46 Neio Species of Bryozoa from the Marion Islands, Sc. 



transverse section of the zoarium shows two or three internal 

 longitudinal chambers. Branches disposed in the same plane. 

 I would not be surprised to find that I have failed to 

 diagnose this form correctly, but I give it just as it appears, 

 so as to direct the attention of other observers to it. 



Note on Bicellaria grandis (Busk). 



In describing this species from Bass's Straits, Mr. Busk 

 mentions 2-5 submarginal spines and a single dorsal spine ; 

 my specimens frequently show three dorsal spines, as now 

 figured. The fine pedunculate avicularium is often abun- 

 dant on some specimens. It is attached to the back of a 

 cell by a very short peduncle, and widens rapidly upwards, 

 the top oval and flat, occupied by a large mandible, which 

 closes into a strong hooked beak on the outer side ; the 

 large retractor muscles, springing from near the centre of 

 the mandible, diverge below and fill the whole lower portion 

 of the avicularian chamber. 



The ovicell is globular, covering the upper portion of the 

 cell on which it is placed, and is open and arched below just 

 over the cell mouth, where it is strengthened by a transverse 

 band. The front is prettily marked by lines radiating 

 upwards from a slight fissure near the centre of the arched 

 band. There is a slight space between the outer and inner 

 walls, and it is the inner wall that is ornamented. A long 

 tubular process extends from the lower and inner side of 

 the ovicell, obliquely down the back of the cell on which it 

 is placed, and is then attached by a ringed process to the 

 tubular stem of the next cell above. 



This mode of attachment, or anchoring, of the ovicell sug- 

 gests a curious problem — By what means does the ovicell 

 send down this tubular process, and how does it attach 

 itself to the neighbouring cell % Would it not appear that 

 the anchoring stem, or peduncle, must have within its walls 

 some active vital principle, having a discriminative power, 

 or instinct — some prolongation from the body of the parent 

 zooid somewhat similar to the cgenosarc of the Hydroida ? 

 Another curious fact to be noted is that the ovicelligerous 

 cells are generally twisted out of the normal shape. This 

 species is common on the southern coast of Australia. 



