Descriptions of New, or Little Known, Polyzoa. 93 



straight lower lip : operculum with, on each side, a cervicorn 

 mark, and posteriorly a projecting, somewhat wedge-shaped 

 process for the attachment of the occlusor muscles. Avicu- 

 larium very large, replacing a cell ; mandible of great size, 

 nearly semicircular. Ovarian cells rounded above, narrowed 

 below ; the pore semilunar, at the extreme upper end of the 

 cell, with the lower edge usually projecting and smooth or 

 obscurely crenulate. 



Port Phillip Heads, mostly on Dictyopora. 



This fine species forms tufts 1 to 3 inches high. The 

 articulations are frequently rigid from calcification. The 

 internodes are thick, and usually slightly curved. The cells 

 are nearly regularly rhomboidal; the ovarian cells broad, 

 and rounded above, and narrowed below. The mouth is 

 situated in the upper half, the lower lip corresponding to 

 about the middle of the cell ; deep in the interior are two 

 sharp, stout, calcareous denticles from each of the upper and 

 lower margins, directed vertically upwards and downwards, 

 The operculum is very peculiar. It has a large cervicorn 

 mark on each side, and the occlusor muscles are attached to 

 projecting, wedge-shaped processes. The avicularium is of 

 great size, replacing a cell : the upper margin projects much 

 forwards, and the mandible is very large, nearly semicircular, 

 and directed upwards. The ovarian pores are mostly semi- 

 lunar, situated close to the Ripper margin of the cell, and 

 about the same width as the mouth : the lower edge projects 

 upwards as a sort of lip, which is either smooth or very 

 faintly crenulate. 



Cellaricc Austral is. 



When I first described this form in Decade Y. of M'Coy's 



Prodr oralis, I had not had an opportunity- of examining 

 specimens of the European C. nstulosa, and somewhat 

 doubtfully considered it as a variety of that species. After 

 examination of specimens kindly sent by Mr. Waters and 

 Mr. Hincks, I am now quite satisfied that the present is a 

 totally distinct species, and Mr. Hincks is inclined to the 

 same opinion (Ann. and Hag. J at. Hist., May, 1884). The 

 mode of growth is quite different. All the other Cellar ice 

 with which I am acquainted are regularly, dichotomously 

 branched, while in C. Australia the branches arise by 

 corneous tubes from the surface of cells (or spaces repre- 

 senting cells), from the sides of the parent branches, and 

 not from the extremities. Frequently three or four spring 



