'Orbigny's fossil species, and 

 may prove to be identical with his Entalophora suib- 

 regularis. 



Fasciculipora gracilis, n. sp. Fig. 2. 



Cells very long ; arranged in flattened bundles, the upper 

 parts usually distinct and free ; surface thickly punctate. 



Port Phillip Heads. 



The specimen, of which a portion is figured, grows on a 

 small specimen of Retepora aurantiaca. There are two 

 groups springing from the same calcareous basis. The cells 

 are arranged in flat fasciculi, closely bound together at their 

 bases, but at the summit separating into smaller bundles, 

 or being each distinct and considerably projecting. The 

 whole surface, including part of the free portions, is thickly 



