98 Canon A. M. Norman—WNotes on the 
seems to prove that they are of chitinous structure, which 
does not militate against the view entertained of them by 
Smitt, who, writing of what he termed the “ pair of movable 
bristles,” says: “as to their use, they seem to represent sensorial 
vibracula. Very often they are laid down along the side 
of the zocecium” (‘ Floridan Bryozoa,’ pt. 11. 1873, p. 22). . 
They, at any rate, appear to be entirely independent struc- 
tures ; and I trust that Dr. Harmer may have an opportunity 
before long of throwing further light upon them. These 
organs are not confined to radiata and its variety innominata ; 
they are present also in M. Gattye, and also in figulina, where 
they are represented in a similar position between the loops 
of the bars by small slits; but though I have seen these 
openings, I have only seen the papille themselves in radiata 
and its variety and the frontal pair only in Gattye. 
Gattye—The figure given (Pl. IX. fig. 4) will by itself, 
after what has been already written, explain the structure in 
the form which is usually found on red seaweed. PI. IX. fig. 9 
is taken from a form encrusting a shell taken in Guernsey. 
In this the papille-holes can be made out down the sides, 
while in the red weed specimen it was only the first which I 
could distinguish plainly. The former has a remarkable 
peculiarity, the minute lacunes on the marginal line are in 
pairs, which is a unique feature; the margin of each bar 
appears to make a loop and then the interval between 
them is filled in. The number of lacunes from the margin to 
the centre is, moreover, double that of the other and more 
usual form of Gattye. It may prove to be a distinct 
species. 
Balzaci (Audouin), Waters,= cribrosa, Waters olim, from 
Madeira (Pl. IX. fig. 6), has usually only one large lacune 
on the marginal line and some minute lacunes round the 
middle. 
Figulina (Pl. IX. fig. 7) has a very simple structure. A 
row of comparatively small lacunes occupies the lateral line 
aud runs right up to the median line, and there is a total 
absence of median lacunes. The lumen-line has a remarkably 
large pore in the loop, and between these large pores and a 
little exterior to them there is a small, elongated, narrow 
pore. I have figured this last pore as exterior to the Cribri- 
linidan system, and in the place of the papille-pores of 
radiata, and I think that I have done right in domg so; but 
I do not feel quite certain upon the point, the thickness of the 
shell in this species makes it difficult to trace the exact out- 
line of the loops of the bars ; but, as well as I have been able 
