116 Descriptions of New, or Little Known, Polyzoa. 



a small one. with a semicircular mandible below or to one side 

 of the month. Ovicell not prominent, granular, or pitted. 



Port Phillip Heads. 



Forms a large, encrusting zoarium, one specimen mea- 

 suring 2 inches by 1J inches. The marginal cells, as usual 

 in the CelleporcB, are decumbent, and I believe it was a 

 cluster of these that I described previously as Lepralia 

 meg o. soma. The others are elevated in various degrees. 

 There is no distinct mucro. The surface of the cells is 

 normally smooth, but in portion of one specimen, in which 

 most are so, a number have a series of longitudinal, elevated 

 ribs extending the whole length. The markings on the 

 ovicells are convex, but become worn off, and then appear as 

 pits. It forms a transition between the genera Schizoporella 

 and Cellepora. 



Gellepora rota, n. sp. Plate III, fig. 6. 



Zoarium encrusting. Cells irregularly arranged, nearly 

 erect, more or less globose. Mouth -with a deep sinus in the 

 lower lip ; an elevated process, surmounted by a short, broad 

 avicularium on each side, the mandible broadly triangular, 

 with an obtuse point ; surface smooth or pitted. Ovicells 

 much raised, with a nearly circular, defined area, marked by 

 radiating grooves. 



Port Phillip Heads. 



The cells are very distinct, the old ones nearly globular, 

 and looking directly upwards. The peristome forms a 

 narrow rim with a prominence on each side, on the summit 

 of which is a short, broad avicularium, with the mandible 

 pointed upwards and outwards. My specimens have no 

 avicularia except those at the sides of the mouth. 



Family Tubulipoehle. 

 TubuUpora ludda, n. sp. Plate Y. } fig. 1. 



Zoarium small, flabelliform... Cells mostly distinct, arranged 

 in irregular rows, smooth and glistening : peristome long, 

 tubular, white, with a nearly circular mouth. Ovicells large 

 inflations, pierced by numerous cells, thickly covered with 

 white-bordered pores. 



Port Phillip Heads ; Portland, Mr. Maplestone. 



I have seen several specimens of this species, the most 

 perfect being that figured, Vfliich was found at Portland by 



