98 Canon A, M. Novman — Notes on tlie 



seems to prove that tlicy are of cliitinous strncturc^ -wliicli 

 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 zooeciura " (' Floridan Bryozoa/ pt. ii. 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 throAving further light upon them. These 

 organs are not confined to radiata and its variety innominata ; 

 they are present also in M. Gattya, 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 papillae themselves in radiata 

 and its variety and the frontal pair only in Gattyce. 



Gutty te. — The figure given (PI. 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. 5 

 is taken from a form encrusting a shell taken in Guernsey. 

 In this the papilke-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 Gattyce. It may prove to be a distinct 

 species. 



Bahaci (Audouin), Waters, = cribrosa, Waters olini, from 

 Madeira (PI. IX. fig. 6;, has usually only one large lacune 

 on the marginal line and some minute lacunes round the 

 middle. 



Figulma (PL IX. fig. 7) has a very simple structure. A 

 row of comparatively small lacunes occupies the lateral line 

 and runs right up to the median line, and there is a total 

 absence of median lacunes. The lumeu-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 jiore as exterior to the Cribri- 

 Imidan system, and in the place of the papillse-poi'cs of 

 radiata, and I think that I have done right in doing 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 



