96 Canon A. M. Norman—WNotes on the 
and as the posterior rows never have so many lacunes, four- 
teen may be considered the usual full number. 
Radiata and the species or variety innominata (Pl. IX. fig. 3, 
innominata).—In these forms the bars in the youngest state 
have a pore in the loop, but soon afterwards the lumen-line 
is raised into a more or less prominent ridge, and the pore is 
commonly obliterated. The lateral lacunes are generally 
three or four in number: there are usually no median lacunes, 
their place being occupied by a longitudinal central rib, 
which is evident at an early stage of development, and to the 
sides of which the lumen-ribs commonly afterwards unite 
themselves. The oral opening is formed much in the same 
way as in nitido-punctata, but in a more simple manner: the 
lower bar does not fork as in that species, but its front margin 
is outspread at the sides until it unites with the oral bar, but 
leaves in the middle a single large lacune. The form radiata 
differs from the innominata which I have just described in 
having more numerous bars, more numerous lacunes, with a 
few median lacunes occasionally to be seen; the lumen-ribs are 
only slight, the longitudinal rib seldom developed. The junc- 
tion of the oral and suboral ribs, instead of leaving only one 
large central lacune, is indicated by from one to seven lacunes ; 
though it is seldom that the number 1s confined to the single 
lacune characteristic of innominata, and I have only seen such 
instances of single lacunes in this position in the case of a 
zocecium here and there in a zoarium. The radiata forms 
which I have examined are from Birturbuy Bay, Ireland, 
Guernsey, Naples, and Madeira. A very beautiful form of 
the variety innominata occurs at Guernsey, all the ribs are 
very much raised, the central longitudinal rib rises in front to 
a much elevated process ; but the chief peculiarity consists 
in spine-formed hollow processes which rise above the base 
of the lumen-ribs just over the place where in the young is 
seen the lumen-pore, and from which they doubtless take 
their origin. I have now described the ordinary cribriline 
structure in these two forms. But an entirely new feature 
appears here. Hincks described a “very delicate setiform 
appendage”’ as developed on each side of the lower margin 
of the orifice, and in his description of the plate called these 
organs “ vibraculoid sete.” Dr. Harmer has recently (“ On 
the Morphology of the Cheilostoma,” Quart. Journ. Micr. 
Sci. vol. xlvi. n. s. 1902, p. 326, pl. xv. fig. 7) traced the 
matter further, and found these appendages in reduced size 
present also at regular intervals along the side of the zocecium. 
Dr. Harmer is of opinion that they not only represent 
the spines of the ancestrula, which he figures, and that “ the 
