94 Canon A. M. Norman — Notes on the 



British forms of this species, as will be seen by reference to 

 the figures of Hincks (pi. 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. spitsheryensis (PI. VIII. fig. 11). — Here the 

 bars are closely consolidated together, the elevated ril)s 

 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, b}^ their joint partici[)ation in the 

 manner which has been already described. 



Nitido-jmnctata (Smitt) (Pi. VIII. 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. 13, which represents some bars 

 in the middle of the zooecium) are at first narrow and widely 

 separated, so that, instead of ordinary lacunes, there are 

 entirely open spaces between them ; at about three-fifths of 

 the distance to the middle line the bar widens and formshaif 

 an arch on each side to be met by half an arch from the 

 neighbouring bar to complete its formation at h and c, from 

 the points indicated by these letters the bar is projected 

 straight forward until it meets the median line of the zooecium 

 d, forming on its w^ay, with the assistance of the adjoining 

 bar, a lacune ; the figure given represents a pair of completed 

 lacunes, whicli 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 zooecium, 

 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 zooecium, that these were median lacunes, 

 but that is not so — they are lateral lacunes, horizontallj'^ 

 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 zooecium, 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 outs})rea(l l)ars h 

 are attached, forming in fiont the lower lip of the oral 



