94 Canon A. M. Norman—Notes on the 
British forms of this species, as will be seen by reference to 
the figures of Hincks (pl. xxv. figs. 11, 12), come much nearer 
to the following Arctic variety, except as regards certain 
points which will be referred to when I come to describe that 
variety. - 
Annulata, var. spitsbergensis (Pl. VIII. fig. 11).— Here the 
bars are closely consolidated together, the elevated ribs 
indicate the bars, and along their middle a faint line may be 
noticed with occasionally a very minute pore which makes 
known the existence of the lumen below; lines of lateral 
lacunes occupy the junction of the two adjacent bars, and 
are formed, as always, by their joint participation in the 
manner which has been already described. 
Nitido-punctata (Smitt) (P). VILI. figs. 12, 13).—This beau- 
tiful species possesses some very distinctive characters and 
variations from the more normal forms, which are of much 
interest. The bars (see fig. 18, which represents some bars 
in the middle of the zocecium) are at first narrow and widely 
separated, so that, instead of ordimary lacunes, there are 
entirely open spaces between them; at about three-fifths of 
the distance to the middle line the bar widens and forms half 
an arch on each side to be met by half an arch from the 
neighbouring bar to complete its formation at 6 and c, from 
the points indicated by these letters the bar is projected 
straight forward until it meets the median line of the zocecium 
d, forming on its way, with the assistance of the adjoining 
bar, a lacune ; the figure given represents a pair of completed 
lacunes, which are divided by the median line, and belong 
the one to two bars proceeding from the left, and the other 
from two bars proceeding from the right side of the zocecium, 
and below these is seen a pair not fully formed. It might 
have been supposed, at first sight of their position in the 
middle of the zocecium, that these were median lacunes, 
but that is not so—they are lateral lacunes, horizontally 
divided. A line is over the lumen at a, and has usually two 
small pores, one of which is in the loop and the other beyond 
the division into the half-arches. Fig. 12 represents the 
building up of the bridge and the oral lip. The bar a bifur- 
cates and the lumen shares the bifurcation and has three 
pores, one at the base in the loop and the other at the end 
of the lumen in each branch of the fork ; the lower branch of 
the fork is on the same level as the rest of the zocecium, the 
upper branch of the opposite bars is projected upwards and 
outwards, and joining leave below them a large open foramen, 
which they overhang, and on them the solid outspread bars 6 
are attached, forming in front the lower lip of the oral 
